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Category:   Application (Web Server/CGI)  >   Apache HTTPD Vendors:   Apache Software Foundation
Apache mod_deflate Connection State Bug Lets Remote Users Deny Service
SecurityTracker Alert ID:  1022529
SecurityTracker URL:  http://securitytracker.com/id/1022529
CVE Reference:   CVE-2009-1891   (Links to External Site)
Date:  Jul 9 2009
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in Apache mod_deflate. A remote user can cause denial of service conditions.

The mod_deflate module continues to compress large files after the network connection has been closed. A remote user can send specially crafted data to cause the target service to consume excessive CPU resources for a temporary period of time.

Francois Guerraz reported this vulnerability.

Impact:   A remote user can cause the target system to consume excessive CPU resources.
Solution:   The vendor has issued a source code fix, available at:

http://svn.apache.org/viewvc/httpd/httpd/branches/2.2.x/server/core_filters.c?r1=421103&r2=791454&pathrev=791454&view=patch

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 9 2009 (Red Hat Issues Fix) Apache mod_deflate Connection State Bug Lets Remote Users Deny Service
Red Hat has released a fix for Red Hat Enterprise Linux 5.
Jul 14 2009 (Red Hat Issues Fix) Apache mod_deflate Connection State Bug Lets Remote Users Deny Service
Red Hat has released a fix for Red Hat Application Stack v2.
Jul 15 2009 (Red Hat Issues Fix for JBoss Enterprise Web Server) Apache mod_deflate Connection State Bug Lets Remote Users Deny Service
Red Hat has released a fix for JBoss Enterprise Web Server 1.0.0 for Red Hat Enterprise Linux 5.
Jul 17 2009 (Red Hat Issues Fix for JBoss) Apache mod_deflate Connection State Bug Lets Remote Users Deny Service
Red Hat has released a fix for JBoss Enterprise Web Server 1.0.0 for Red Hat Enterprise Linux 4.
Aug 10 2009 (Red Hat Issues Fix) Apache mod_deflate Connection State Bug Lets Remote Users Deny Service
Red Hat has released a fix for Red Hat Enterprise Linux 3.
Oct 16 2010 (Sun Issues Fix) Apache mod_deflate Connection State Bug Lets Remote Users Deny Service
Sun has issued a fix for Solaris 10 and OpenSolaris.
May 2 2011 (Oracle Issues Fix for Solaris) Apache mod_deflate Connection State Bug Lets Remote Users Deny Service
Oracle has issued a fix for Solaris 10 and OpenSolaris.



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