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Moderately critical

Cisco IOS IPS Security Bypass and Denial of Service

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Release Date:  2007-02-14    Last Update:  2007-02-16    Views:  13,374

Secunia Advisory SA24142

Where:

From remote

Impact:

Security Bypass, DoS

Solution Status:

Vendor Patch

CVE Reference(s):

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

Deep Links:
Links available to Secunia VIM customers

Do you have additional information related to this advisory?

Please provide information about patches, mitigating factors, new versions, exploits, faulty patches, links, and other relevant data by posting comments to this Advisory. You can also send this information to vuln@secunia.com

Subject: Cisco IOS IPS Security Bypass and Denial of Service

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