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    Ubuntu 4397-1: NSS vulnerabilities

    Date
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    Several security issues were fixed in NSS.
    ==========================================================================
    Ubuntu Security Notice USN-4397-1
    June 16, 2020
    
    nss vulnerabilities
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 20.04 LTS
    - Ubuntu 19.10
    - Ubuntu 18.04 LTS
    - Ubuntu 16.04 LTS
    
    Summary:
    
    Several security issues were fixed in NSS.
    
    Software Description:
    - nss: Network Security Service library
    
    Details:
    
    It was discovered that NSS incorrectly handled the TLS State Machine. A
    remote attacker could possibly use this issue to cause NSS to hang,
    resulting in a denial of service. This issue only affected Ubuntu 18.04 LTS
    and Ubuntu 19.10. (CVE-2019-17023)
    
    Cesar Pereida Garcia discovered that NSS incorrectly handled DSA key
    generation. A local attacker could possibly use this issue to perform a
    timing attack and recover DSA keys. (CVE-2020-12399)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 20.04 LTS:
      libnss3                         2:3.49.1-1ubuntu1.1
    
    Ubuntu 19.10:
      libnss3                         2:3.45-1ubuntu2.3
    
    Ubuntu 18.04 LTS:
      libnss3                         2:3.35-2ubuntu2.8
    
    Ubuntu 16.04 LTS:
      libnss3                         2:3.28.4-0ubuntu0.16.04.11
    
    After a standard system update you need to reboot your computer to make
    all the necessary changes.
    
    References:
      https://usn.ubuntu.com/4397-1
      CVE-2019-17023, CVE-2020-12399
    
    Package Information:
      https://launchpad.net/ubuntu/+source/nss/2:3.49.1-1ubuntu1.1
      https://launchpad.net/ubuntu/+source/nss/2:3.45-1ubuntu2.3
      https://launchpad.net/ubuntu/+source/nss/2:3.35-2ubuntu2.8
      https://launchpad.net/ubuntu/+source/nss/2:3.28.4-0ubuntu0.16.04.11
    
    

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