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Cisco IOS Data-link Switching Bug Lets Remote Users Deny Service
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SecurityTracker Alert ID: 1019712
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SecurityTracker URL: http://securitytracker.com/id?1019712
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CVE Reference: CVE-2008-1152
(Links to External Site)
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Date: Mar 26 2008
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Impact: Denial of service via network
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Fix Available: Yes
Vendor Confirmed: Yes
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Advisory: Cisco Security Advisory
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Description: A vulnerability was reported in Cisco IOS in the processing of Data-link switching (DLSw) packets. A remote user can cause denial of service conditions.
A remote user can send a specially crafted UDP packet to UDP port 2067 or IP Protocol 91 packet to trigger a memory leak on the target
device or cause the target device to reload
Cisco IOS devices that are configured for DLSw Fast Sequenced Transport (FST) are
affected.
Cisco has assigned Cisco Bug ID CSCsk73104 to this vulnerability.
|
Impact: A remote user can cause denial of service conditions.
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Solution: The vendor has issued a fix. A patch matrix is available in the vendor's advisory.
The vendor's advisory is available at:
http://www.cisco.com/warp/public/707/cisco-sa-20080326-dlsw.shtml
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Vendor URL: www.cisco.com/warp/public/707/cisco-sa-20080326-dlsw.shtml (Links to External Site)
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Cause: Not specified
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Reported By: Cisco Systems Product Security Incident Response Team <psirt@cisco.com>
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Message History:
None.
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Source Message Contents
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Date: Wed, 26 Mar 2008 17:00:00 +0100
From: Cisco Systems Product Security Incident Response Team <psirt@cisco.com>
Subject: Cisco Security Advisory: Multiple DLSw Denial of Service
|
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
Cisco Security Advisory: Multiple DLSw Denial of Service
Vulnerabilities in Cisco IOS
Advisory ID: cisco-sa-20080326-dlsw
http://www.cisco.com/warp/public/707/cisco-sa-20080326-dlsw.shtml
Revision 1.0
For Public Release 2008 March 26 1600 UTC (GMT)
Summary
=======
Cisco IOS contains multiple vulnerabilities in the Data-link
Switching (DLSw) feature that may result in a reload or memory leaks
when processing specially crafted UDP or IP Protocol 91 packets.
Cisco has released free software updates that address these
vulnerabilities. Workarounds are available to mitigate the effects of
these vulnerabilities.
This advisory is posted at
http://www.cisco.com/warp/public/707/cisco-sa-20080326-dlsw.shtml
Note: The March 26, 2008 publication includes five Security
Advisories. The Advisories all affect Cisco's Internetwork Operating
System (IOS). Each Advisory lists the releases that correct the
vulnerability described in the Advisory, and the Advisories also
detail the releases that correct the vulnerabilities in all five
Advisories. Please reference the following software table to find a
release which fixes all published Security Advisories as of March
26th, 2008.
* March 26th bundled IOS Advisory Table
http://www.cisco.com/warp/public/707/cisco-sa-20080326-bundle.shtml
Individual publication links are listed below:
* Cisco IOS Virtual Private Dial-up Network Denial of Service
Vulnerability
http://www.cisco.com/warp/public/707/cisco-sa-20080326-pptp.shtml
* Multiple DLSw Denial of Service Vulnerabilities in Cisco IOS
http://www.cisco.com/warp/public/707/cisco-sa-20080326-dlsw.shtml
* Cisco IOS User Datagram Protocol Delivery Issue For IPv4/IPv6
Dual-stack Routers
http://www.cisco.com/warp/public/707/cisco-sa-20080326-IPv4IPv6.shtml
* Vulnerability in Cisco IOS with OSPF, MPLS VPN, and Supervisor
32, Supervisor 720, or Route Switch Processor 720
http://www.cisco.com/warp/public/707/cisco-sa-20080326-queue.shtml
* Cisco IOS Multicast Virtual Private Network (MVPN) Data Leak
http://www.cisco.com/warp/public/707/cisco-sa-20080326-mvpn.shtml
Affected Products
=================
Vulnerable Products
+------------------
This security advisory applies to all Cisco products that run any
version of affected Cisco IOS software configured for DLSw. Systems
that contain the DLSw feature, but do not have it enabled, are not
affected.
Routers enabled for DLSw contain a line in the configuration defining
a local DLSw peer. This configuration can be observed by issuing the
command "show running-config". Systems configured for DLSw contain
lines similar to the following:
"dlsw local-peer"
or
"dlsw local-peer peer-id <IP address>"
Any version of Cisco IOS prior to the versions which are listed in
the Software Versions and Fixes section below is vulnerable.
To determine the version of Cisco IOS software running on a Cisco
product, log in to the device and issue the show version command to
display the system banner. Cisco IOS Software will identify itself as
"Internetwork Operating System Software" or simply "IOS". On the next
line of output, the image name will be displayed between parentheses,
followed by "Version" and the IOS release name. Other Cisco devices
will not have the "show version" command or will give different
output.
The following example identifies a Cisco product running Cisco IOS
Software Release 12.3(6) with an installed image name of C3640-IS-M:
Cisco Internetwork Operating System Software
IOS (tm) 3600 Software (C3640-IS-M), Version 12.3(6), RELEASE SOFTWARE (fc3)
The next example shows a product running Cisco IOS Software Release
12.3(11)T3 with an image name of C3845-ADVIPSERVICESK9-M:
Cisco IOS Software, 3800 Software (C3845-ADVIPSERVICESK9-M), Version 12.3(11)T3, RELEASE SOFTWARE
(fc4)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2005 by Cisco Systems, Inc.
Additional information about Cisco IOS release naming can be found at
http://www.cisco.com/warp/public/620/1.html.
