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Category:   Application (Generic)  >   Libxml2 Vendors:   xmlsoft.org
(Red Hat Issues Fix) Libxml2 Hash Table Collision Bug Lets Remote Users Deny Service
SecurityTracker Alert ID:  1026725
SecurityTracker URL:  http://securitytracker.com/id/1026725
CVE Reference:   CVE-2012-0841   (Links to External Site)
Date:  Feb 22 2012
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in Libxml2. A remote user can cause denial of service conditions.

A remote user can send a specially crafted message to cause the target XML service to consume excessive CPU resources by causing hash table collisions.

Juraj Somorovsky reported this vulnerability.

Impact:   A remote user can consume excessive CPU resources on the target system.
Solution:   Red Hat has issued a fix.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2012-0324.html

Vendor URL:  xmlsoft.org/ (Links to External Site)
Cause:   State error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  5, 6

Message History:   This archive entry is a follow-up to the message listed below.
Feb 22 2012 Libxml2 Hash Table Collision Bug Lets Remote Users Deny Service



 Source Message Contents

Subject:  [RHSA-2012:0324-01] Moderate: libxml2 security update

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

Synopsis:          Moderate: libxml2 security update
Advisory ID:       RHSA-2012:0324-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2012-0324.html
Issue date:        2012-02-21
CVE Names:         CVE-2012-0841 
=====================================================================

1. Summary:

Updated libxml2 packages that fix one security issue are now available for
Red Hat Enterprise Linux 5 and 6.

The Red Hat Security Response Team has rated this update as having moderate
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:

RHEL Desktop Workstation (v. 5 client) - i386, x86_64
Red Hat Enterprise Linux (v. 5 server) - i386, ia64, ppc, s390x, x86_64
Red Hat Enterprise Linux Desktop (v. 5 client) - i386, x86_64
Red Hat Enterprise Linux Desktop (v. 6) - i386, x86_64
Red Hat Enterprise Linux Desktop Optional (v. 6) - i386, x86_64
Red Hat Enterprise Linux HPC Node (v. 6) - x86_64
Red Hat Enterprise Linux HPC Node Optional (v. 6) - x86_64
Red Hat Enterprise Linux Server (v. 6) - i386, ppc64, s390x, x86_64
Red Hat Enterprise Linux Server Optional (v. 6) - i386, ppc64, s390x, x86_64
Red Hat Enterprise Linux Workstation (v. 6) - i386, x86_64
Red Hat Enterprise Linux Workstation Optional (v. 6) - i386, x86_64

3. Description:

The libxml2 library is a development toolbox providing the implementation
of various XML standards.

It was found that the hashing routine used by libxml2 arrays was
susceptible to predictable hash collisions. Sending a specially-crafted
message to an XML service could result in longer processing time, which
could lead to a denial of service. To mitigate this issue, randomization
has been added to the hashing function to reduce the chance of an attacker
successfully causing intentional collisions. (CVE-2012-0841)

All users of libxml2 are advised to upgrade to these updated packages,
which contain a backported patch to correct this issue. The desktop must
be restarted (log out, then log back in) for this 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/):

787067 - CVE-2012-0841 libxml2: hash table collisions CPU usage DoS

6. Package List:

Red Hat Enterprise Linux Desktop (v. 5 client):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/libxml2-2.6.26-2.1.15.el5_8.2.src.rpm

i386:
libxml2-2.6.26-2.1.15.el5_8.2.i386.rpm
libxml2-debuginfo-2.6.26-2.1.15.el5_8.2.i386.rpm
libxml2-python-2.6.26-2.1.15.el5_8.2.i386.rpm

x86_64:
libxml2-2.6.26-2.1.15.el5_8.2.i386.rpm
libxml2-2.6.26-2.1.15.el5_8.2.x86_64.rpm
libxml2-debuginfo-2.6.26-2.1.15.el5_8.2.i386.rpm
libxml2-debuginfo-2.6.26-2.1.15.el5_8.2.x86_64.rpm
libxml2-python-2.6.26-2.1.15.el5_8.2.x86_64.rpm

RHEL Desktop Workstation (v. 5 client):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/libxml2-2.6.26-2.1.15.el5_8.2.src.rpm

i386:
libxml2-debuginfo-2.6.26-2.1.15.el5_8.2.i386.rpm
libxml2-devel-2.6.26-2.1.15.el5_8.2.i386.rpm

x86_64:
libxml2-debuginfo-2.6.26-2.1.15.el5_8.2.i386.rpm
libxml2-debuginfo-2.6.26-2.1.15.el5_8.2.x86_64.rpm
libxml2-devel-2.6.26-2.1.15.el5_8.2.i386.rpm
libxml2-devel-2.6.26-2.1.15.el5_8.2.x86_64.rpm

