Ubuntu Security Notice 5066-2 - USN-5066-1 fixed a vulnerability in PySAML2. This update provides the corresponding update for Ubuntu 16.04 ESM. Brian Wolff discovered that PySAML2 incorrectly validated cryptographic signatures. A remote attacker could possibly use this issue to alter SAML documents. Various other issues were also addressed.
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Ubuntu Security Notice USN-5066-2
September 08, 2021
python-pysaml2 vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 16.04 ESM
Summary:
PySAML2 could be made to accept invalid SAML documents.
Software Description:
- python-pysaml2: Pure python implementation of SAML2
Details:
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:
https://ubuntu.com/security/notices/USN-5066-2
https://ubuntu.com/security/notices/USN-5066-1
CVE-2021-21239