Products Confirmed Not Vulnerable
+--------------------------------
Cisco IOS devices that are not configured for DLSw are not
vulnerable.
No other Cisco products are currently known to be affected by these
vulnerabilities.
Details
=======
Data-link switching (DLSw) provides a means of transporting IBM
Systems Network Architecture (SNA) and network basic input/output
system (NetBIOS) traffic over an IP network. Cisco implementation of
DLSw also uses UDP port 2067 and IP Protocol 91 for Fast Sequenced
Transport (FST).
Multiple vulnerabilities exists in Cisco IOS when processing UDP and
IP protocol 91 packets. These vulnerabilities do not affect TCP
packet processing. A successful exploitation may result in a reload
of the system or a memory leak on the device, leading to a denial of
service (DoS) condition.
Cisco IOS devices configured for DLSw with "dlsw local-peer"
automatically listen for IP protocol 91 packets. A Cisco IOS device
that is configured for DLSw with the "dlsw local-peer peer-id
<IP-address>" command listen for IP protocol 91 packets and UDP port
2067.
Cisco IOS devices listen to IP protocol 91 packets when DLSw is
configured. However, it is only used if DLSw is configured for Fast
Sequenced Transport (FST). A DLSw FST peer configuration will contain
the following line:
"dlsw remote-peer 0 fst <ip-address>"
It is possible to disable UDP processing in DLSw with the "dlsw
udp-disable" command. However, disabling UDP only prevents the
sending of UDP packets, it does not prevent the device from receiving
and processing incoming UDP packets.
These vulnerabilities are documented in Cisco Bug ID CSCsk73104
and have been assigned Common Vulnerabilities and Exposures (CVE) ID
CVE-2008-1152.
Vulnerability Scoring Details
=============================
Cisco has provided scores for the vulnerabilities in this advisory
based on the Common Vulnerability Scoring System (CVSS). The CVSS
scoring in this Security Advisory is done in accordance with CVSS
version 2.0.
CVSS is a standards-based scoring method that conveys vulnerability
severity and helps determine urgency and priority of response.
Cisco has provided a base and temporal score. Customers can then
compute environmental scores to assist in determining the impact of
the vulnerability in individual networks.
Cisco has provided an FAQ to answer additional questions regarding
CVSS at
http://www.cisco.com/web/about/security/intelligence/cvss-qandas.html
Cisco has also provided a CVSS calculator to help compute the
environmental impact for individual networks at
http://intellishield.cisco.com/security/alertmanager/cvss
CSCsk73104 - Handling of malformed packets by DLSW
CVSS Base Score - 7.8
Access Vector: Network
Access Complexity: Low
Authentication: None
Confidentiality Impact: None
Integrity Impact: None
Availability Impact: Complete
CVSS Temporal Score - 6.4
Exploitability: Functional
Remediation Level: Official-Fix
Report Confidence: Confirmed
Impact
======
Successful exploitation of these vulnerabilities may result in the
reload of the device or memory leaks, leading to a DoS condition.
Software Versions and Fixes
===========================
When considering software upgrades, also consult
http://www.cisco.com/go/psirt and any subsequent advisories to
determine exposure and a complete upgrade solution.
In all cases, customers should exercise caution to be certain the
devices to be upgraded contain sufficient memory and that current
hardware and software configurations will continue to be supported
properly by the new release. If the information is not clear, contact
the Cisco Technical Assistance Center (TAC) or your contracted
maintenance provider for assistance.
Each row of the Cisco IOS software table (below) names a Cisco IOS
release train. If a given release train is vulnerable, then the
earliest possible releases that contain the fix (along with the
anticipated date of availability for each, if applicable) are listed
in the "First Fixed Release" column of the table. The "Recommended
Release" column indicates the releases which have fixes for all the
published vulnerabilities at the time of this Advisory. A device
running a release in the given train that is earlier than the release
in a specific column (less than the First Fixed Release) is known to
be vulnerable. Cisco recommends upgrading to a release equal to or
later than the release in the "Recommended Releases" column of the
table.
+----------------------------------------+
| Major | Availability of Repaired |
| Release | Releases |
|------------+---------------------------|
| Affected | First Fixed | Recommended |
| 12.0-Based | Release | Release |
| Releases | | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.0 | first fixed | 12.3(26) |
| | in 12.3 | |
|------------+-------------+-------------|
| | Releases | |
| | prior to | |
| | 12.0(8)DA3 | |
| | are | |
| | vulnerable, | |
| | release | |
| 12.0DA | 12.0(8)DA3 | |
| | and later | |
| | are not | |
| | vulnerable; | |
| | migrate to | |
| | any release | |
| | in 12.2DA | |
|------------+-------------+-------------|
| | Releases | |
| | prior to | |
| | 12.0(7)DB | |
| | are | |
| | vulnerable, | |
| 12.0DB | release | 12.4(18a) |
| | 12.0(7)DB | |
| | and later | |
| | are not | |
| | vulnerable; | |
| | first fixed | |
| | in 12.4 | |
|------------+-------------+-------------|
| | Releases | |
| | prior to | |
| | 12.0(7)DC | |
| | are | |
| | vulnerable, | |
| 12.0DC | release | 12.4(18a) |
| | 12.0(7)DC | |
| | and later | |
| | are not | |
| | vulnerable; | |
| | first fixed | |
| | in 12.4 | |
|------------+-------------+-------------|
| | Releases | |
| | prior to | |
| | 12.0(17)S5 | |
| | are | |
| 12.0S | vulnerable, | 12.0(32)S10 |
| | release | |
| | 12.0(17)S5 | |
| | and later | |
| | are not | |
| | vulnerable; | |
|------------+-------------+-------------|
