[ISN] Cisco Warns Of Multiple IOS Vulnerabilities

From: InfoSec News (alerts@private)
Date: Tue Feb 13 2007 - 22:29:24 PST


By Sharon Gaudin
Feb 13, 2007 

Cisco Systems announced on Tuesday that there are several 
vulnerabilities in the Intrusion Prevention System (IPS) feature set of 
its Internetwork Operating System (IOS).

Fragmented IP packets may be used to evade signature inspection, 
according to a warning on Cisco's Web site [1]. It also warned that the 
IPS signatures utilizing the regular expression feature of the 
ATOMIC.TCP signature engine may cause a router to crash and resulting in 
a denial of service.

Cisco's IOS is software used in a lot of its routers and current network 

Four versions of Cisco IOS are vulnerable to the fragmented packet 
evasion vulnerability. They include Version 12.4, 12.4T, 12.4XE, and at 
least one release of 12.3T. Many of the IOS version releases are 
vulnerable to the ATOMIC.TCP regular expression denial of service flaw.

An alert on the SANS Institute's Internet Storm Center recommends an 
upgrade of the IOS version.

[1] http://www.cisco.com/warp/public/707/cisco-sa-20070213-iosips.shtml

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