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Category:   Application (Web Server/CGI)  >   Apache Vendors:   Apache Software Foundation
(Red Hat Issues Fix) Apache httpd Byterange Filter Processing Error Lets Remote Users Deny Service
SecurityTracker Alert ID:  1026050
SecurityTracker URL:  http://securitytracker.com/id/1026050
CVE Reference:   CVE-2011-3192   (Links to External Site)
Date:  Sep 14 2011
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  Exploit Included:  Yes  

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

A remote user can send specially crafted requests to cause the HTTP byterange filter code to consume excessive memory on the target system. This may cause the target system to become unstable.

The 'Range' and 'Range-Request' headers are affected.

This vulnerability is being actively exploited.

A demonstration exploit is available at:

http://www.exploit-db.com/exploits/17696/

Kingcope reported this vulnerability.
Impact:   A remote user can cause the target system to become unstable.
Solution:   Red Hat has issued a fix.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2011-1294.html
Vendor URL:  httpd.apache.org/ (Links to External Site)
Cause:   Resource error
Underlying OS:   Linux (Red Hat Enterprise)

Message History:   This archive entry is a follow-up to the message listed below.
Aug 22 2011 Apache httpd Byterange Filter Processing Error Lets Remote Users Deny Service


 Source Message Contents
Date:  Wed, 14 Sep 2011 19:09:42 +0000
Subject:  [RHSA-2011:1294-01] Important: httpd security update

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

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

Synopsis:          Important: httpd security update
Advisory ID:       RHSA-2011:1294-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2011-1294.html
Issue date:        2011-09-14
CVE Names:         CVE-2011-3192 
=====================================================================

1. Summary:

Updated httpd packages that fix one security issue are now available for
Red Hat Enterprise Linux 5.3 Long Life, 5.6 Extended Update Support, and
6.0 Extended Update Support.

The Red Hat Security Response Team has rated this update as having
important security impact. A Common Vulnerability Scoring System (CVSS)
base score, which gives a detailed severity rating, is available from the
CVE link in the References section.

2. Relevant releases/architectures:

Red Hat Enterprise Linux (v. 5 server) - i386, ia64, ppc, s390x, x86_64
Red Hat Enterprise Linux (v. 5.3.LL server) - i386, ia64, x86_64
Red Hat Enterprise Linux Server (v. 6.0.z) - i386, noarch, ppc64, s390x, x86_64

3. Description:

The Apache HTTP Server is a popular web server.

A flaw was found in the way the Apache HTTP Server handled Range HTTP
headers. A remote attacker could use this flaw to cause httpd to use an
excessive amount of memory and CPU time via HTTP requests with a
specially-crafted Range header. (CVE-2011-3192)

All httpd users should upgrade to these updated packages, which contain a
backported patch to correct this issue. 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 all previously-released errata
relevant to your system have been applied.

This update is available via the Red Hat Network. Details on how to
use the Red Hat Network to apply this update are available at
https://access.redhat.com/kb/docs/DOC-11259

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

732928 - CVE-2011-3192 httpd: multiple ranges DoS

6. Package List:

Red Hat Enterprise Linux (v. 5.3.LL server):

Source:
httpd-2.2.3-22.el5_3.3.src.rpm

i386:
httpd-2.2.3-22.el5_3.3.i386.rpm
httpd-debuginfo-2.2.3-22.el5_3.3.i386.rpm
httpd-devel-2.2.3-22.el5_3.3.i386.rpm
httpd-manual-2.2.3-22.el5_3.3.i386.rpm
mod_ssl-2.2.3-22.el5_3.3.i386.rpm

ia64:
httpd-2.2.3-22.el5_3.3.ia64.rpm
httpd-debuginfo-2.2.3-22.el5_3.3.ia64.rpm
httpd-devel-2.2.3-22.el5_3.3.ia64.rpm
httpd-manual-2.2.3-22.el5_3.3.ia64.rpm
mod_ssl-2.2.3-22.el5_3.3.ia64.rpm

x86_64:
httpd-2.2.3-22.el5_3.3.x86_64.rpm
httpd-debuginfo-2.2.3-22.el5_3.3.i386.rpm
httpd-debuginfo-2.2.3-22.el5_3.3.x86_64.rpm
httpd-devel-2.2.3-22.el5_3.3.i386.rpm
httpd-devel-2.2.3-22.el5_3.3.x86_64.rpm
httpd-manual-2.2.3-22.el5_3.3.x86_64.rpm
mod_ssl-2.2.3-22.el5_3.3.x86_64.rpm

Red Hat Enterprise Linux (v. 5 server):

