Ubuntu 13.04 USN-1904-2 Critical: libxml2 Denial Of Service Issue

ubuntu

July 17, 2013

USN-1904-1 introduced a regression in libxml2.

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)

Topics Covered

security advisory denial of service Ubuntu update instructions libxml2 regression

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.