USN-3134-1: Python vulnerabilities

22 November 2016

python2.7, python3.2, python3.4, python3.5 vulnerabilities

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

  • Ubuntu 16.04 LTS
  • Ubuntu 14.04 LTS
  • Ubuntu 12.04 LTS


Several security issues were fixed in Python.

Software Description

  • python2.7 - An interactive high-level object-oriented language
  • python3.5 - An interactive high-level object-oriented language
  • python3.4 - An interactive high-level object-oriented language
  • python3.2 - An interactive high-level object-oriented language


It was discovered that the smtplib library in Python did not return an error when StartTLS fails. A remote attacker could possibly use this to expose sensitive information. (CVE-2016-0772)

Rémi Rampin discovered that Python would not protect CGI applications from contents of the HTTP_PROXY environment variable when based on the contents of the Proxy header from HTTP requests. A remote attacker could possibly use this to cause a CGI application to redirect outgoing HTTP requests. (CVE-2016-1000110)

Insu Yun discovered an integer overflow in the zipimporter module in Python that could lead to a heap-based overflow. An attacker could use this to craft a special zip file that when read by Python could possibly execute arbitrary code. (CVE-2016-5636)

Guido Vranken discovered that the urllib modules in Python did not properly handle carriage return line feed (CRLF) in headers. A remote attacker could use this to craft URLs that inject arbitrary HTTP headers. This issue only affected Ubuntu 12.04 LTS and Ubuntu 14.04 LTS. (CVE-2016-5699)

Update instructions

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

Ubuntu 16.04 LTS
libpython2.7 - 2.7.12-1ubuntu0~16.04.1
libpython2.7-minimal - 2.7.12-1ubuntu0~16.04.1
libpython2.7-stdlib - 2.7.12-1ubuntu0~16.04.1
libpython3.5 - 3.5.2-2ubuntu0~16.04.1
libpython3.5-minimal - 3.5.2-2ubuntu0~16.04.1
libpython3.5-stdlib - 3.5.2-2ubuntu0~16.04.1
python2.7 - 2.7.12-1ubuntu0~16.04.1
python2.7-minimal - 2.7.12-1ubuntu0~16.04.1
python3.5 - 3.5.2-2ubuntu0~16.04.1
python3.5-minimal - 3.5.2-2ubuntu0~16.04.1
Ubuntu 14.04 LTS
libpython2.7 - 2.7.6-8ubuntu0.3
libpython2.7-minimal - 2.7.6-8ubuntu0.3
libpython2.7-stdlib - 2.7.6-8ubuntu0.3
libpython3.4 - 3.4.3-1ubuntu1~14.04.5
libpython3.4-minimal - 3.4.3-1ubuntu1~14.04.5
libpython3.4-stdlib - 3.4.3-1ubuntu1~14.04.5
python2.7 - 2.7.6-8ubuntu0.3
python2.7-minimal - 2.7.6-8ubuntu0.3
python3.4 - 3.4.3-1ubuntu1~14.04.5
python3.4-minimal - 3.4.3-1ubuntu1~14.04.5
Ubuntu 12.04 LTS
libpython2.7 - 2.7.3-0ubuntu3.9
libpython3.2 - 3.2.3-0ubuntu3.8
python2.7 - 2.7.3-0ubuntu3.9
python2.7-minimal - 2.7.3-0ubuntu3.9
python3.2 - 3.2.3-0ubuntu3.8
python3.2-minimal - 3.2.3-0ubuntu3.8

To update your system, please follow these instructions:

After a standard system update you need to restart any Python applications to make all the necessary changes.