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Cisco IOS IPS Security Bypass and Denial of Service
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Secunia Advisory:
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SA24142
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Release Date:
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2007-02-14
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Last Update:
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2007-02-16
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Popularity:
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8,786 views
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Critical:
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Moderately critical
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Impact:
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Security Bypass
DoS
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Where:
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From remote
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Solution Status:
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Vendor Patch
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| OS: | Cisco IOS 12.x
Cisco IOS R12.x
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Subscribe:
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| CVE reference: | CVE-2007-0917
CVE-2007-0918
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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
Changelog:
2007-02-16: Added CVE reference.
Original Advisory:
http://www.cisco.com/warp/public/707/cisco-sa-20070213-iosips.shtml
http://www.cisco.com/en/US/products/p...ecurity_response09186a00807e0a5e.html
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Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
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