ESB-2018.0093 - [Win][UNIX/Linux][Ubuntu] python-pysaml2: Unauthorised access - Remote/unauthenticated 2018-01-09

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.0093
                     USN-3520-1: PySAML2 vulnerability
                              9 January 2018

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           python-pysaml2
Publisher:         Ubuntu
Operating System:  Ubuntu
                   UNIX variants (UNIX, Linux, OSX)
                   Windows
Impact/Access:     Unauthorised Access -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2017-1000433  

Original Bulletin: 
   http://www.ubuntu.com/usn/usn-3517-1

Comment: This advisory references vulnerabilities in products which run on 
         platforms other than Ubuntu. It is recommended that administrators 
         running python-pysaml2 check for an updated version of the software
         for their operating system.

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USN-3520-1: PySAML2 vulnerability
Ubuntu Security Notice USN-3520-1

8th January, 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 version:

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 

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-2017-1000433

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