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Red Hat Enterprise Linux: RHSA-2012:0324-01 Moderate DoS Issue with libxml2

red hat
Calendar Grey February 21, 2012
Scroller Redhat
Recent libxml2 updates address a security vulnerability affecting Red Hat Enterprise Linux, classified as moderate risk. Users are encouraged to apply the upgrade.
Updated libxml2 packages that fix one security issue are now available for Red Hat Enterprise Linux 5 and 6

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

Summary

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.

Topics%20covered

Topics Covered

security advisory DoS issue Red Hat Enterprise Linux moderate severity security impact libxml2 hash collisions

References

https://access.redhat.com/security/cve/CVE-2012-0841 https://access.redhat.com/security/updates/classification#moderate

Package List

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


Read the Full Advisory


Advisory ID: RHSA-2012:0324-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2012:0324.html
Issue date: 2012-02-21

Topic

Updated libxml2 packages that fix one security issue are now available forRed Hat Enterprise Linux 5 and 6.The Red Hat Security Response Team has rated this update as having moderatesecurity impact. A Common Vulnerability Scoring System (CVSS) base score,which gives a detailed severity rating, is available from the CVE link inthe References section.

Topics%20covered

Topics Covered

security advisory DoS issue Red Hat Enterprise Linux moderate severity security impact libxml2 hash collisions

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

Bugs Fixed

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

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