USN-3134-1: Python vulnerabilities

Releases

• Ubuntu 16.04 ESM
• Ubuntu 14.04 ESM
• Ubuntu 12.04

Packages

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

Details

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

• 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

• 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

• 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

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

References

• CVE-2016-0772
• CVE-2016-1000110
• CVE-2016-5636
• CVE-2016-5699