Telecom Trendz

A vulnerability with Cisco routers when access lists are utilized. This vulnerability is present in Cisco software releases 8.2, 8.3, 9.0 and 9.1. From my personal point of view i personally strongly recommend that sites using Cisco routers for firewalls take immediate action to eliminate this vulnerability from their networks.

This vulnerability is fixed in Cisco software releases 8.3 (update 5.10), 9.0 (update 2.5), 9.1 (update 1.1) and in all later releases. Administrators who are using software release 8.2 and do not want to upgrade to a later release should contact Cisco’s Technical Assistance Center (TAC) at 800-553-2447 (Internet: tac@cisco.com) for more information.

The following interim releases are available
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Release (Update) Filename Size Checksum
8.3 (5.10) /beta83_dir/gs3-bfx.83-5.10 1234696 02465 1206
9.0 (2.5) /beta90_dir/gs3-bfx.90-2.5 1705364 47092 1666
9.1 (1.1) /beta91_dir/gs3-k.91-1.1 2005548 59407 1959

These releases are also available on Cisco’s Customer Information On-Line (CIO) service for those having a maintenance contract.Other customers may obtain these releases through Cisco’s Technical Assistance Center or by contacting their local Cisco distributor.

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I. Description

A vulnerability in Cisco access lists allows some packets to be erroneously routed which one would expect to be filtered by the access list and vice-versa. This vulnerability can allow unauthorized traffic to pass through the gateway and can block authorized traffic.

II. Problem

If a Cisco router is configured to use extended IP access lists for traffic filtering on an MCI, SCI, cBus or cBusII interface, and the IP route cache is enabled, and the “established” keyword is used in the access list, then the access list can be improperly evaluated. This can permit packets which should be filtered and filter packets which should be permitted.

III. Workaround

This vulnerability can be avoided by either rewriting the extended access list to not use the “established” keyword, or by configuring the interface to not use the IP route cache. To disable the IP route cache, use the configuration command “no ip route-cache”.

Example for a serial interface:
router>enable

Password:
router#configure terminal

Enter configuration commands, one per line.
Edit with DELETE, CTRL/W, and CTRL/U; end with CTRL/Z
interface serial 0
no ip route-cache
^Z
router#write memory

IV. Solution

Obtain and install the appropriate interim release listed above. Sites which are not experienced at this installation process
should contact the TAC center at 800-553-2447 for assistance.

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