| 12.0SC | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| 12.0SL | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| 12.0SP | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| 12.0ST | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| 12.0SX | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| 12.0SY | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| 12.0SZ | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.0T | first fixed | 12.3(26) |
| | in 12.3 | |
|------------+-------------+-------------|
| 12.0W | Vulnerable; | 12.0(3c)W5 |
| | contact TAC | (8) |
|------------+-------------+-------------|
| 12.0WC | Vulnerable; | |
| | contact TAC | |
|------------+-------------+-------------|
| 12.0WT | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.0XA | first fixed | 12.3(26) |
| | in 12.3 | |
|------------+-------------+-------------|
| 12.0XB | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| | Releases | |
| | prior to | |
| | 12.0(2)XC2 | |
| | are | |
| | vulnerable, | |
| 12.0XC | release | 12.3(26) |
| | 12.0(2)XC2 | |
| | and later | |
| | are not | |
| | vulnerable; | |
| | first fixed | |
| | in 12.3 | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.0XD | first fixed | 12.3(26) |
| | in 12.3 | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.0XE | first fixed | |
| | in 12.1E | |
|------------+-------------+-------------|
| 12.0XF | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.0XG | first fixed | 12.3(26) |
| | in 12.3 | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.0XH | first fixed | 12.3(26) |
| | in 12.3 | |
|------------+-------------+-------------|
| | Releases | |
| | prior to | |
| | 12.0(4)XI2 | |
| | are | |
| | vulnerable, | |
| 12.0XI | release | 12.3(26) |
| | 12.0(4)XI2 | |
| | and later | |
| | are not | |
| | vulnerable; | |
| | first fixed | |
| | in 12.3 | |
|------------+-------------+-------------|
| | Releases | |
| | prior to | |
| | 12.0(4)XJ5 | |
| | are | |
| | vulnerable, | |
| 12.0XJ | release | 12.3(26) |
| | 12.0(4)XJ5 | |
| | and later | |
| | are not | |
| | vulnerable; | |
| | first fixed | |
| | in 12.3 | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.0XK | first fixed | 12.3(26) |
| | in 12.3 | |
|------------+-------------+-------------|
| 12.0XL | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| 12.0XM | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.0XN | first fixed | 12.3(26) |
| | in 12.3 | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.0XQ | first fixed | 12.3(26) |
| | in 12.3 | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.0XR | first fixed | 12.3(26) |
| | in 12.3 | |
|------------+-------------+-------------|
| 12.0XS | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| 12.0XV | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| 12.0XW | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| Affected | First Fixed | Recommended |
| 12.1-Based | Release | Release |
| Releases | | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.1 | first fixed | 12.3(26) |
| | in 12.3 | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.1AA | first fixed | 12.3(26) |
| | in 12.3 | |
|------------+-------------+-------------|
| 12.1AX | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| | Releases | |
| | prior to | |
| | 12.1(22)AY1 | |
| | are | |
| 12.1AY | vulnerable, | 12.1(22) |
| | release | EA11 |
| | 12.1(22)AY1 | |
| | and later | |
| | are not | |
| | vulnerable; | |
|------------+-------------+-------------|
| 12.1AZ | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| 12.1CX | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| 12.1DA | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| | Releases | |
| | prior to | |
| | 12.1(4)DB1 | |
| | are | |
| | vulnerable, | |
| 12.1DB | release | 12.4(18a) |
| | 12.1(4)DB1 | |
| | and later | |
| | are not | |
| | vulnerable; | |
| | first fixed | |
| | in 12.4 | |
|------------+-------------+-------------|
| | Releases | |
| | prior to | |
| | 12.1(4)DC2 | |
| | are | |
| | vulnerable, | |
| 12.1DC | release | 12.4(18a) |
| | 12.1(4)DC2 | |
| | and later | |
| | are not | |
| | vulnerable; | |
| | first fixed | |
| | in 12.4 | |
|------------+-------------+-------------|
| 12.1E | 12.1(27b)E4 | |
|------------+-------------+-------------|
| | Releases | |
| | prior to | |
| | 12.1(11)EA1 | |
| | are | |
| 12.1EA | vulnerable, | 12.1(22) |
| | release | EA11 |
| | 12.1(11)EA1 | |
| | and later | |
| | are not | |
| | vulnerable; | |
|------------+-------------+-------------|
| 12.1EB | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.1EC | migrate to | 12.3(23)BC1 |
| | any release | |
| | in 12.2BC | |
|------------+-------------+-------------|
| 12.1EO | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| 12.1EU | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| 12.1EV | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| 12.1EW | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.1EX | first fixed | |
| | in 12.1E | |
|------------+-------------+-------------|
| 12.1EY | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.1EZ | first fixed | |
| | in 12.1E | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.1GA | first fixed | 12.3(26) |
| | in 12.3 | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.1GB | first fixed | 12.3(26) |
| | in 12.3 | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.1T | first fixed | 12.3(26) |
| | in 12.3 | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.1XA | first fixed | 12.3(26) |
| | in 12.3 | |
|------------+-------------+-------------|
| 12.1XB | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.1XC | first fixed | 12.3(26) |
| | in 12.3 | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.1XD | first fixed | 12.3(26) |
| | in 12.3 | |
|------------+-------------+-------------|
| 12.1XE | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| 12.1XF | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.1XG | first fixed | 12.3(26) |
| | in 12.3 | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.1XH | first fixed | 12.3(26) |
| | in 12.3 | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.1XI | first fixed | 12.3(26) |
| | in 12.3 | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.1XJ | first fixed | 12.3(26) |
