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Category:   Application (Web Server/CGI)  >   Apache Vendors:   Apache Software Foundation
(Red Hat Issues Fix) Apache mod_deflate Connection State Bug Lets Remote Users Deny Service
SecurityTracker Alert ID:  1022700
SecurityTracker URL:  http://securitytracker.com/id/1022700
CVE Reference:   CVE-2009-1891   (Links to External Site)
Date:  Aug 10 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:   Red Hat has released a fix.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2009-1205.html
Vendor URL:  httpd.apache.org/ (Links to External Site)
Cause:   State error
Underlying OS:   Linux (Red Hat Enterprise)

Message History:   This archive entry is a follow-up to the message listed below.
Jul 9 2009 Apache mod_deflate Connection State Bug Lets Remote Users Deny Service


 Source Message Contents
Date:  Mon, 10 Aug 2009 14:18:20 -0400
Subject:  [RHSA-2009:1205-01] Moderate: httpd security and bug fix update


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=====================================================================
                   Red Hat Security Advisory

Synopsis:          Moderate: httpd security and bug fix update
Advisory ID:       RHSA-2009:1205-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2009-1205.html
Issue date:        2009-08-10
CVE Names:         CVE-2009-1891 CVE-2009-2412 
=====================================================================

1. Summary:

Updated httpd packages that fix multiple security issues and a bug are now
available for Red Hat Enterprise Linux 3.

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

2. Relevant releases/architectures:

Red Hat Enterprise Linux AS version 3 - i386, ia64, ppc, s390, s390x, x86_64
Red Hat Desktop version 3 - i386, x86_64
Red Hat Enterprise Linux ES version 3 - i386, ia64, x86_64
Red Hat Enterprise Linux WS version 3 - i386, ia64, x86_64

3. Description:

The Apache HTTP Server is a popular Web server. The httpd package shipped
with Red Hat Enterprise Linux 3 contains embedded copies of the Apache
Portable Runtime (APR) libraries, which provide a free library of C data
structures and routines, and also additional utility interfaces to support
XML parsing, LDAP, database interfaces, URI parsing, and more.

Multiple integer overflow flaws, leading to heap-based buffer overflows,
were found in the way the Apache Portable Runtime (APR) manages memory pool
and relocatable memory allocations. An attacker could use these flaws to
issue a specially-crafted request for memory allocation, which would lead
to a denial of service (application crash) or, potentially, execute
arbitrary code with the privileges of an application using the APR
libraries. (CVE-2009-2412)

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)

This update also fixes the following bug:

* in some cases the Content-Length header was dropped from HEAD responses.
This resulted in certain sites not working correctly with mod_proxy, such
as www.windowsupdate.com. (BZ#506016)

All httpd users 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
http://kbase.redhat.com/faq/docs/DOC-11259

5. Bugs fixed (http://bugzilla.redhat.com/):

506016 - windowsupdate.microsoft.com does not work with mod_proxy
509125 - CVE-2009-1891 httpd: possible temporary DoS (CPU consumption) in mod_deflate
515698 - CVE-2009-2412 apr, apr-util: Integer overflows in memory pool (apr) and relocatable memory (apr-util) management

6. Package List:

Red Hat Enterprise Linux AS version 3:

Source:
ftp://updates.redhat.com/enterprise/3AS/en/os/SRPMS/httpd-2.0.46-75.ent.src.rpm

i386:
httpd-2.0.46-75.ent.i386.rpm
httpd-debuginfo-2.0.46-75.ent.i386.rpm
httpd-devel-2.0.46-75.ent.i386.rpm
mod_ssl-2.0.46-75.ent.i386.rpm

ia64:
httpd-2.0.46-75.ent.ia64.rpm
httpd-debuginfo-2.0.46-75.ent.ia64.rpm
httpd-devel-2.0.46-75.ent.ia64.rpm
mod_ssl-2.0.46-75.ent.ia64.rpm

ppc:
httpd-2.0.46-75.ent.ppc.rpm
httpd-debuginfo-2.0.46-75.ent.ppc.rpm
httpd-devel-2.0.46-75.ent.ppc.rpm
mod_ssl-2.0.46-75.ent.ppc.rpm

