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Ubuntu Security Notice USN-1904-2

Ubuntu Security Notice USN-1904-2
Posted Jul 17, 2013
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 1904-2 - USN-1904-1 fixed vulnerabilities in libxml2. The update caused a regression for certain users. This update fixes the problem. 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. Various other issues were also addressed.

tags | advisory, arbitrary, vulnerability, xxe
systems | linux, ubuntu
advisories | CVE-2013-0339, CVE-2013-2877
SHA-256 | 73ee61050460c5c1a204774c868ab1fa47667ad17da81dbf917de23f5248cb36

Ubuntu Security Notice USN-1904-2

Change Mirror Download
============================================================================
Ubuntu Security Notice USN-1904-2
July 17, 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 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
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