| | in 12.3 | |
|------------+-------------+-------------|
| 12.1XK | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| 12.1XL | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.1XM | first fixed | 12.3(26) |
| | in 12.3 | |
|------------+-------------+-------------|
| 12.1XN | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| 12.1XO | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.1XP | first fixed | 12.3(26) |
| | in 12.3 | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.1XQ | first fixed | 12.3(26) |
| | in 12.3 | |
|------------+-------------+-------------|
| 12.1XR | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.1XS | first fixed | 12.3(26) |
| | in 12.3 | |
|------------+-------------+-------------|
| | Releases | |
| | prior to | |
| | 12.1(3)XT2 | |
| | are | |
| | vulnerable, | |
| 12.1XT | release | 12.3(26) |
| | 12.1(3)XT2 | |
| | and later | |
| | are not | |
| | vulnerable; | |
| | first fixed | |
| | in 12.3 | |
|------------+-------------+-------------|
| 12.1XU | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| | Releases | |
| | prior to | |
| | 12.1(5)XV1 | |
| | are | |
| | vulnerable, | |
| 12.1XV | release | 12.3(26) |
| | 12.1(5)XV1 | |
| | and later | |
| | are not | |
| | vulnerable; | |
| | first fixed | |
| | in 12.3 | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.1XW | first fixed | 12.3(26) |
| | in 12.3 | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.1XX | first fixed | 12.3(26) |
| | in 12.3 | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.1XY | first fixed | 12.3(26) |
| | in 12.3 | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.1XZ | first fixed | 12.3(26) |
| | in 12.3 | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.1YA | first fixed | 12.3(26) |
| | in 12.3 | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.1YB | first fixed | 12.3(26) |
| | in 12.3 | |
|------------+-------------+-------------|
| 12.1YC | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.1YD | first fixed | 12.3(26) |
| | in 12.3 | |
|------------+-------------+-------------|
| | Releases | |
| | prior to | |
| | 12.1(5)YE1 | |
| | are | |
| | vulnerable, | |
| 12.1YE | release | 12.3(26) |
| | 12.1(5)YE1 | |
| | and later | |
| | are not | |
| | vulnerable; | |
| | first fixed | |
| | in 12.3 | |
|------------+-------------+-------------|
| 12.1YF | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| 12.1YG | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| 12.1YH | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.1YI | first fixed | 12.3(26) |
| | in 12.3 | |
|------------+-------------+-------------|
| 12.1YJ | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| Affected | First Fixed | Recommended |
| 12.2-Based | Release | Release |
| Releases | | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.2 | first fixed | 12.3(26) |
| | in 12.3 | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.2B | first fixed | 12.4(18a) |
| | in 12.4 | |
|------------+-------------+-------------|
| 12.2BC | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.2BW | first fixed | 12.3(26) |
| | in 12.3 | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.2BY | first fixed | 12.4(18a) |
| | in 12.4 | |
|------------+-------------+-------------|
| 12.2BZ | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| 12.2CX | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| 12.2CY | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| 12.2CZ | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| 12.2DA | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.2DD | first fixed | 12.4(18a) |
| | in 12.4 | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.2DX | first fixed | 12.4(18a) |
| | in 12.4 | |
|------------+-------------+-------------|
| 12.2EU | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| 12.2EW | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| 12.2EWA | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.2EX | migrate to | 12.2(40)EX1 |
| | any release | |
| | in 12.2SEA | |
|------------+-------------+-------------|
| 12.2EY | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| 12.2EZ | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| 12.2FX | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| 12.2FY | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| 12.2FZ | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| 12.2IXA | Vulnerable; | |
| | contact TAC | |
|------------+-------------+-------------|
| 12.2IXB | Vulnerable; | |
| | contact TAC | |
|------------+-------------+-------------|
| 12.2IXC | Vulnerable; | |
| | contact TAC | |
|------------+-------------+-------------|
| 12.2IXD | Vulnerable; | |
| | contact TAC | |
|------------+-------------+-------------|
| | Vulnerable; | 12.2(18) |
| | migrate to | IXF; |
| 12.2IXE | any release | Available |
| | in 12.2IXF | on |
| | | 31-MAR-08 |
|------------+-------------+-------------|
| 12.2JA | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| 12.2JK | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| 12.2MB | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| 12.2MC | 12.2(15) | 12.4(18a) |
| | MC2h | |
|------------+-------------+-------------|
| 12.2S | 12.2(25)S15 | 12.2(25)S15 |
|------------+-------------+-------------|
| | 12.2(28) | |
| | SB10 | |
| | | |
| | 12.2(31)SB9 | 12.2(28) |
| 12.2SB | | SB12 |
| | 12.2(33)SB; | |
| | Available | |
| | on | |
| | 31-MAR-08 | |
|------------+-------------+-------------|
| | Vulnerable; | |
| | first fixed | |
| | in 12.2SB | |
| | | |
| 12.2SBC | Vulnerable; | 12.2(28) |
| | first fixed | SB12 |
| | in 12.2SB; | |
| | Available | |
| | on | |
| | 31-MAR-08 | |
|------------+-------------+-------------|
| 12.2SCA | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| 12.2SE | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| 12.2SEA | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| 12.2SEB | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| 12.2SEC | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| 12.2SED | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| 12.2SEE | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| 12.2SEF | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| 12.2SEG | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| 12.2SG | 12.2(44)SG | 12.2(44)SG |
