Ubuntu: 1904-2: libxml2 regression
Posted by Benjamin D. Thomas   
Ubuntu USN-1904-1 introduced a regression in libxml2.
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Ubuntu Security Notice USN-1904-2
July 17, 2013

libxml2 regression
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 13.04
- Ubuntu 12.10
- Ubuntu 12.04 LTS
- Ubuntu 10.04 LTS

Summary:

USN-1904-1 introduced a regression in libxml2.

Software Description:
- libxml2: GNOME XML library

Details:

USN-1904-1 fixed vulnerabilities in libxml2. The update caused a regression
for certain users. This update fixes the problem.

We apologize for the inconvenience.

Original advisory details:

 It was discovered that libxml2 would load XML external entities by default.
 If a user or automated system were tricked into opening a specially crafted
 document, an attacker could possibly obtain access to arbitrary files or
 cause resource consumption. This issue only affected Ubuntu 10.04 LTS,
 Ubuntu 12.04 LTS, and Ubuntu 12.10. (CVE-2013-0339)

 It was discovered that libxml2 incorrectly handled documents that end
 abruptly. If a user or automated system were tricked into opening a
 specially crafted document, an attacker could possibly cause libxml2 to
 crash, resulting in a denial of service. (CVE-2013-2877)

Update instructions:

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

Ubuntu 13.04:
  libxml2                         2.9.0+dfsg1-4ubuntu4.3

Ubuntu 12.10:
  libxml2                         2.8.0+dfsg1-5ubuntu2.4

Ubuntu 12.04 LTS:
  libxml2                         2.7.8.dfsg-5.1ubuntu4.6

Ubuntu 10.04 LTS:
  libxml2                         2.7.6.dfsg-1ubuntu1.10

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

References:
  http://www.ubuntu.com/usn/usn-1904-2
  http://www.ubuntu.com/usn/usn-1904-1
  https://launchpad.net/bugs/1201849

Package Information:
  https://launchpad.net/ubuntu/+source/libxml2/2.9.0+dfsg1-4ubuntu4.3
  https://launchpad.net/ubuntu/+source/libxml2/2.8.0+dfsg1-5ubuntu2.4
  https://launchpad.net/ubuntu/+source/libxml2/2.7.8.dfsg-5.1ubuntu4.6
  https://launchpad.net/ubuntu/+source/libxml2/2.7.6.dfsg-1ubuntu1.10