Ubuntu 3434-2: Libidn vulnerability

    Date23 Oct 2017
    Posted ByLinuxSecurity Advisories
    Libidn could be made to crash or run programs if it processed specially crafted input.
    Ubuntu Security Notice USN-3434-2
    October 23, 2017
    libidn vulnerability
    A security issue affects these releases of Ubuntu and its derivatives:
    - Ubuntu 12.04 ESM
    Libidn could be made to crash or run programs if it processed specially
    crafted input.
    Software Description:
    - libidn: implementation of IETF IDN specifications
    USN-3434-1 fixed a vulnerability in  Libidn. This update
    provides the corresponding update for Ubuntu 12.04 ESM.
    Original advisory details:
     It was discovered that Libidn incorrectly handled decoding certain
     digits. A remote attacker could use this issue to cause Libidn to
     crash, resulting in a denial of service, or possibly execute arbitrary
    Update instructions:
    The problem can be corrected by updating your system to the following
    package versions:
    Ubuntu 12.04 ESM:
      libidn11                        1.23-2ubuntu0.2
    In general, a standard system update will make all the necessary
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