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Ubuntu Security Notice USN-1965-1
September 23, 2013

pyopenssl vulnerability
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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
- Ubuntu 10.04 LTS

Summary:

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

Software Description:
- pyopenssl: Python wrapper around the OpenSSL library

Details:

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 man 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:
  python-openssl                  0.13-2ubuntu3.1
  python3-openssl                 0.13-2ubuntu3.1

Ubuntu 12.10:
  python-openssl                  0.13-2ubuntu1.1
  python3-openssl                 0.13-2ubuntu1.1

Ubuntu 12.04 LTS:
  python-openssl                  0.12-1ubuntu2.1

Ubuntu 10.04 LTS:
  python-openssl                  0.10-1ubuntu0.1

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

References:
  http://www.ubuntu.com/usn/usn-1965-1
  CVE-2013-4314

Package Information:
  https://launchpad.net/ubuntu/+source/pyopenssl/0.13-2ubuntu3.1
  https://launchpad.net/ubuntu/+source/pyopenssl/0.13-2ubuntu1.1
  https://launchpad.net/ubuntu/+source/pyopenssl/0.12-1ubuntu2.1
  https://launchpad.net/ubuntu/+source/pyopenssl/0.10-1ubuntu0.1