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Ubuntu Security Notice USN-1983-1
October 01, 2013

python2.7 vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 13.04
- Ubuntu 12.10
- Ubuntu 12.04 LTS

Summary:

Several security issues were fixed in Python.

Software Description:
- python2.7: An interactive high-level object-oriented language

Details:

Florian Weimer discovered that Python incorrectly handled matching multiple
wildcards in ssl certificate hostnames. An attacker could exploit this to
cause Python to consume resources, resulting in a denial of service. This
issue only affected Ubuntu 13.04. (CVE-2013-2099)

Ryan Sleevi discovered that Python did not properly handle certificates
with NULL characters in the Subject Alternative Name field. An attacker
could exploit this to perform a man in the middle attack to view sensitive
information or alter encrypted communications. (CVE-2013-4238)

Update instructions:

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

Ubuntu 13.04:
  python2.7                       2.7.4-2ubuntu3.2
  python2.7-minimal               2.7.4-2ubuntu3.2

Ubuntu 12.10:
  python2.7                       2.7.3-5ubuntu4.3
  python2.7-minimal               2.7.3-5ubuntu4.3

Ubuntu 12.04 LTS:
  python2.7                       2.7.3-0ubuntu3.4
  python2.7-minimal               2.7.3-0ubuntu3.4

In general, a standard system update will make all the necessary changes.

References:
  http://www.ubuntu.com/usn/usn-1983-1
  CVE-2013-2099, CVE-2013-4238

Package Information:
  https://launchpad.net/ubuntu/+source/python2.7/2.7.4-2ubuntu3.2
  https://launchpad.net/ubuntu/+source/python2.7/2.7.3-5ubuntu4.3
  https://launchpad.net/ubuntu/+source/python2.7/2.7.3-0ubuntu3.4