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.
No recommended filters.
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.
LEGAL DISCLAIMER THE INFORMATION ON THIS PAGE IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE INFORMATION CONTAINED HEREIN, OR MATERIALS LINKED FROM THE DOCUMENT, IS AT YOUR OWN RISK. INFORMATION IN THIS DOCUMENT AND ANY RELATED COMMUNICATIONS IS BASED ON OUR KNOWLEDGE AT THE TIME OF PUBLICATION AND IS SUBJECT TO CHANGE WITHOUT NOTICE. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME.