Secunia Security Advisory - 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).
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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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