|------------+-------------+-------------|
| 12.2SGA | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| 12.2SL | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| 12.2SM | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| 12.2SO | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| 12.2SRA | 12.2(33) | 12.2(33) |
| | SRA6 | SRA7 |
|------------+-------------+-------------|
| | 12.2(33) | 12.2(33) |
| | SRB3; | SRB3; |
| 12.2SRB | Available | Available |
| | on | on |
| | 31-MAR-08 | 31-MAR-08 |
|------------+-------------+-------------|
| 12.2SRC | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.2SU | first fixed | 12.4(18a) |
| | in 12.4 | |
|------------+-------------+-------------|
| | Releases | |
| | prior to | |
| | 12.2(29a) | |
| | SV1 are | |
| | vulnerable, | |
| | release | |
| 12.2SV | 12.2(29a) | 12.2(29b)SV |
| | SV1 and | |
| | later are | |
| | not | |
| | vulnerable; | |
| | migrate to | |
| | any release | |
| | in 12.2SVA | |
|------------+-------------+-------------|
| 12.2SVA | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| 12.2SVC | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| 12.2SVD | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| | Releases | |
| | prior to | |
| | 12.2(25) | |
| | SW10 are | |
| | vulnerable, | |
| 12.2SW | release | |
| | 12.2(25) | |
| | SW10 and | |
| | later are | |
| | not | |
| | vulnerable; | |
|------------+-------------+-------------|
| | Vulnerable; | 12.2(18) |
| 12.2SX | first fixed | SXF13 |
| | in 12.2SXF | |
|------------+-------------+-------------|
| | Vulnerable; | 12.2(18) |
| 12.2SXA | first fixed | SXF13 |
| | in 12.2SXF | |
|------------+-------------+-------------|
| | Vulnerable; | 12.2(18) |
| 12.2SXB | first fixed | SXF13 |
| | in 12.2SXF | |
|------------+-------------+-------------|
| | Vulnerable; | 12.2(18) |
| 12.2SXD | first fixed | SXF13 |
| | in 12.2SXF | |
|------------+-------------+-------------|
| | Vulnerable; | 12.2(18) |
| 12.2SXE | first fixed | SXF13 |
| | in 12.2SXF | |
|------------+-------------+-------------|
| | 12.2(18) | |
| | SXF12 | |
| | | |
| 12.2SXF | 12.2(18) | 12.2(18) |
| | SXF12a | SXF13 |
| | | |
| | 12.2(18) | |
| | SXF13a | |
|------------+-------------+-------------|
| 12.2SXH | 12.2(33) | |
| | SXH1 | |
|------------+-------------+-------------|
| | Vulnerable; | 12.2(18) |
| 12.2SY | first fixed | SXF13 |
| | in 12.2SXF | |
|------------+-------------+-------------|
| | | 12.2(25)S15 |
| | Vulnerable; | |
| 12.2SZ | first fixed | 12.2(28) |
| | in 12.2S | SB12 |
| | | |
| | | 12.2(33)SRC |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.2T | first fixed | 12.3(26) |
| | in 12.3 | |
|------------+-------------+-------------|
| 12.2TPC | 12.2(8) | |
| | TPC10d | |
|------------+-------------+-------------|
| 12.2UZ | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.2XA | first fixed | 12.3(26) |
| | in 12.3 | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.2XB | first fixed | 12.3(26) |
| | in 12.3 | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.2XC | first fixed | 12.4(18a) |
| | in 12.4 | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.2XD | first fixed | 12.3(26) |
| | in 12.3 | |
|------------+-------------+-------------|
| 12.2XE | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| 12.2XF | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.2XG | first fixed | 12.3(26) |
| | in 12.3 | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.2XH | first fixed | 12.3(26) |
| | in 12.3 | |
|------------+-------------+-------------|
| 12.2XI | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.2XJ | first fixed | 12.3(26) |
| | in 12.3 | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.2XK | first fixed | 12.3(26) |
| | in 12.3 | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.2XL | first fixed | 12.3(26) |
| | in 12.3 | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.2XM | first fixed | 12.3(26) |
| | in 12.3 | |
|------------+-------------+-------------|
| 12.2XN | 12.2(33)XN1 | 12.3(26) |
|------------+-------------+-------------|
| 12.2XO | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.2XQ | first fixed | 12.3(26) |
| | in 12.3 | |
|------------+-------------+-------------|
| 12.2XR | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| 12.2XS | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.2XT | first fixed | 12.3(26) |
| | in 12.3 | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.2XU | first fixed | 12.3(26) |
| | in 12.3 | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.2XV | first fixed | 12.3(26) |
| | in 12.3 | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.2XW | first fixed | 12.3(26) |
| | in 12.3 | |
|------------+-------------+-------------|
| | Releases | |
| | prior to | |
| | 12.2(4)YA8 | |
| | are | |
| | vulnerable, | |
| 12.2YA | release | 12.3(26) |
| | 12.2(4)YA8 | |
| | and later | |
| | are not | |
| | vulnerable; | |
| | first fixed | |
| | in 12.3 | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.2YB | first fixed | 12.3(26) |
| | in 12.3 | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.2YC | first fixed | 12.3(26) |
| | in 12.3 | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.2YD | first fixed | 12.4(18a) |
| | in 12.4 | |
|------------+-------------+-------------|
| | | 12.2(25)S15 |
| | Vulnerable; | |
| 12.2YE | first fixed | 12.2(28) |
| | in 12.2S | SB12 |
| | | |
| | | 12.2(33)SRC |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.2YF | first fixed | 12.3(26) |
| | in 12.3 | |
|------------+-------------+-------------|
| 12.2YG | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.2YH | first fixed | 12.3(26) |
| | in 12.3 | |
|------------+-------------+-------------|
| | Releases | |
| | prior to | |
| | 12.2(8)YJ1 | |
