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    Ubuntu 4516-1: GnuPG vulnerability

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    GnuPG could be made to expose sensitive information.
    ==========================================================================
    Ubuntu Security Notice USN-4516-1
    September 17, 2020
    
    gnupg2 vulnerability
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 18.04 LTS
    
    Summary:
    
    GnuPG could be made to expose sensitive information.
    
    Software Description:
    - gnupg2: GNU privacy guard - a free PGP replacement
    
    Details:
    
    It was discovered that GnuPG signatures could be forged when the SHA-1
    algorithm is being used. This update removes validating signatures based on
    SHA-1 that were generated after 2019-01-19. In environments where this is
    still required, a new option --allow-weak-key-signatures can be used to
    revert this behaviour.
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 18.04 LTS:
      gnupg                           2.2.4-1ubuntu1.3
    
    In general, a standard system update will make all the necessary changes.
    
    References:
      https://usn.ubuntu.com/4516-1
      CVE-2019-14855
    
    Package Information:
      https://launchpad.net/ubuntu/+source/gnupg2/2.2.4-1ubuntu1.3
    
    

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