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Cisco Catalyst OS Lets Remote Authenticated Users Enter 'enable' Mode Without a Password
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SecurityTracker Alert ID: 1006644 |
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SecurityTracker URL: http://securitytracker.com/id/1006644
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CVE Reference:
CAN-2003-0216
(Links to External Site)
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Updated: Mar 23 2004
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Original Entry Date: Apr 24 2003
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Impact:
Root access via local system, Root access via network, User access via local system
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Fix Available: Yes Vendor Confirmed: Yes
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Version(s): 7.5(1) only
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Description:
A vulnerability was reported in the Cisco Catalyst OS. A remote authenticated user can gain elevated privileges on the system. In certain cases, a local user may be able to gain access to the switch.
Cisco reported that the CatOS 7.5(1) release allows any user with command line access to bypass password authentication and gain "enable" mode access without typing the enable password. As a result, a remote authenticated user can gain access to the "enable" mode without a password. Also, if local user authentication is enabled, a local user can gain access to the switch without a valid password.
The vulnerability resides in the local user authentication feature, according to the report.
Cisco has assigned Cisco Bug ID CSCea42030 to this flaw.
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Impact:
A remote authenticated user can gain access to the "enable" mode without a password.
If local user authentication is enabled, a physically local user can gain access to the switch and to the "enable" mode without a valid password.
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Solution:
The vendor has released a fixed version (7.6(1)). Cisco advises that users with contracts should obtain upgraded software through their regular update channels. For most customers, this means that upgrades should be obtained through the Software Center on Cisco's worldwide website at:
http://www.cisco.com/
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Vendor URL: www.cisco.com/warp/public/707/cisco-sa-20030424-catos.shtml (Links to External Site)
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Cause:
Authentication error
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Underlying OS:
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Message History:
None.
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Source Message Contents
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Date: Thu, 24 Apr 2003 09:23:12 -0400
Subject: Cisco Security Advisory: Cisco Catalyst Enable Password Bypass Vulnerability
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http://www.cisco.com/warp/public/707/cisco-sa-20030424-catos.shtml
[Editor's note: This text is from the Cisco web site, unmodified. Some HTML formatting
aspects may not be properly rendered.]
Cisco Security Advisory: Cisco Catalyst Enable Password Bypass Vulnerability
Revision 1.0
For Public Release 2003 April 24 08:00 (GMT)
--------------------------------------------------------------------------------
Please provide your feedback on this document.
--------------------------------------------------------------------------------
Contents
Summary
Affected Products
Details
Impact
Software Versions and Fixes
Obtaining Fixed Software
Workarounds
Exploitation and Public Announcements
Status of This Notice
Distribution
Revision History
Cisco Security Procedures
--------------------------------------------------------------------------------
Summary
Cisco Catalyst software permits unauthorized access to the enable mode in the 7.5(1)
release. Once initial access is granted, access can be obtained for the higher level
"enable" mode without a password. This problem is resolved in version 7.6(1). Customers
with vulnerable releases are urged to upgrade as soon as possible.
This issue is documented in Cisco Bug ID CSCea42030.
This advisory is available at
http://www.cisco.com/warp/public/707/cisco-sa-20030424-catos.shtml.
Affected Products
All users of Cisco Catalyst 4000, 6000, and 6500 with the Catalyst OS software version
7.5(1) only.
No other releases of Cisco Catalyst OS software are affected by this vulnerability.
Additionally, Catalyst hardware running Cisco IOSŪ software is not affected by this
vulnerability.
No other Cisco products are affected by this vulnerability.
Details
Anyone who can obtain command line access to an affected switch can bypass password
authentication to obtain "enable" mode access without knowledge of the "enable" password.
If local user authentication is enabled, a valid username can be used to gain access to
the switch without a valid password. This same local user could then enter enable without
a valid password.
Command line access is provided through the console, telnet access, or ssh access methods;
http access mode is not affected.
This problem was introduced with the local user authentication feature in software version
7.5(1), and is corrected in version 7.6(1).
