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
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Subject: Cisco IOS IPS Security Bypass and Denial of Service
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