Ubuntu 4196-1: python-ecdsa vulnerabilities

    Date18 Nov 2019
    CategoryUbuntu
    102
    Posted ByLinuxSecurity Advisories
    Several security issues were fixed in python-ecdsa.
    ==========================================================================
    Ubuntu Security Notice USN-4196-1
    November 18, 2019
    
    python-ecdsa vulnerabilities
    ==========================================================================
    
    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:
    
    Several security issues were fixed in python-ecdsa.
    
    Software Description:
    - python-ecdsa: ECDSA cryptographic signature library
    
    Details:
    
    It was discovered that python-ecdsa incorrectly handled certain signatures.
    A remote attacker could possibly use this issue to cause python-ecdsa to
    generate unexpected exceptions, resulting in a denial of service.
    (CVE-2019-14853)
    
    It was discovered that python-ecdsa incorrectly verified DER encoding in
    signatures. A remote attacker could use this issue to perform certain
    malleability attacks. (CVE-2019-14859)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 19.10:
      python-ecdsa                    0.13.2-2ubuntu0.1
      python3-ecdsa                   0.13.2-2ubuntu0.1
    
    Ubuntu 19.04:
      python-ecdsa                    0.13-3ubuntu0.1
      python3-ecdsa                   0.13-3ubuntu0.1
    
    Ubuntu 18.04 LTS:
      python-ecdsa                    0.13-2ubuntu0.18.04.1
      python3-ecdsa                   0.13-2ubuntu0.18.04.1
    
    Ubuntu 16.04 LTS:
      python-ecdsa                    0.13-2ubuntu0.16.04.1
      python3-ecdsa                   0.13-2ubuntu0.16.04.1
    
    In general, a standard system update will make all the necessary changes.
    
    References:
      https://usn.ubuntu.com/4196-1
      CVE-2019-14853, CVE-2019-14859
    
    Package Information:
      https://launchpad.net/ubuntu/+source/python-ecdsa/0.13.2-2ubuntu0.1
      https://launchpad.net/ubuntu/+source/python-ecdsa/0.13-3ubuntu0.1
      https://launchpad.net/ubuntu/+source/python-ecdsa/0.13-2ubuntu0.18.04.1
      https://launchpad.net/ubuntu/+source/python-ecdsa/0.13-2ubuntu0.16.04.1
    
    
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