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Ubuntu Security Notice USN-5066-2

Ubuntu Security Notice USN-5066-2
Posted Sep 9, 2021
Authored by Ubuntu | Site security.ubuntu.com

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.

tags | advisory, remote
systems | linux, ubuntu
advisories | CVE-2021-21239
SHA-256 | 41c13c35a14bbb7426ecc4b6909750bc3f4149a79f6ef82d4d0c47198d98fcbb

Ubuntu Security Notice USN-5066-2

Change Mirror Download
==========================================================================
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

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
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