| | are | |
| | vulnerable, | |
| 12.2YJ | release | 12.3(26) |
| | 12.2(8)YJ1 | |
| | and later | |
| | are not | |
| | vulnerable; | |
| | first fixed | |
| | in 12.3 | |
|------------+-------------+-------------|
| 12.2YK | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.2YL | first fixed | 12.4(18a) |
| | in 12.4 | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.2YM | first fixed | 12.4(18a) |
| | in 12.4 | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.2YN | first fixed | 12.4(18a) |
| | in 12.4 | |
|------------+-------------+-------------|
| | Vulnerable; | 12.2(18) |
| 12.2YO | first fixed | SXF13 |
| | in 12.2SXF | |
|------------+-------------+-------------|
| 12.2YP | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| 12.2YQ | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| 12.2YR | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| 12.2YS | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.2YT | first fixed | 12.3(26) |
| | in 12.3 | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.2YU | first fixed | 12.4(18a) |
| | in 12.4 | |
|------------+-------------+-------------|
| | Releases | |
| | prior to | |
| | 12.2(11)YV1 | |
| | are | |
| | vulnerable, | |
| 12.2YV | release | 12.4(18a) |
| | 12.2(11)YV1 | |
| | and later | |
| | are not | |
| | vulnerable; | |
| | first fixed | |
| | in 12.4 | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.2YW | first fixed | 12.4(18a) |
| | in 12.4 | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.2YX | first fixed | 12.4(18a) |
| | in 12.4 | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.2YY | first fixed | 12.4(18a) |
| | in 12.4 | |
|------------+-------------+-------------|
| | | 12.2(25)S15 |
| | Vulnerable; | |
| 12.2YZ | first fixed | 12.2(28) |
| | in 12.2S | SB12 |
| | | |
| | | 12.2(33)SRC |
|------------+-------------+-------------|
| | Vulnerable; | 12.2(18) |
| 12.2ZA | first fixed | SXF13 |
| | in 12.2SXF | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.2ZB | first fixed | 12.4(18a) |
| | in 12.4 | |
|------------+-------------+-------------|
| 12.2ZC | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| 12.2ZD | Vulnerable; | |
| | contact TAC | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.2ZE | first fixed | 12.3(26) |
| | in 12.3 | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.2ZF | first fixed | 12.4(18a) |
| | in 12.4 | |
|------------+-------------+-------------|
| 12.2ZG | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| | Releases | |
| | prior to | |
| | 12.2(13)ZH6 | |
| | are | |
| | vulnerable, | |
| 12.2ZH | release | 12.2(13) |
| | 12.2(13)ZH6 | ZH11 |
| | and later | |
| | are not | |
| | vulnerable; | |
| | first fixed | |
| | in 12.4 | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.2ZJ | first fixed | 12.4(18a) |
| | in 12.4 | |
|------------+-------------+-------------|
| | Vulnerable; | 12.4(15)T4 |
| 12.2ZL | first fixed | |
| | in 12.4 | 12.4(18a) |
|------------+-------------+-------------|
| 12.2ZP | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| | Vulnerable; | 12.2(33) |
| 12.2ZU | first fixed | SXH2 |
| | in 12.2SXH | |
|------------+-------------+-------------|
| 12.2ZY | 12.2(18)ZY2 | 12.2(18)ZY2 |
|------------+-------------+-------------|
| Affected | First Fixed | Recommended |
| 12.3-Based | Release | Release |
| Releases | | |
|------------+-------------+-------------|
| 12.3 | 12.3(24) | 12.3(26) |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.3B | first fixed | 12.4(18a) |
| | in 12.4 | |
|------------+-------------+-------------|
| 12.3BC | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.3BW | first fixed | 12.4(18a) |
| | in 12.4 | |
|------------+-------------+-------------|
| 12.3EU | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| 12.3JA | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| 12.3JEA | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| 12.3JEB | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| 12.3JEC | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| | Releases | |
| | prior to | |
| | 12.3(8)JK1 | |
| | are | |
| 12.3JK | vulnerable, | 12.3(8)JK1 |
| | release | |
| | 12.3(8)JK1 | |
| | and later | |
| | are not | |
| | vulnerable; | |
|------------+-------------+-------------|
| 12.3JL | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| 12.3JX | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.3T | first fixed | 12.4(18a) |
| | in 12.4 | |
|------------+-------------+-------------|
| 12.3TPC | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| 12.3VA | Vulnerable; | |
| | contact TAC | |
|------------+-------------+-------------|
| | 12.3(2)XA7; | 12.3(2)XA7; |
| 12.3XA | Available | Available |
| | on | on |
| | 31-MAR-08 | 31-MAR-08 |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.3XB | first fixed | 12.4(18a) |
| | in 12.4 | |
|------------+-------------+-------------|
| | | 12.4(15)T4 |
| 12.3XC | 12.3(2)XC5 | |
| | | 12.4(18a) |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.3XD | first fixed | 12.4(18a) |
| | in 12.4 | |
|------------+-------------+-------------|
| | 12.3(2)XE6; | 12.4(15)T4 |
| 12.3XE | Available | |
| | on | 12.4(18a) |
| | 31-MAR-08 | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.3XF | first fixed | 12.4(18a) |
| | in 12.4 | |
|------------+-------------+-------------|
| | Vulnerable; | |
| | first fixed | 12.4(15)T4 |
| 12.3XG | in 12.3YG; | |
| | Available | 12.4(18a) |
| | on | |
| | 16-JUN-08 | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.3XH | first fixed | 12.4(18a) |
| | in 12.4 | |
|------------+-------------+-------------|
| | 12.3(7) | |
| | XI11; | |
| 12.3XI | Available | |
| | on | |
| | 18-SEP-08 | |
|------------+-------------+-------------|
| | Vulnerable; | 12.3(14) |
| 12.3XJ | first fixed | YX11 |
| | in 12.3YX | |
| | | 12.4(15)T4 |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.3XK | first fixed | 12.4(18a) |
| | in 12.4 | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.3XQ | first fixed | 12.4(18a) |
| | in 12.4 | |