s390:
httpd-2.0.46-75.ent.s390.rpm
httpd-debuginfo-2.0.46-75.ent.s390.rpm
httpd-devel-2.0.46-75.ent.s390.rpm
mod_ssl-2.0.46-75.ent.s390.rpm

s390x:
httpd-2.0.46-75.ent.s390x.rpm
httpd-debuginfo-2.0.46-75.ent.s390x.rpm
httpd-devel-2.0.46-75.ent.s390x.rpm
mod_ssl-2.0.46-75.ent.s390x.rpm

x86_64:
httpd-2.0.46-75.ent.x86_64.rpm
httpd-debuginfo-2.0.46-75.ent.x86_64.rpm
httpd-devel-2.0.46-75.ent.x86_64.rpm
mod_ssl-2.0.46-75.ent.x86_64.rpm

Red Hat Desktop version 3:

Source:
ftp://updates.redhat.com/enterprise/3desktop/en/os/SRPMS/httpd-2.0.46-75.ent.src.rpm

i386:
httpd-2.0.46-75.ent.i386.rpm
httpd-debuginfo-2.0.46-75.ent.i386.rpm
httpd-devel-2.0.46-75.ent.i386.rpm
mod_ssl-2.0.46-75.ent.i386.rpm

x86_64:
httpd-2.0.46-75.ent.x86_64.rpm
httpd-debuginfo-2.0.46-75.ent.x86_64.rpm
httpd-devel-2.0.46-75.ent.x86_64.rpm
mod_ssl-2.0.46-75.ent.x86_64.rpm

Red Hat Enterprise Linux ES version 3:

Source:
ftp://updates.redhat.com/enterprise/3ES/en/os/SRPMS/httpd-2.0.46-75.ent.src.rpm

i386:
httpd-2.0.46-75.ent.i386.rpm
httpd-debuginfo-2.0.46-75.ent.i386.rpm
httpd-devel-2.0.46-75.ent.i386.rpm
mod_ssl-2.0.46-75.ent.i386.rpm

ia64:
httpd-2.0.46-75.ent.ia64.rpm
httpd-debuginfo-2.0.46-75.ent.ia64.rpm
httpd-devel-2.0.46-75.ent.ia64.rpm
mod_ssl-2.0.46-75.ent.ia64.rpm

x86_64:
httpd-2.0.46-75.ent.x86_64.rpm
httpd-debuginfo-2.0.46-75.ent.x86_64.rpm
httpd-devel-2.0.46-75.ent.x86_64.rpm
mod_ssl-2.0.46-75.ent.x86_64.rpm

Red Hat Enterprise Linux WS version 3:

Source:
ftp://updates.redhat.com/enterprise/3WS/en/os/SRPMS/httpd-2.0.46-75.ent.src.rpm

i386:
httpd-2.0.46-75.ent.i386.rpm
httpd-debuginfo-2.0.46-75.ent.i386.rpm
httpd-devel-2.0.46-75.ent.i386.rpm
mod_ssl-2.0.46-75.ent.i386.rpm

ia64:
httpd-2.0.46-75.ent.ia64.rpm
httpd-debuginfo-2.0.46-75.ent.ia64.rpm
httpd-devel-2.0.46-75.ent.ia64.rpm
mod_ssl-2.0.46-75.ent.ia64.rpm

x86_64:
httpd-2.0.46-75.ent.x86_64.rpm
httpd-debuginfo-2.0.46-75.ent.x86_64.rpm
httpd-devel-2.0.46-75.ent.x86_64.rpm
mod_ssl-2.0.46-75.ent.x86_64.rpm

These packages are GPG signed by Red Hat for security.  Our key and 
details on how to verify the signature are available from
https://www.redhat.com/security/team/key/#package

7. References:

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-1891
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-2412
http://www.redhat.com/security/updates/classification/#moderate

8. Contact:

The Red Hat security contact is <secalert@redhat.com>.  More contact
details at https://www.redhat.com/security/team/contact/

Copyright 2009 Red Hat, Inc.
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