USN-1904-2: libxml2 regression

Ubuntu Security Notice USN-1904-2

17th July, 2013

libxml2 regression

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 version:

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

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

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

References

LP: 1201849