Source:
httpd-2.2.3-45.el5_6.2.src.rpm

i386:
httpd-2.2.3-45.el5_6.2.i386.rpm
httpd-debuginfo-2.2.3-45.el5_6.2.i386.rpm
httpd-devel-2.2.3-45.el5_6.2.i386.rpm
httpd-manual-2.2.3-45.el5_6.2.i386.rpm
mod_ssl-2.2.3-45.el5_6.2.i386.rpm

ia64:
httpd-2.2.3-45.el5_6.2.ia64.rpm
httpd-debuginfo-2.2.3-45.el5_6.2.ia64.rpm
httpd-devel-2.2.3-45.el5_6.2.ia64.rpm
httpd-manual-2.2.3-45.el5_6.2.ia64.rpm
mod_ssl-2.2.3-45.el5_6.2.ia64.rpm

ppc:
httpd-2.2.3-45.el5_6.2.ppc.rpm
httpd-debuginfo-2.2.3-45.el5_6.2.ppc.rpm
httpd-debuginfo-2.2.3-45.el5_6.2.ppc64.rpm
httpd-devel-2.2.3-45.el5_6.2.ppc.rpm
httpd-devel-2.2.3-45.el5_6.2.ppc64.rpm
httpd-manual-2.2.3-45.el5_6.2.ppc.rpm
mod_ssl-2.2.3-45.el5_6.2.ppc.rpm

s390x:
httpd-2.2.3-45.el5_6.2.s390x.rpm
httpd-debuginfo-2.2.3-45.el5_6.2.s390.rpm
httpd-debuginfo-2.2.3-45.el5_6.2.s390x.rpm
httpd-devel-2.2.3-45.el5_6.2.s390.rpm
httpd-devel-2.2.3-45.el5_6.2.s390x.rpm
httpd-manual-2.2.3-45.el5_6.2.s390x.rpm
mod_ssl-2.2.3-45.el5_6.2.s390x.rpm

x86_64:
httpd-2.2.3-45.el5_6.2.x86_64.rpm
httpd-debuginfo-2.2.3-45.el5_6.2.i386.rpm
httpd-debuginfo-2.2.3-45.el5_6.2.x86_64.rpm
httpd-devel-2.2.3-45.el5_6.2.i386.rpm
httpd-devel-2.2.3-45.el5_6.2.x86_64.rpm
httpd-manual-2.2.3-45.el5_6.2.x86_64.rpm
mod_ssl-2.2.3-45.el5_6.2.x86_64.rpm

Red Hat Enterprise Linux Server (v. 6.0.z):

Source:
httpd-2.2.15-5.el6_0.1.src.rpm

i386:
httpd-2.2.15-5.el6_0.1.i686.rpm
httpd-debuginfo-2.2.15-5.el6_0.1.i686.rpm
httpd-devel-2.2.15-5.el6_0.1.i686.rpm
httpd-tools-2.2.15-5.el6_0.1.i686.rpm
mod_ssl-2.2.15-5.el6_0.1.i686.rpm

noarch:
httpd-manual-2.2.15-5.el6_0.1.noarch.rpm

ppc64:
httpd-2.2.15-5.el6_0.1.ppc64.rpm
httpd-debuginfo-2.2.15-5.el6_0.1.ppc.rpm
httpd-debuginfo-2.2.15-5.el6_0.1.ppc64.rpm
httpd-devel-2.2.15-5.el6_0.1.ppc.rpm
httpd-devel-2.2.15-5.el6_0.1.ppc64.rpm
httpd-tools-2.2.15-5.el6_0.1.ppc64.rpm
mod_ssl-2.2.15-5.el6_0.1.ppc64.rpm

s390x:
httpd-2.2.15-5.el6_0.1.s390x.rpm
httpd-debuginfo-2.2.15-5.el6_0.1.s390.rpm
httpd-debuginfo-2.2.15-5.el6_0.1.s390x.rpm
httpd-devel-2.2.15-5.el6_0.1.s390.rpm
httpd-devel-2.2.15-5.el6_0.1.s390x.rpm
httpd-tools-2.2.15-5.el6_0.1.s390x.rpm
mod_ssl-2.2.15-5.el6_0.1.s390x.rpm

x86_64:
httpd-2.2.15-5.el6_0.1.x86_64.rpm
httpd-debuginfo-2.2.15-5.el6_0.1.i686.rpm
httpd-debuginfo-2.2.15-5.el6_0.1.x86_64.rpm
httpd-devel-2.2.15-5.el6_0.1.i686.rpm
httpd-devel-2.2.15-5.el6_0.1.x86_64.rpm
httpd-tools-2.2.15-5.el6_0.1.x86_64.rpm
mod_ssl-2.2.15-5.el6_0.1.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://access.redhat.com/security/team/key/#package

7. References:

https://www.redhat.com/security/data/cve/CVE-2011-3192.html
https://access.redhat.com/security/updates/classification/#important

8. Contact:

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

Copyright 2011 Red Hat, Inc.
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