USN-3134-1: Python vulnerabilities

Ubuntu Security Notice USN-3134-1

22nd 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

Summary

Several security issues were fixed in Python.

Software description

  • 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 version:

Ubuntu 16.04 LTS:
libpython2.7-minimal

2.7.12-1ubuntu0~16.04.1
libpython3.5-stdlib

3.5.2-2ubuntu0~16.04.1
libpython2.7

2.7.12-1ubuntu0~16.04.1
libpython3.5-minimal

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
libpython3.5

3.5.2-2ubuntu0~16.04.1
libpython2.7-stdlib

2.7.12-1ubuntu0~16.04.1
Ubuntu 14.04 LTS:
libpython2.7-minimal

2.7.6-8ubuntu0.3
libpython2.7

2.7.6-8ubuntu0.3
python2.7

2.7.6-8ubuntu0.3
python3.4-minimal

3.4.3-1ubuntu1~14.04.5
python2.7-minimal

2.7.6-8ubuntu0.3
python3.4

3.4.3-1ubuntu1~14.04.5
libpython3.4-minimal

3.4.3-1ubuntu1~14.04.5
libpython3.4

3.4.3-1ubuntu1~14.04.5
libpython2.7-stdlib

2.7.6-8ubuntu0.3
libpython3.4-stdlib

3.4.3-1ubuntu1~14.04.5
Ubuntu 12.04 LTS:
libpython2.7

2.7.3-0ubuntu3.9
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
libpython3.2

3.2.3-0ubuntu3.8

To update your system, please follow these instructions:
https://wiki.ubuntu.com/Security/Upgrades.

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

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