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Category:   Application (Web Server/CGI)  >   Compaq Secure Web Server Vendors:   HPE
(HP Issues Fix for SWS) Apache Web Server Error in Processing Requests With Many Space Characters Lets Remote Users Deny Service
SecurityTracker Alert ID:  1012680
SecurityTracker URL:  http://securitytracker.com/id/1012680
CVE Reference:   CVE-2004-0942   (Links to External Site)
Date:  Dec 24 2004
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to 6.3.6a
Description:   A denial of service vulnerability was reported in the Apache web server. A remote user can consume excessive resources on the target system.

Chintan Trivedi reported that a remote user can submit multiple, specially crafted HTTP GET requests containing spaces to cause denial of service conditions on the target system.

The vendor later reported that the field length limit is not properly enforced for certain malicious requests.

A demonstration exploit request is provided:

GET / HTTP/1.0\n
[space] x 8000\n
[space] x 8000\n
[space] x 8000\n
.
.
8000 times

Impact:   A remote user can consume excessive resources on the target system.
Solution:   HP has issued a fixed version of the Secure Web Server (6.3.6a) for Tru64 UNIX, available at:

http://h30097.www3.hp.com/internet/download.htm

Cause:   Resource error
Underlying OS:  UNIX (Tru64)

Message History:   This archive entry is a follow-up to the message listed below.
Nov 4 2004 Apache Web Server Error in Processing Requests With Many Space Characters Lets Remote Users Deny Service



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