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Cisco Security

Shell Code in HTTP URL / Args

 
Signature ID: 5366/0
Original Release:S46
Release:S256 (download)
Original Release Date:2003 May 30
Latest Release Date:2006 October 30
Default Enabled:False
Default Retired:True
CVE:CVE-2003-0109 , CVE-2004-0039 , CVE-2005-1471 , CVE-2006-3733
BugTraq ID:19071 , 19075
Alarm Severity:High
Fidelity:85 

Description

This signature fires when a non-printable ASCII character (128-255) is detected in the URL (SubSig 0) or arguments (SubSig 1) of a HTTP request. The URL and arguments of a HTTP request should not contain any non-printable characters, which may indicate the precense of shell (machine) code used in a buffer overflow attack.

Recommended Filter

No recommended filters.

Benign Triggers

Due to architectural limitations discovered in the 3.x sensor platform, this signature, as of signature update S44, has been disabled in the 3.x sensor configuration to prevent false excessive false positive alarms. This setting is not user modifiable. For 4.x sensors, this signature has been disabled by default. It is recommended that it remain disabled because of excessive false postive alarms that may result. This problem will be dealt with in a future 4.x release.

IntelliShield Alerts

Download

To download this and other IPS update files, please go to Cisco Secure Software Download.

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