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Ubuntu 21.04: 5066-1 Moderate: PySAML2 Signature Validation Issue

ubuntu
Calendar Grey September 8, 2021
Dist Ubuntu Esm H88
A vulnerability in python-pysaml2 permits erroneous SAML documents, impacting Ubuntu versions 21.04, 20.04 LTS, and 18.04 LTS.
PySAML2 could be made to accept invalid SAML documents.

Summary

PySAML2 could be made to accept invalid SAML documents.

Software Description:

- 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.

Topics%20covered

Topics Covered

security advisory remote attack Ubuntu signature validation python-pysaml2

Update Instructions

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 21.04:
  python3-pysaml2                 6.1.0-0ubuntu1.21.04.1

Ubuntu 20.04 LTS:
  python3-pysaml2                 4.9.0-0ubuntu3.1

Ubuntu 18.04 LTS:
  python-pysaml2                  4.0.2-0ubuntu3.2
  python3-pysaml2                 4.0.2-0ubuntu3.2

In general, a standard system update will make all the necessary changes.

References

https://ubuntu.com/security/notices/USN-5066-1

CVE-2021-21239

Severity
important
Lowest
Low
Medium
High
Critical

September 08, 2021

Topics%20covered

Topics Covered

security advisory remote attack Ubuntu signature validation python-pysaml2

Package Information

https://launchpad.net/ubuntu/+source/python-pysaml2/6.1.0-0ubuntu1.21.04.1
https://launchpad.net/ubuntu/+source/python-pysaml2/4.9.0-0ubuntu3.1
https://launchpad.net/ubuntu/+source/python-pysaml2/4.0.2-0ubuntu3.2

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