Linux Security
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    Ubuntu 4245-1: PySAML2 vulnerability

    Date 21 Jan 2020
    421
    Posted By LinuxSecurity Advisories
    PySAML2 could be made to bypass signature verification with arbitrary data.
    ==========================================================================
    Ubuntu Security Notice USN-4245-1
    January 21, 2020
    
    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
    
    In general, a standard system update will make all the necessary changes.
    
    References:
      https://usn.ubuntu.com/4245-1
      CVE-2020-5390
    
    Package Information:
      https://launchpad.net/ubuntu/+source/python-pysaml2/4.5.0+dfsg1-0ubuntu2.19.10.1
      https://launchpad.net/ubuntu/+source/python-pysaml2/4.5.0+dfsg1-0ubuntu2.19.04.1
      https://launchpad.net/ubuntu/+source/python-pysaml2/4.0.2-0ubuntu3.1
      https://launchpad.net/ubuntu/+source/python-pysaml2/3.0.0-3ubuntu1.16.04.4
    

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