Bug ID
CSCea42030
Impact
This vulnerability permits unauthorized access to the configuration mode and unauthorized
configuration changes on a Catalyst switch.
Software Versions and Fixes
This vulnerability is repaired in version 7.6(1) which is currently available.
Obtaining Fixed Software
Cisco is offering free software upgrades to remedy this vulnerability for all affected
customers. Customers may only install and expect support for the feature sets they have
purchased.
Customers with contracts should obtain upgraded software through their regular update
channels. For most customers, this means that upgrades should be obtained through the
Software Center on Cisco's worldwide website at http://www.cisco.com.
Customers whose Cisco products are provided or maintained through prior or existing
agreement with third-party support organizations such as Cisco Partners, authorized
resellers, or service providers should contact that support organization for assistance
with the upgrade, which should be free of charge.
Customers who purchase direct from Cisco but who do not hold a Cisco service contract and
customers who purchase through third-party vendors but are unsuccessful at obtaining fixed
software through their point of sale should get their upgrades by contacting the Cisco
Technical Assistance Center (TAC). TAC contacts are as follows:
+1 800 553 2447 (toll-free from within North America)
+1 408 526 7209 (toll call from anywhere in the world)
email: tac@cisco.com.
See http://www.cisco.com/warp/public/687/Directory/DirTAC.shtml for additional TAC contact
information, including special localized telephone numbers and instructions and e-mail
addresses for use in various languages.
Please have your product serial number available and give the URL of this notice as
evidence of your entitlement to a free upgrade. Free upgrades for non-contract customers
must be requested through the TAC.
Please do not contact either "psirt@cisco.com" or "security-alert@cisco.com" for software
upgrades
Workarounds
Strictly limiting telnet and/or ssh access to the device will prevent the initial
connection required to exploit this vulnerability. Telnet and/or ssh access can be
controlled with the following command set:
set ip permit <address> <mask> telnet
set ip permit <address> <mask> ssh
set ip permit enable
This command set will deny all traffic not specified in the permit statements for each
protocol.
Additionally, out-of-band management solutions, isolated management VLAN configurations,
and AAA authentication services can help mitigate this vulnerability by limiting the
initial access necessary for exploitation.
Exploitation and Public Announcements
The Cisco PSIRT is not aware of any public announcements or malicious use of the
vulnerabilities described in this advisory.
Status of This Notice: Draft
This is a draft notice. Although Cisco cannot guarantee the accuracy of all statements in
this notice, all the facts have been checked to the best of our ability. Cisco does not
anticipate issuing updated versions of this notice unless there is some material change in
the facts. Should there be a significant change in the facts, Cisco may update this notice.
Distribution
This notice will be posted on Cisco's worldwide website at
http://www.cisco.com/warp/public/707/cisco-sa-20030424-catos.shtml. In addition to
worldwide web posting, a text version of this notice is clear-signed with the Cisco PSIRT
PGP key and is posted to the following e-mail and Usenet news recipients:
cust-security-announce@cisco.com
bugtraq@securityfocus.com
full-disclosure@lists.netsys.com
first-teams@first.org (includes CERT/CC)
cisco@spot.colorado.edu
cisco-nsp@puck.nether.net
comp.dcom.sys.cisco
Various internal Cisco mailing lists
Future updates of this notice, if any, will be placed on Cisco's worldwide web. Users
concerned about this problem are encouraged to check the URL given above for any updates.
Revision History
Revision 1.0 24-April-2003 Initial public release.
Cisco Security Procedures
Complete information on reporting security vulnerabilities in Cisco products, obtaining
assistance with security incidents, and registering to receive security information from
Cisco, is available on Cisco's worldwide website at
http://www.cisco.com/warp/public/707/sec_incident_response.shtml. This includes
instructions for press inquiries regarding Cisco security notices. All Cisco Security
Advisories are available at http://www.cisco.com/go/psirt.
--------------------------------------------------------------------------------
This notice is Copyright 2003 by Cisco Systems, Inc. This notice may be redistributed
freely after the release date given at the top of the text, provided that redistributed
copies are complete and unmodified, and include all date and version information.
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