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AUSCERT External Security Bulletin Redistribution
ESB-2021.3029
USN-5066-1: PySAML2 vulnerability
9 September 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: PySAML2
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Reduced Security -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2021-21239
Reference: ESB-2021.0722
ESB-2021.0320
Original Bulletin:
https://ubuntu.com/security/notices/USN-5066-1
https://ubuntu.com/security/notices/USN-5066-2
Comment: This bulletin contains two (2) Ubuntu security advisories.
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USN-5066-1: PySAML2 vulnerability
08 September 2021
PySAML2 could be made to accept invalid SAML documents.
Releases
o Ubuntu 21.04
o Ubuntu 20.04 LTS
o Ubuntu 18.04 LTS
Packages
o python-pysaml2 - Pure python implementation of SAML2
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 21.04
o python3-pysaml2 - 6.1.0-0ubuntu1.21.04.1
Ubuntu 20.04
o python3-pysaml2 - 4.9.0-0ubuntu3.1
Ubuntu 18.04
o python-pysaml2 - 4.0.2-0ubuntu3.2
o python3-pysaml2 - 4.0.2-0ubuntu3.2
In general, a standard system update will make all the necessary changes.
References
o CVE-2021-21239
Related notices
o USN-5066-2 : python-pysaml2, python3-pysaml2, python-pysaml2-doc
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USN-5066-2: PySAML2 vulnerability
08 September 2021
PySAML2 could be made to accept invalid SAML documents.
Releases
o Ubuntu 16.04 ESM
Packages
o 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
o python-pysaml2 - 3.0.0-3ubuntu1.16.04.4+esm1
Available with UA Infra or UA Desktop
o python3-pysaml2 - 3.0.0-3ubuntu1.16.04.4+esm1
Available with UA Infra or UA Desktop
In general, a standard system update will make all the necessary changes.
References
o CVE-2021-21239
Related notices
o USN-5066-1 : python-pysaml2, python3-pysaml2, python-pysaml2-doc
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