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Category:   Application (Web Server/CGI)  >   Apache HTTPD Vendors:   Apache Software Foundation
Apache Chunked Transfer-Encoding and Content-Length Processing Lets Remote Users Smuggle HTTP Requests
SecurityTracker Alert ID:  1014323
SecurityTracker URL:  http://securitytracker.com/id/1014323
CVE Reference:   CVE-2005-2088   (Links to External Site)
Updated:  Mar 2 2006
Original Entry Date:  Jun 29 2005
Impact:   Modification of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to 2.1.6
Description:   A vulnerability was reported in the Apache web server. A remote user may be able to conduct HTTP request smuggling attacks against web-based applications on the target system.

A remote user can submit a specially crafted request with both a 'Transfer-Encoding: chunked' header and a 'Content-Length' header to cause Apache to forward the reassembled request with the original Content-Length HTTP header value. As a result, a malicious request may be embedded within another request as processed by the subsequent application (such as an application server or a proxied system).

This vulnerability was reported by Watchfire.

A description of HTTP request smuggling attacks is available at:

http://www.watchfire.com/resources/HTTP-Request-Smuggling.pdf

Impact:   A remote user may be able to cause Apache to reassemble a connection in such a way that an application (such as an application server) to incorrectly process the connection.
Solution:   The vendor has issued a fixed version (2.1.6). A fix is also available for the 2.0 series in the Apache SVN repository.
Vendor URL:  httpd.apache.org/ (Links to External Site)
Cause:   State error
Underlying OS:  Linux (Any), UNIX (Any), Windows (Any)

Message History:   This archive entry has one or more follow-up message(s) listed below.
Jul 26 2005 (Red Hat Issues Fix) Apache Chunked Transfer-Encoding and Content-Length Processing Lets Remote Users Smuggle HTTP Requests
Red Hat has released a fix.
Nov 30 2005 (Apple Issues Fix) Apache Chunked Transfer-Encoding and Content-Length Processing Lets Remote Users Smuggle HTTP Requests
Apple has released a fix for Mac OS X.
Mar 2 2006 (Sun Issues Partial Fix) Apache Chunked Transfer-Encoding and Content-Length Processing Lets Remote Users Smuggle HTTP Requests
Sun has issued a fix for Solaris 9 and 10.
Mar 17 2006 (HP Issues Fix for HP-UX/Virtualvault) Apache Chunked Transfer-Encoding and Content-Length Processing Lets Remote Users Smuggle HTTP Requests
HP has issued a fix for Apache on HP-UX running Virtualvault.



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