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Ubuntu Security Notice USN-2812-1

Ubuntu Security Notice USN-2812-1
Posted Nov 17, 2015
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 2812-1 - Florian Weimer discovered that libxml2 incorrectly handled certain XML data. If a user or automated system were tricked into opening a specially crafted document, an attacker could possibly cause resource consumption, resulting in a denial of service. This issue only affected Ubuntu 12.04 LTS, Ubuntu 14.04 LTS and Ubuntu 15.04. Michal Zalewski discovered that libxml2 incorrectly handled certain XML data. 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. This issue only affected Ubuntu 12.04 LTS, Ubuntu 14.04 LTS and Ubuntu 15.04. Various other issues were also addressed.

tags | advisory, denial of service
systems | linux, ubuntu
advisories | CVE-2015-1819, CVE-2015-7941, CVE-2015-7942, CVE-2015-8035
SHA-256 | 0b86195a4b80085fc469924f41acb3926e9c8feb49034bd78a19922cf368ba60

Ubuntu Security Notice USN-2812-1

Change Mirror Download
============================================================================
Ubuntu Security Notice USN-2812-1
November 16, 2015

libxml2 vulnerabilities
============================================================================

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

- Ubuntu 15.10
- Ubuntu 15.04
- Ubuntu 14.04 LTS
- Ubuntu 12.04 LTS

Summary:

Several security issues were fixed in libxml2.

Software Description:
- libxml2: GNOME XML library

Details:

Florian Weimer discovered that libxml2 incorrectly handled certain XML
data. If a user or automated system were tricked into opening a specially
crafted document, an attacker could possibly cause resource consumption,
resulting in a denial of service. This issue only affected
Ubuntu 12.04 LTS, Ubuntu 14.04 LTS and Ubuntu 15.04. (CVE-2015-1819)

Michal Zalewski discovered that libxml2 incorrectly handled certain XML
data. 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. This issue only affected
Ubuntu 12.04 LTS, Ubuntu 14.04 LTS and Ubuntu 15.04. (CVE-2015-7941)

Kostya Serebryany discovered that libxml2 incorrectly handled certain XML
data. 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, or possibly execute arbitrary code.
(CVE-2015-7942)

Gustavo Grieco discovered that libxml2 incorrectly handled certain XML
data. 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. This issue only affected
Ubuntu 14.04 LTS. (CVE-2015-8035)

Update instructions:

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

Ubuntu 15.10:
libxml2 2.9.2+zdfsg1-4ubuntu0.1

Ubuntu 15.04:
libxml2 2.9.2+dfsg1-3ubuntu0.1

Ubuntu 14.04 LTS:
libxml2 2.9.1+dfsg1-3ubuntu4.5

Ubuntu 12.04 LTS:
libxml2 2.7.8.dfsg-5.1ubuntu4.12

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

References:
http://www.ubuntu.com/usn/usn-2812-1
CVE-2015-1819, CVE-2015-7941, CVE-2015-7942, CVE-2015-8035

Package Information:
https://launchpad.net/ubuntu/+source/libxml2/2.9.2+zdfsg1-4ubuntu0.1
https://launchpad.net/ubuntu/+source/libxml2/2.9.2+dfsg1-3ubuntu0.1
https://launchpad.net/ubuntu/+source/libxml2/2.9.1+dfsg1-3ubuntu4.5
https://launchpad.net/ubuntu/+source/libxml2/2.7.8.dfsg-5.1ubuntu4.12
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