Ubuntu 13.04: 1965-1 Moderate: pyOpenSSL Man In The Middle Threat

ubuntu

September 23, 2013

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

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.

Topics Covered

security advisory ubuntu man in the middle pyopenssl sensitive data exposure

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.