Ubuntu Security Notice USN-2994-1
6th June, 2016
libxml2 vulnerabilities
A security issue affects these releases of Ubuntu and its
derivatives:
- Ubuntu 16.04 LTS
- Ubuntu 15.10
- Ubuntu 14.04 LTS
- Ubuntu 12.04 LTS
Summary
Several security issues were fixed in libxml2.
Software description
- libxml2
- GNOME XML library
Details
It was discovered that libxml2 incorrectly handled certain malformed
documents. 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-2015-8806, CVE-2016-2073,
CVE-2016-3627, CVE-2016-3705, CVE-2016-4447)
It was discovered that libxml2 incorrectly handled certain malformed
documents. If a user or automated system were tricked into opening a
specially crafted document, an attacker could cause libxml2 to crash,
resulting in a denial of service, or possibly execute arbitrary code.
(CVE-2016-1762, CVE-2016-1834)
Mateusz Jurczyk discovered that libxml2 incorrectly handled certain
malformed documents. If a user or automated system were tricked into
opening a specially crafted document, an attacker could cause libxml2 to
crash, resulting in a denial of service, or possibly execute arbitrary
code. (CVE-2016-1833, CVE-2016-1838, CVE-2016-1839)
Wei Lei and Liu Yang discovered that libxml2 incorrectly handled certain
malformed documents. If a user or automated system were tricked into
opening a specially crafted document, an attacker could cause libxml2 to
crash, resulting in a denial of service, or possibly execute arbitrary
code. (CVE-2016-1835, CVE-2016-1837)
Wei Lei and Liu Yang discovered that libxml2 incorrectly handled certain
malformed documents. If a user or automated system were tricked into
opening a specially crafted document, an attacker could cause libxml2 to
crash, resulting in a denial of service, or possibly execute arbitrary
code. This issue only applied to Ubuntu 14.04 LTS, Ubuntu 15.10 and
Ubuntu 16.04 LTS. (CVE-2016-1836)
Kostya Serebryany discovered that libxml2 incorrectly handled certain
malformed documents. If a user or automated system were tricked into
opening a specially crafted document, an attacker could cause libxml2 to
crash, resulting in a denial of service, or possibly execute arbitrary
code. (CVE-2016-1840)
It was discovered that libxml2 would load certain XML external entities. 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. (CVE-2016-4449)
Gustavo Grieco discovered that libxml2 incorrectly handled certain
malformed documents. 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-2016-4483)
Update instructions
The problem can be corrected by updating your system to the following
package version:
- Ubuntu 16.04 LTS:
libxml2
2.9.3+dfsg1-1ubuntu0.1
- Ubuntu 15.10:
libxml2
2.9.2+zdfsg1-4ubuntu0.4
- Ubuntu 14.04 LTS:
libxml2
2.9.1+dfsg1-3ubuntu4.8
- Ubuntu 12.04 LTS:
libxml2
2.7.8.dfsg-5.1ubuntu4.15
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
CVE-2015-8806,
CVE-2016-1762,
CVE-2016-1833,
CVE-2016-1834,
CVE-2016-1835,
CVE-2016-1836,
CVE-2016-1837,
CVE-2016-1838,
CVE-2016-1839,
CVE-2016-1840,
CVE-2016-2073,
CVE-2016-3627,
CVE-2016-3705,
CVE-2016-4447,
CVE-2016-4449,
CVE-2016-4483