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Category:   Application (Web Server/CGI)  >   Red Hat JBoss Vendors:   Red Hat
(Red Hat Issues Fix for JBoss Enterprise Web Server) Apache mod_proxy stream_reqbody_cl() Infinite Loop Lets Remote Users Deny Service
SecurityTracker Alert ID:  1022558
SecurityTracker URL:
CVE Reference:   CVE-2009-1890   (Links to External Site)
Date:  Jul 15 2009
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in Apache mod_proxy. A remote user can cause denial of service conditions. JBoss Enterprise Web Server is affected.

A remote user can send specially crafted Content-Length value to cause the stream_reqbody_cl() function in 'modules/proxy/mod_proxy_http.c' to enter an infinite loop.

Impact:   A remote user can cause the target service to enter an infinite loop.
Solution:   Red Hat has released a fix for JBoss Enterprise Web Server, which is affected by this vulnerability.

The Red Hat advisory is available at:

Cause:   State error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  5

Message History:   This archive entry is a follow-up to the message listed below.
Jul 3 2009 Apache mod_proxy stream_reqbody_cl() Infinite Loop Lets Remote Users Deny Service

 Source Message Contents

Subject:  [RHSA-2009:1155-01] Important: httpd security update

Hash: SHA1

                   Red Hat Security Advisory

Synopsis:          Important: httpd security update
Advisory ID:       RHSA-2009:1155-01
Product:           JBoss Enterprise Web Server
Advisory URL:
Issue date:        2009-07-14
CVE Names:         CVE-2009-1195 CVE-2009-1890 CVE-2009-1891 

1. Summary:

Updated httpd packages that fix multiple security issues are now available
for JBoss Enterprise Web Server 1.0.0 for Red Hat Enterprise Linux 5.

This update has been rated as having important security impact by the Red
Hat Security Response Team.

2. Relevant releases/architectures:

JBoss Enterprise Web Server 5Server-JBEWS-5.0.0 - i386, x86_64

3. Description:

The Apache HTTP Server is a popular Web server.

A denial of service flaw was found in the Apache mod_proxy module when it
was used as a reverse proxy. A remote attacker could use this flaw to force
a proxy process to consume large amounts of CPU time. (CVE-2009-1890)

A flaw was found in the handling of the "Options" and "AllowOverride"
directives used by the Apache HTTP Server. In configurations using the
"AllowOverride" directive with certain "Options=" arguments, local users
were not restricted from executing commands from a Server-Side-Include
script as intended. (CVE-2009-1195)

A denial of service flaw was found in the Apache mod_deflate module. This
module continued to compress large files until compression was complete,
even if the network connection that requested the content was closed before
compression completed. This would cause mod_deflate to consume large
amounts of CPU if mod_deflate was enabled for a large file. (CVE-2009-1891)

All users of JBoss Enterprise Web Server 1.0.0 should upgrade to these
updated packages, which contain backported patches to correct these issues.
After installing the updated packages, the httpd daemon must be restarted
for the update to take effect.

4. Solution:

Before applying this update, make sure that all previously-released
errata relevant to your system have been applied.

This update is available via Red Hat Network.  Details on how to use
the Red Hat Network to apply this update are available at

5. Bugs fixed (

489436 - CVE-2009-1195 AllowOverride Options=IncludesNoExec allows Options Includes
509125 - CVE-2009-1891 httpd: possible temporary DoS (CPU consumption) in mod_deflate
509375 - CVE-2009-1890 httpd: mod_proxy reverse proxy DoS (infinite loop)

6. Package List:

JBoss Enterprise Web Server 5Server-JBEWS-5.0.0:




These packages are GPG signed by Red Hat for security.  Our key and 
details on how to verify the signature are available from

7. References:

8. Contact:

The Red Hat security contact is <>.  More contact
details at

Copyright 2009 Red Hat, Inc.
Version: GnuPG v1.4.4 (GNU/Linux)


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