[USN-3520-1] PySAML2 vulnerability

[Leonidas S. Barbosa]

==========================================================================
Ubuntu Security Notice USN-3520-1
January 08, 2018

python-pysaml2 vulnerability
==========================================================================

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

- Ubuntu 17.10
- Ubuntu 17.04
- Ubuntu 16.04 LTS

Summary:

PySAML2 could allow authentication without a password.

Software Description:
- python-pysaml2: Pure python implementation of SAML2

Details:

It was discovered that PySAML2 incorrectly accepted any password when
run with python optimizations enabled. An attacker could use this issue
to authenticate as any user without a valid password.

Update instructions:

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

Ubuntu 17.10:
  python-pysaml2                  3.0.0-3ubuntu2.2
  python3-pysaml2                 3.0.0-3ubuntu2.2

Ubuntu 17.04:
  python-pysaml2                  3.0.0-3ubuntu1.17.04.3
  python3-pysaml2                 3.0.0-3ubuntu1.17.04.3

Ubuntu 16.04 LTS:
  python-pysaml2                  3.0.0-3ubuntu1.16.04.3
  python3-pysaml2                 3.0.0-3ubuntu1.16.04.3

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

References:
  https://www.ubuntu.com/usn/usn-3520-1
  CVE-2017-1000433

Package Information:
  https://launchpad.net/ubuntu/+source/python-pysaml2/3.0.0-3ubuntu2.2
  https://launchpad.net/ubuntu/+source/python-pysaml2/3.0.0-3ubuntu1.17.04.3
  https://launchpad.net/ubuntu/+source/python-pysaml2/3.0.0-3ubuntu1.16.04.3
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