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Category:   Device (Router/Bridge/Hub)  >   Cisco IOS Vendors:   Cisco
Cisco IOS on Cisco 10000 Series Tunneled Traffic Lets Remote Users Deny Service
SecurityTracker Alert ID:  1027578
SecurityTracker URL:  http://securitytracker.com/id/1027578
CVE Reference:   CVE-2012-4620   (Links to External Site)
Date:  Sep 26 2012
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): Cisco 10000 Series only
Description:   A vulnerability was reported in Cisco IOS. A remote user can cause denial of service conditions.

A remote user can send specially crafted IP tunneled packets to an interface on the target device to trigger a queue wedge and cause the device to be unable to process traffic on the affected interface. Transit traffic does not trigger the vulnerability.

GRE/IP, IPIP, and IPv6 in IPv4 packets can trigger the flaw.

Cisco has assigned Cisco bug ID CSCts66808 to this vulnerability.

Only the Cisco 10000 Series router is affected.

Impact:   A remote user can cause the device to be unable to process traffic on the affected interface.
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://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20120926-c10k-tunnels

Vendor URL:  tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20120926-c10k-tunnels (Links to External Site)
Cause:   State error
Underlying OS:  

Message History:   None.


 Source Message Contents

Date:  Wed, 26 Sep 2012 12:18:34 -0400
Subject:  Cisco Security Advisory: Cisco IOS Software Tunneled Traffic Queue Wedge Vulnerability

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

Cisco IOS Software Tunneled Traffic Queue Wedge Vulnerability

Advisory ID: cisco-sa-20120926-c10k-tunnels

Revision 1.0

For Public Release 2012 September 26 16:00  UTC (GMT)
+---------------------------------------------------------------------

Summary
=======

Cisco IOS Software contains a queue wedge vulnerability that can be
triggered when processing IP tunneled packets.  Only Cisco IOS
Software running on the Cisco 10000 Series router has been
demonstrated to be affected.

Successful exploitation of this vulnerability may prevent traffic from
transiting the affected interfaces.

Cisco has released free software updates that addresses this
vulnerability.  There are no workarounds for this vulnerability.  This
advisory is available at the following link:

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20120926-c10k-tunnels

Note: The September 26, 2012, Cisco IOS Software Security Advisory
bundled publication includes 9 Cisco Security Advisories. Eight of the
advisories address vulnerabilities in Cisco IOS Software, and one
advisory addresses a vulnerability in Cisco Unified Communications
Manager. Each Cisco IOS Software Security Advisory lists the Cisco IOS
Software releases that correct the vulnerability or vulnerabilities
detailed in the advisory as well as the Cisco IOS Software releases
that correct all Cisco IOS Software vulnerabilities in the September
2012 bundled publication.

Individual publication links are in "Cisco Event Response: Semi-Annual
Cisco IOS Software Security Advisory Bundled Publication" at the
following link:

http://www.cisco.com/web/about/security/intelligence/Cisco_ERP_sep12.html

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