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  3. Cisco IOS Firewall Authentication Proxy Buffer Overflow Vulnerability

Cisco IOS Firewall Authentication Proxy Buffer Overflow Vulnerability

Risk

High

Date Discovered

September 7, 2005

Description

Cisco IOS Firewall Authentication Proxy is prone to a buffer overflow condition. Successful exploitation of this issue could cause a denial of service or potential execution of arbitrary code. This issue affects the FTP and Telnet protocols, but not HTTP.

Technologies Affected

  • Cisco IOS 12.2SEC
  • Cisco IOS 12.2SG
  • Cisco IOS 12.2SH
  • Cisco IOS 12.2SXF
  • Cisco IOS 12.2ZF
  • Cisco IOS 12.2ZH
  • Cisco IOS 12.2ZL
  • Cisco IOS 12.3
  • Cisco IOS 12.3(10d)
  • Cisco IOS 12.3(12b)
  • Cisco IOS 12.3(13a)
  • Cisco IOS 12.3(3h)
  • Cisco IOS 12.3(5e)
  • Cisco IOS 12.3(6e)
  • Cisco IOS 12.3(9d)
  • Cisco IOS 12.3B
  • Cisco IOS 12.3BC
  • Cisco IOS 12.3BW
  • Cisco IOS 12.3JA
  • Cisco IOS 12.3JK
  • Cisco IOS 12.3T
  • Cisco IOS 12.3XA
  • Cisco IOS 12.3XB
  • Cisco IOS 12.3XC
  • Cisco IOS 12.3XD
  • Cisco IOS 12.3XE
  • Cisco IOS 12.3XF
  • Cisco IOS 12.3XG
  • Cisco IOS 12.3XH
  • Cisco IOS 12.3XI
  • Cisco IOS 12.3XJ
  • Cisco IOS 12.3XK
  • Cisco IOS 12.3XL
  • Cisco IOS 12.3XM
  • Cisco IOS 12.3XQ
  • Cisco IOS 12.3XR
  • Cisco IOS 12.3XS
  • Cisco IOS 12.3XU
  • Cisco IOS 12.3XW
  • Cisco IOS 12.3XY
  • Cisco IOS 12.3YA
  • Cisco IOS 12.3YD
  • Cisco IOS 12.3YF
  • Cisco IOS 12.3YG
  • Cisco IOS 12.3YI
  • Cisco IOS 12.3YJ
  • Cisco IOS 12.3YK
  • Cisco IOS 12.3YQ
  • Cisco IOS 12.3YS
  • Cisco IOS 12.3YT
  • Cisco IOS 12.3YU
  • Cisco IOS 12.3YW
  • Cisco IOS 12.4
  • Cisco IOS 12.4MR
  • Cisco IOS 12.4T

Recommendations

Block external access at the network boundary, unless external parties require service.

To exploit this vulnerability, an attacker must be able to establish a TCP connection to the affected device. Block external access to the device if possible. Only allow connections from trusted hosts and networks.

Deploy network intrusion detection systems to monitor network traffic for malicious activity.

Intrusion detection systems may detect attempts to exploit this and other latent vulnerabilities across the network. Examine IDS logs regularly for signs of attempted exploitation.
Cisco has released a security advisory and fixes to address this issue. Please see the referenced advisory for information on obtaining firmware updates from Cisco. Cisco has updated advisory 66269 to indicate that IOS 12.2ZH is not vulnerable to this issue and IOS 12.2SH are 12.2ZF versions are affected.

Credits

Announced by the vendor. Some details were provided by Markus .
Copyright © Symantec Corporation.
Permission to redistribute this alert electronically is granted as long as it is not edited in any way unless authorized by Symantec Security Response. Reprinting the whole or part of this alert in any medium other than electronically requires permission from secure@symantec.com.

Disclaimer
The information in the advisory is believed to be accurate at the time of publishing based on currently available information. Use of the information constitutes acceptance for use in an AS IS condition. There are no warranties with regard to this information. Neither the author nor the publisher accepts any liability for any direct, indirect, or consequential loss or damage arising from use of, or reliance on, this information.
Symantec, Symantec products, Symantec Security Response, and secure@symantec.com are registered trademarks of Symantec Corp. and/or affiliated companies in the United States and other countries. All other registered and unregistered trademarks represented in this document are the sole property of their respective companies/owners.

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