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Ubuntu: Security update for libxml2

It was discovered that libxml2 had a heap-based buffer underflow when parsing entities. If a user or automated system were tricked into processing a specially crafted XML document, applications linked against libxml2 could be made to crash or possibly execute arbitrary code.

Updated packages are available from security.ubuntu.com.

==========================================================================
Ubuntu Security Notice USN-1656-1
December 06, 2012

libxml2 vulnerability
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 12.10
- Ubuntu 12.04 LTS
- Ubuntu 11.10
- Ubuntu 10.04 LTS
- Ubuntu 8.04 LTS

Summary:

Applications using libxml2 could be made to crash or run programs as
your login if they opened a specially crafted file.

Software Description:
- libxml2: GNOME XML library

Details:

It was discovered that libxml2 had a heap-based buffer underflow
when parsing entities. If a user or automated system were tricked into
processing a specially crafted XML document, applications linked against
libxml2 could be made to crash or possibly execute arbitrary code.

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 12.10:
 libxml2                         2.8.0+dfsg1-5ubuntu2.1

Ubuntu 12.04 LTS:
 libxml2                         2.7.8.dfsg-5.1ubuntu4.3

Ubuntu 11.10:
 libxml2                         2.7.8.dfsg-4ubuntu0.5

Ubuntu 10.04 LTS:
 libxml2                         2.7.6.dfsg-1ubuntu1.7

Ubuntu 8.04 LTS:
 libxml2                         2.6.31.dfsg-2ubuntu1.11

After a standard system update you need to reboot your computer to make
all the necessary changes.

References:
 http://www.ubuntu.com/usn/usn-1656-1
 CVE-2012-5134

Package Information:
 https://launchpad.net/ubuntu/+source/libxml2/2.8.0+dfsg1-5ubuntu2.1
 https://launchpad.net/ubuntu/+source/libxml2/2.7.8.dfsg-5.1ubuntu4.3
 https://launchpad.net/ubuntu/+source/libxml2/2.7.8.dfsg-4ubuntu0.5
 https://launchpad.net/ubuntu/+source/libxml2/2.7.6.dfsg-1ubuntu1.7
 https://launchpad.net/ubuntu/+source/libxml2/2.6.31.dfsg-2ubuntu1.11
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