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TITLE:
Cisco Products HTTP Unicode Encoding Detection Bypass

SECUNIA ADVISORY ID:
SA25285

VERIFY ADVISORY:
http://secunia.com/advisories/25285/

CRITICAL:
Less critical

IMPACT:
Security Bypass

WHERE:
>From remote

OPERATING SYSTEM:
Cisco Intrusion Prevention System (IPS) 5.x
http://secunia.com/product/5600/

SOFTWARE:
Cisco IOS Firewall Feature Set 12.x
http://secunia.com/product/721/
Cisco IOS Firewall Feature Set 11.x
http://secunia.com/product/722/

DESCRIPTION:
A vulnerability has been reported in various Cisco products, which
can be exploited by malicious people to bypass certain security
restrictions.

The vulnerability is caused due to an error in the handling of
full-width and half-width unicode encoded HTTP traffic. This can be
exploited to bypass content scanning and evade detection by an IPS or
firewall.

The vulnerability affects the following products:
* Cisco Intrusion Prevention System (IPS)
* Cisco IOS with Firewall/IPS Feature Set

SOLUTION:
No fix or workaround is currently available.

PROVIDED AND/OR DISCOVERED BY:
Fatih Ozavci and Caglar Cakici, GamaSEC

ORIGINAL ADVISORY:
Cisco:
http://www.cisco.com/warp/public/707/cisco-sr-20070514-unicode.shtml

GamaSEC:
http://www.gamasec.net/english/gs07-01.html

OTHER REFERENCES:
US-CERT VU#739224:
http://www.kb.cert.org/vuls/id/739224

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