=========================================================================== Ubuntu Security Notice USN-3138-1 November 28, 2016 python-cryptography vulnerability =========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 16.10 - Ubuntu 16.04 LTS Summary: python-cryptography could generate incorrect keys. Software Description: - python-cryptography: Cryptography Python library Details: Markus D=C3=B6ring discovered that python-cryptography incorrectly handled certain HKDF lengths. This could result in python-cryptography returning an empty string instead of the expected derived key. Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 16.10: python-cryptography 1.5-2ubuntu0.1 python3-cryptography 1.5-2ubuntu0.1 Ubuntu 16.04 LTS: python-cryptography 1.2.3-1ubuntu0.1 python3-cryptography 1.2.3-1ubuntu0.1 In general, a standard system update will make all the necessary changes. References: http://www.ubuntu.com/usn/usn-3138-1 CVE-2016-9243 Package Information: https://launchpad.net/ubuntu/+source/python-cryptography/1.5-2ubuntu0.1 https://launchpad.net/ubuntu/+source/python-cryptography/1.2.3-1ubuntu0.1