USN-1985-1: Python 3.3 vulnerabilities

Ubuntu Security Notice USN-1985-1

1st October, 2013

python3.3 vulnerabilities

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

  • Ubuntu 13.04
  • Ubuntu 12.10


Several security issues were fixed in Python.

Software description

  • python3.3 - An interactive high-level object-oriented language


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.

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 version:

Ubuntu 13.04:
python3.3-minimal 3.3.1-1ubuntu5.2
python3.3 3.3.1-1ubuntu5.2
Ubuntu 12.10:
python3.3-minimal 3.3.0-1ubuntu0.1
python3.3 3.3.0-1ubuntu0.1

To update your system, please follow these instructions:

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


CVE-2013-2099, CVE-2013-4238