[USN-5066-2] PySAML2 vulnerability

========================================================================== Ubuntu Security Notice USN-5066-2 September 08, 2021
python-pysaml2 vulnerability ==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
– Ubuntu 16.04 ESM
PySAML2 could be made to accept invalid SAML documents.
Software Description: – python-pysaml2: Pure python implementation of SAML2
USN-5066-1 fixed a vulnerability in PySAML2. This update provides the corresponding update for Ubuntu 16.04 ESM.
Original advisory details:
Brian Wolff discovered that PySAML2 incorrectly validated cryptographic signatures. A remote attacker could possibly use this issue to alter SAML documents.
Update instructions:
The problem can be corrected by updating your system to the following package versions:
Ubuntu 16.04 ESM: python-pysaml2 3.0.0-3ubuntu1.16.04.4+esm1 python3-pysaml2 3.0.0-3ubuntu1.16.04.4+esm1
In general, a standard system update will make all the necessary changes.
References: ubuntu.com/security/notices/USN-5066-2 ubuntu.com/security/notices/USN-5066-1 CVE-2021-21239