========================================================================== Ubuntu Security Notice USN-3407-1 August 30, 2017 pyjwt vulnerability ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 17.04 - Ubuntu 16.04 LTS Summary: PyJWT could be made to crash if it received specially crafted input. Software Description: - pyjwt: Python implementation of JSON Web Token Details: It was discovered that a vulnerability in PyJWT doesn't check invalid_strings properly for some public keys. A remote attacker could take advantage of a key confusion to craft JWTs from scratch. Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 17.04: A python-jwtA A A A A A A A A A A A A A A A A A A A A A 1.4.2-1ubuntu0.1 A python3-jwtA A A A A A A A A A A A A A A A A A A A A 1.4.2-1ubuntu0.1 Ubuntu 16.04 LTS: A python-jwtA A A A A A A A A A A A A A A A A A A A A A 1.3.0-1ubuntu0.1 A python3-jwtA A A A A A A A A A A A A A A A A A A A A 1.3.0-1ubuntu0.1 In general, a standard system update will make all the necessary changes. References: A https://www.ubuntu.com/usn/usn-3407-1 A CVE-2017-11424 Package Information: A https://launchpad.net/ubuntu/+source/pyjwt/1.4.2-1ubuntu0.1 A https://launchpad.net/ubuntu/+source/pyjwt/1.3.0-1ubuntu0.1