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 . 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.
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