USN-1983-1: Python 2.7 vulnerabilities

Releases

• Ubuntu 13.04
• Ubuntu 12.10
• Ubuntu 12.04

Packages

• 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 machine-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

• 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

• CVE-2013-2099
• CVE-2013-4238

Related notices

• USN-1985-1
• USN-1984-1
• USN-1982-1