python-pysaml2 vulnerability

A security issue affects these releases of Ubuntu and its
derivatives:

* Ubuntu 19.10
* Ubuntu 19.04
* Ubuntu 18.04 LTS
* Ubuntu 16.04 LTS

Summary

PySAML2 could be made to bypass signature verification with
arbitrary data.

Software Description

* python-pysaml2 - Pure python implementation of SAML2

Details

It was discovered that PySAML2 incorrectly handled certain SAML
files. An attacker could possibly use this issue to bypass
signature verification with arbitrary data.

Update instructions

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

Ubuntu 19.10
python-pysaml2 - 4.5.0+dfsg1-0ubuntu2.19.10.1
python3-pysaml2 - 4.5.0+dfsg1-0ubuntu2.19.10.1

Ubuntu 19.04
python-pysaml2 - 4.5.0+dfsg1-0ubuntu2.19.04.1
python3-pysaml2 - 4.5.0+dfsg1-0ubuntu2.19.04.1

Ubuntu 18.04 LTS
python-pysaml2 - 4.0.2-0ubuntu3.1
python3-pysaml2 - 4.0.2-0ubuntu3.1

Ubuntu 16.04 LTS
python-pysaml2 - 3.0.0-3ubuntu1.16.04.4
python3-pysaml2 - 3.0.0-3ubuntu1.16.04.4

To update your system, please follow these instructions:
https://wiki.ubuntu.com/Security/Upgrades.

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

References

* CVE-2020-5390

--- Mystic BBS v1.12 A43 (Linux/64)
* Origin: BZ&BZ BBS (21:4/110)