|------------+-------------+-------------|
| | 12.3(7)XR8; | 12.3(7)XR8; |
| 12.3XR | Available | Available |
| | on | on |
| | 31-MAR-08 | 31-MAR-08 |
|------------+-------------+-------------|
| 12.3XS | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.3XU | first fixed | 12.4(15)T4 |
| | in 12.4T | |
|------------+-------------+-------------|
| | Vulnerable; | 12.3(14) |
| 12.3XW | first fixed | YX11 |
| | in 12.3YX | |
| | | 12.4(15)T4 |
|------------+-------------+-------------|
| 12.3XY | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| 12.3YA | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| 12.3YD | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| | Vulnerable; | 12.3(14) |
| 12.3YF | first fixed | YX11 |
| | in 12.3YX | |
| | | 12.4(15)T4 |
|------------+-------------+-------------|
| | 12.3(8)YG7; | |
| 12.3YG | Available | 12.4(15)T4 |
| | on | |
| | 16-JUN-08 | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.3YH | first fixed | 12.4(15)T4 |
| | in 12.4T | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.3YI | first fixed | 12.4(15)T4 |
| | in 12.4T | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.3YJ | first fixed | 12.4(15)T4 |
| | in 12.4T | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.3YK | first fixed | 12.4(15)T4 |
| | in 12.4T | |
|------------+-------------+-------------|
| 12.3YM | 12.3(14) | 12.3(14) |
| | YM12 | YM12 |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.3YQ | first fixed | 12.4(15)T4 |
| | in 12.4T | |
|------------+-------------+-------------|
| | 12.3(11) | |
| | YS3; | |
| 12.3YS | Available | 12.4(15)T4 |
| | on | |
| | 31-MAR-08 | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.3YT | first fixed | 12.4(15)T4 |
| | in 12.4T | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.3YU | first fixed | |
| | in 12.4XB | |
|------------+-------------+-------------|
| 12.3YX | 12.3(14) | 12.3(14) |
| | YX11 | YX11 |
|------------+-------------+-------------|
| 12.3YZ | 12.3(11)YZ3 | |
|------------+-------------+-------------|
| Affected | First Fixed | Recommended |
| 12.4-Based | Release | Release |
| Releases | | |
|------------+-------------+-------------|
| | 12.4(10c) | |
| | | |
| | 12.4(13e) | |
| | | |
| | 12.4(16b) | |
| 12.4 | | 12.4(18a) |
| | 12.4(17) | |
| | | |
| | 12.4(3h) | |
| | | |
| | 12.4(8d) | |
|------------+-------------+-------------|
| 12.4JA | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| 12.4JK | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| 12.4JMA | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| 12.4JMB | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| 12.4JMC | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| 12.4JX | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| | 12.4(15)MD; | |
| 12.4MD | Available | |
| | on | |
| | 09-MAY-08 | |
|------------+-------------+-------------|
| 12.4MR | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| 12.4SW | Vulnerable; | |
| | contact TAC | |
|------------+-------------+-------------|
| | 12.4(15)T2 | |
| | | |
| 12.4T | 12.4(6)T10 | 12.4(15)T4 |
| | | |
| | 12.4(9)T7 | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.4XA | first fixed | 12.4(15)T4 |
| | in 12.4T | |
|------------+-------------+-------------|
| 12.4XB | 12.4(2)XB6 | |
|------------+-------------+-------------|
| 12.4XC | Vulnerable; | |
| | contact TAC | |
|------------+-------------+-------------|
| 12.4XD | 12.4(4)XD10 | 12.4(4)XD10 |
|------------+-------------+-------------|
| 12.4XE | 12.4(6)XE2 | 12.4(15)T4 |
|------------+-------------+-------------|
| 12.4XF | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| 12.4XG | 12.4(9)XG2 | 12.4(9)XG2 |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.4XJ | first fixed | 12.4(15)T4 |
| | in 12.4T | |
|------------+-------------+-------------|
| | Vulnerable; | |
| 12.4XK | first fixed | 12.4(15)T4 |
| | in 12.4T | |
|------------+-------------+-------------|
| 12.4XL | 12.4(15)XL2 | |
|------------+-------------+-------------|
| 12.4XM | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| 12.4XN | Not | |
| | Vulnerable | |
|------------+-------------+-------------|
| 12.4XT | 12.4(6)XT2 | 12.4(6)XT2 |
|------------+-------------+-------------|
| 12.4XV | 12.4(11)XV | |
|------------+-------------+-------------|
| 12.4XW | Vulnerable; | 12.4(11)XW6 |
| | contact TAC | |
|------------+-------------+-------------|
| 12.4XY | Not | |
| | Vulnerable | |
+----------------------------------------+
A special patch for Cisco IOS Software Modularity is also available
and can be downloaded from the Cisco IOS Software Modularity Patch
Navigator at http://tools.cisco.com/swdf/ionpn/jsp/main.jsp.
Workarounds
===========
The workaround consists of filtering UDP packets to port 2067 and IP
protocol 91 packets. Filters can be applied at network boundaries to
filter all IP protocol 91 packets and UDP packets to port 2067 or can
be applied on individual affected devices to permit such traffic only
from trusted peer IP addresses. However, since both of the protocols
are connectionless, it is possible for an attacker to spoof malformed
packets from legitimate peer IP addresses.
As soon as DLSw is configured, the Cisco IOS device begins listening
on IP protocol 91. However, this protocol is only used if DLSw is
configured for Fast Sequenced Transport (FST). A DLSw FST peer
configuration will contain the following line:
"dlsw remote-peer 0 fst <ip-address>"
If FST is used, filtering IP protocol 91 will break the operation, so
filters need to permit protocol 91 traffic from legitimate peer IP
addresses.
It is possible to disable UDP processing in DLSw with the "dlsw
udp-disable" command. However, disabling UDP only prevents the sending
of UDP packets, it does not prevent the receiving and processing of
incoming UDP packets. To protect a vulnerable device from malicious
packets via UDP port 2067, both of the following actions must be
taken:
1. Disable UDP outgoing packets with the "dlsw udp-disable" command,
AND
2. Filter UDP 2067 in the vulnerable device using infrastructure
ACL.