Red Hat Enterprise Linux (v. 5 server):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/os/SRPMS/libxml2-2.6.26-2.1.15.el5_8.2.src.rpm

i386:
libxml2-2.6.26-2.1.15.el5_8.2.i386.rpm
libxml2-debuginfo-2.6.26-2.1.15.el5_8.2.i386.rpm
libxml2-devel-2.6.26-2.1.15.el5_8.2.i386.rpm
libxml2-python-2.6.26-2.1.15.el5_8.2.i386.rpm

ia64:
libxml2-2.6.26-2.1.15.el5_8.2.i386.rpm
libxml2-2.6.26-2.1.15.el5_8.2.ia64.rpm
libxml2-debuginfo-2.6.26-2.1.15.el5_8.2.i386.rpm
libxml2-debuginfo-2.6.26-2.1.15.el5_8.2.ia64.rpm
libxml2-devel-2.6.26-2.1.15.el5_8.2.ia64.rpm
libxml2-python-2.6.26-2.1.15.el5_8.2.ia64.rpm

ppc:
libxml2-2.6.26-2.1.15.el5_8.2.ppc.rpm
libxml2-2.6.26-2.1.15.el5_8.2.ppc64.rpm
libxml2-debuginfo-2.6.26-2.1.15.el5_8.2.ppc.rpm
libxml2-debuginfo-2.6.26-2.1.15.el5_8.2.ppc64.rpm
libxml2-devel-2.6.26-2.1.15.el5_8.2.ppc.rpm
libxml2-devel-2.6.26-2.1.15.el5_8.2.ppc64.rpm
libxml2-python-2.6.26-2.1.15.el5_8.2.ppc.rpm

s390x:
libxml2-2.6.26-2.1.15.el5_8.2.s390.rpm
libxml2-2.6.26-2.1.15.el5_8.2.s390x.rpm
libxml2-debuginfo-2.6.26-2.1.15.el5_8.2.s390.rpm
libxml2-debuginfo-2.6.26-2.1.15.el5_8.2.s390x.rpm
libxml2-devel-2.6.26-2.1.15.el5_8.2.s390.rpm
libxml2-devel-2.6.26-2.1.15.el5_8.2.s390x.rpm
libxml2-python-2.6.26-2.1.15.el5_8.2.s390x.rpm

x86_64:
libxml2-2.6.26-2.1.15.el5_8.2.i386.rpm
libxml2-2.6.26-2.1.15.el5_8.2.x86_64.rpm
libxml2-debuginfo-2.6.26-2.1.15.el5_8.2.i386.rpm
libxml2-debuginfo-2.6.26-2.1.15.el5_8.2.x86_64.rpm
libxml2-devel-2.6.26-2.1.15.el5_8.2.i386.rpm
libxml2-devel-2.6.26-2.1.15.el5_8.2.x86_64.rpm
libxml2-python-2.6.26-2.1.15.el5_8.2.x86_64.rpm

Red Hat Enterprise Linux Desktop (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Client/en/os/SRPMS/libxml2-2.7.6-4.el6_2.4.src.rpm

i386:
libxml2-2.7.6-4.el6_2.4.i686.rpm
libxml2-debuginfo-2.7.6-4.el6_2.4.i686.rpm
libxml2-python-2.7.6-4.el6_2.4.i686.rpm

x86_64:
libxml2-2.7.6-4.el6_2.4.i686.rpm
libxml2-2.7.6-4.el6_2.4.x86_64.rpm
libxml2-debuginfo-2.7.6-4.el6_2.4.i686.rpm
libxml2-debuginfo-2.7.6-4.el6_2.4.x86_64.rpm
libxml2-python-2.7.6-4.el6_2.4.x86_64.rpm

Red Hat Enterprise Linux Desktop Optional (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Client/en/os/SRPMS/libxml2-2.7.6-4.el6_2.4.src.rpm

i386:
libxml2-debuginfo-2.7.6-4.el6_2.4.i686.rpm
libxml2-devel-2.7.6-4.el6_2.4.i686.rpm
libxml2-static-2.7.6-4.el6_2.4.i686.rpm

x86_64:
libxml2-debuginfo-2.7.6-4.el6_2.4.i686.rpm
libxml2-debuginfo-2.7.6-4.el6_2.4.x86_64.rpm
libxml2-devel-2.7.6-4.el6_2.4.i686.rpm
libxml2-devel-2.7.6-4.el6_2.4.x86_64.rpm
libxml2-static-2.7.6-4.el6_2.4.x86_64.rpm

Red Hat Enterprise Linux HPC Node (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6ComputeNode/en/os/SRPMS/libxml2-2.7.6-4.el6_2.4.src.rpm

x86_64:
libxml2-2.7.6-4.el6_2.4.i686.rpm
libxml2-2.7.6-4.el6_2.4.x86_64.rpm
libxml2-debuginfo-2.7.6-4.el6_2.4.i686.rpm
libxml2-debuginfo-2.7.6-4.el6_2.4.x86_64.rpm
libxml2-python-2.7.6-4.el6_2.4.x86_64.rpm

