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USN-1965-1: pyOpenSSL vulnerability

23 September 2013

Fraudulent security certificates could allow sensitive information to be exposed when accessing the Internet.



  • pyopenssl - Python wrapper around the OpenSSL library


It was discovered that pyOpenSSL 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.

Update instructions

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

Ubuntu 13.04
Ubuntu 12.10
Ubuntu 12.04
Ubuntu 10.04

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