Additional mitigation techniques that can be deployed on Cisco
devices within the network are available in the Cisco Applied
Mitigation Bulletin companion document for this advisory:
http://www.cisco.com/warp/public/707/cisco-amb-20080326-dlsw.shtml
Using Control Plane Policing on Affected Devices
+-----------------------------------------------
Control Plane Policing (CoPP) can be used to block untrusted DLSw
traffic to the device. Cisco IOS software releases 12.0S, 12.2SX,
12.2S, 12.3T, 12.4, and 12.4T support the CoPP feature. CoPP may be
configured on a device to protect the management and control planes
to minimize the risk and effectiveness of direct infrastructure
attacks by explicitly permitting only authorized traffic sent to
infrastructure devices in accordance with existing security policies
and configurations. The following example, which uses 192.168.100.1
to represent a trusted host, can be adapted to your network. If FST
is not used, protocol 91 may be completely filtered. Additionally, if
UDP is disabled with the "dlsw udp-disable" command, UDP port 2067
may also be completely filtered.
!--- Deny DLSw traffic from trusted hosts to all IP addresses
!--- configured on all interfaces of the affected device so that
!--- it will be allowed by the CoPP feature
access-list 111 deny udp host 192.168.100.1 any eq 2067
access-list 111 deny 91 host 192.168.100.1 any
!--- Permit all other DLSw traffic sent to all IP addresses
!--- configured on all interfaces of the affected device so that it
!--- will be policed and dropped by the CoPP feature
access-list 111 permit udp any any eq 2067
access-list 111 permit 91 any any
!--- Permit (Police or Drop)/Deny (Allow) all other Layer 3 and Layer 4
!--- traffic in accordance with existing security policies and
!--- configurations for traffic that is authorized to be sent
!--- to infrastructure devices
!--- Create a Class-Map for traffic to be policed by
!--- the CoPP feature
class-map match-all drop-DLSw-class
match access-group 111
!--- Create a Policy-Map that will be applied to the
!--- Control-Plane of the device.
policy-map drop-DLSw-traffic
class drop-DLSw-class
drop
!--- Apply the Policy-Map to the Control-Plane of the
!--- device
control-plane
service-policy input drop-DLSw-traffic
In the above CoPP example, the access control entries (ACEs) which
match the potential exploit packets with the "permit" action result
in these packets being discarded by the policy-map "drop" function,
while packets that match the "deny" action (not shown) are not
affected by the policy-map drop function. Please note that in the
Cisco IOS 12.2S and 12.0S trains the policy-map syntax is different:
policy-map drop-DLSw-traffic
class drop-DLSw-class
police 32000 1500 1500 conform-action drop exceed-action drop
Additional information on the configuration and use of the CoPP
feature is available at
http://www.cisco.com/en/US/products/ps6642/products_white_paper0900aecd804fa16a.shtml
and http://www.cisco.com/en/US/products/sw/iosswrel/ps1838/products_feature_guide09186a008052446b.htm
l.
Using Infrastructure ACLs at Network Boundary
+--------------------------------------------
Although it is often difficult to block traffic transiting your
network, it is possible to identify traffic that should never be
allowed to target your infrastructure devices and block that traffic
at the border of your network. iACLs are a network security best
practice and should be considered as a long-term addition to good
network security as well as a workaround for this specific
vulnerability. The iACL example shown below should be included as
part of the deployed infrastructure access-list that will protect all
devices with IP addresses in the infrastructure IP address range. If
FST is not used, protocol 91 may be completely filtered.
Additionally, if UDP is disabled with the "dlsw udp-disable" command,
UDP port 2067 may also be completely filtered.
!--- Permit DLSw (UDP port 2067 and IP protocol 91) packets
!--- from trusted hosts destined to infrastructure addresses.
access-list 150 permit udp TRUSTED_HOSTS MASK INFRASTRUCTURE_ADDRESSES MASK eq 2067
access-list 150 permit 91 TRUSTED_HOSTS MASK INFRASTRUCTURE_ADDRESSES MASK
!--- Deny DLSw (UDP port 2067 and IP protocol 91) packets from
!--- all other sources destined to infrastructure addresses.
access-list 150 deny udp any INFRASTRUCTURE_ADDRESSES MASK eq 2067
access-list 150 deny 91 any INFRASTRUCTURE_ADDRESSES MASK
!--- Permit/deny all other Layer 3 and Layer 4 traffic in accordance
!--- with existing security policies and configurations
!--- Permit all other traffic to transit the device.
access-list 150 permit ip any any
interface serial 2/0
ip access-group 150 in
The white paper entitled "Protecting Your Core: Infrastructure
Protection Access Control Lists" presents guidelines and recommended
deployment techniques for infrastructure protection access lists.
This white paper can be obtained at the following link:
http://www.cisco.com/en/US/tech/tk648/tk361/technologies_white_paper09186a00801a1a55.shtml
Obtaining Fixed Software
========================
Cisco has released free software updates that address these
vulnerabilities. Prior to deploying software, customers should
consult their maintenance provider or check the software for feature
set compatibility and known issues specific to their environment.
Customers may only install and expect support for the feature sets
they have purchased. By installing, downloading, accessing or
otherwise using such software upgrades, customers agree to be bound
by the terms of Cisco's software license terms found at
http://www.cisco.com/en/US/products/prod_warranties_item09186a008088e31f.html
or as otherwise set forth at Cisco.com Downloads at
http://www.cisco.com/public/sw-center/sw-usingswc.shtml.
Do not contact psirt@cisco.com or security-alert@cisco.com for
software upgrades.
Customers with Service Contracts
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