Red Hat Enterprise Linux HPC Node Optional (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6ComputeNode/en/os/SRPMS/libxml2-2.7.6-4.el6_2.4.src.rpm

x86_64:
libxml2-debuginfo-2.7.6-4.el6_2.4.i686.rpm
libxml2-debuginfo-2.7.6-4.el6_2.4.x86_64.rpm
libxml2-devel-2.7.6-4.el6_2.4.i686.rpm
libxml2-devel-2.7.6-4.el6_2.4.x86_64.rpm
libxml2-static-2.7.6-4.el6_2.4.x86_64.rpm

Red Hat Enterprise Linux Server (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Server/en/os/SRPMS/libxml2-2.7.6-4.el6_2.4.src.rpm

i386:
libxml2-2.7.6-4.el6_2.4.i686.rpm
libxml2-debuginfo-2.7.6-4.el6_2.4.i686.rpm
libxml2-devel-2.7.6-4.el6_2.4.i686.rpm
libxml2-python-2.7.6-4.el6_2.4.i686.rpm

ppc64:
libxml2-2.7.6-4.el6_2.4.ppc.rpm
libxml2-2.7.6-4.el6_2.4.ppc64.rpm
libxml2-debuginfo-2.7.6-4.el6_2.4.ppc.rpm
libxml2-debuginfo-2.7.6-4.el6_2.4.ppc64.rpm
libxml2-devel-2.7.6-4.el6_2.4.ppc.rpm
libxml2-devel-2.7.6-4.el6_2.4.ppc64.rpm
libxml2-python-2.7.6-4.el6_2.4.ppc64.rpm

s390x:
libxml2-2.7.6-4.el6_2.4.s390.rpm
libxml2-2.7.6-4.el6_2.4.s390x.rpm
libxml2-debuginfo-2.7.6-4.el6_2.4.s390.rpm
libxml2-debuginfo-2.7.6-4.el6_2.4.s390x.rpm
libxml2-devel-2.7.6-4.el6_2.4.s390.rpm
libxml2-devel-2.7.6-4.el6_2.4.s390x.rpm
libxml2-python-2.7.6-4.el6_2.4.s390x.rpm

x86_64:
libxml2-2.7.6-4.el6_2.4.i686.rpm
libxml2-2.7.6-4.el6_2.4.x86_64.rpm
libxml2-debuginfo-2.7.6-4.el6_2.4.i686.rpm
libxml2-debuginfo-2.7.6-4.el6_2.4.x86_64.rpm
libxml2-devel-2.7.6-4.el6_2.4.i686.rpm
libxml2-devel-2.7.6-4.el6_2.4.x86_64.rpm
libxml2-python-2.7.6-4.el6_2.4.x86_64.rpm

Red Hat Enterprise Linux Server Optional (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Server/en/os/SRPMS/libxml2-2.7.6-4.el6_2.4.src.rpm

i386:
libxml2-debuginfo-2.7.6-4.el6_2.4.i686.rpm
libxml2-static-2.7.6-4.el6_2.4.i686.rpm

ppc64:
libxml2-debuginfo-2.7.6-4.el6_2.4.ppc64.rpm
libxml2-static-2.7.6-4.el6_2.4.ppc64.rpm

s390x:
libxml2-debuginfo-2.7.6-4.el6_2.4.s390x.rpm
libxml2-static-2.7.6-4.el6_2.4.s390x.rpm

x86_64:
libxml2-debuginfo-2.7.6-4.el6_2.4.x86_64.rpm
libxml2-static-2.7.6-4.el6_2.4.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Workstation/en/os/SRPMS/libxml2-2.7.6-4.el6_2.4.src.rpm

i386:
libxml2-2.7.6-4.el6_2.4.i686.rpm
libxml2-debuginfo-2.7.6-4.el6_2.4.i686.rpm
libxml2-devel-2.7.6-4.el6_2.4.i686.rpm
libxml2-python-2.7.6-4.el6_2.4.i686.rpm

x86_64:
libxml2-2.7.6-4.el6_2.4.i686.rpm
libxml2-2.7.6-4.el6_2.4.x86_64.rpm
libxml2-debuginfo-2.7.6-4.el6_2.4.i686.rpm
libxml2-debuginfo-2.7.6-4.el6_2.4.x86_64.rpm
libxml2-devel-2.7.6-4.el6_2.4.i686.rpm
libxml2-devel-2.7.6-4.el6_2.4.x86_64.rpm
libxml2-python-2.7.6-4.el6_2.4.x86_64.rpm

Red Hat Enterprise Linux Workstation Optional (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Workstation/en/os/SRPMS/libxml2-2.7.6-4.el6_2.4.src.rpm

i386:
libxml2-debuginfo-2.7.6-4.el6_2.4.i686.rpm
libxml2-static-2.7.6-4.el6_2.4.i686.rpm

x86_64:
libxml2-debuginfo-2.7.6-4.el6_2.4.x86_64.rpm
libxml2-static-2.7.6-4.el6_2.4.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-2012-0841.html
https://access.redhat.com/security/updates/classification/#moderate

8. Contact:

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

Copyright 2012 Red Hat, Inc.
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