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Secunia is proud to announce the availability of the Secunia Software
Inspector.

The Secunia Software Inspector is a free service that detects insecure
versions of software that you may have installed in your system. When
insecure versions are detected, the Secunia Software Inspector also
provides thorough guidelines for updating the software to the latest
secure version from the vendor.

Try it out online:
http://secunia.com/software_inspector/

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TITLE:
Cisco IOS IPS Security Bypass and Denial of Service

SECUNIA ADVISORY ID:
SA24142

VERIFY ADVISORY:
http://secunia.com/advisories/24142/

CRITICAL:
Moderately critical

IMPACT:
Security Bypass, DoS

WHERE:
>From remote

OPERATING SYSTEM:
Cisco IOS R12.x
http://secunia.com/product/50/
Cisco IOS 12.x
http://secunia.com/product/182/

DESCRIPTION:
Two vulnerabilities have been reported in Cisco IOS, which can be
exploited by malicious people to bypass certain security restrictions
or cause a DoS (Denial of Service).

1) Cisco IOS IPS signatures using regular expressions may not
correctly identify malicious traffic within fragmented IP packets.
This can be exploited to bypass the detection mechanism by sending
specially crafted, fragmented IP packets.

2) An error exists within the ATOMIC.TCP scanning mechanism and
signatures, which use regular expressions (e.g. Signature 3123.0 for
Netbus Pro Traffic). This can be exploited to crash a device by
producing specially crafted network traffic.

SOLUTION:
See the vendor advisory for a patch matrix and workarounds.

PROVIDED AND/OR DISCOVERED BY:
Reported by the vendor

ORIGINAL ADVISORY:
http://www.cisco.com/warp/public/707/cisco-sa-20070213-iosips.shtml
http://www.cisco.com/en/US/products/products_security_response09186a00807e0a5e.html

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About:
This Advisory was delivered by Secunia as a free service to help
everybody keeping their systems up to date against the latest
vulnerabilities.

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Definitions: (Criticality, Where etc.)
http://secunia.com/about_secunia_advisories/


Please Note:
Secunia recommends that you verify all advisories you receive by
clicking the link.
Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.

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