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    Ubuntu 4365-2: Bind vulnerabilities

    Date 20 May 2020
    Posted By LinuxSecurity Advisories
    Several security issues were fixed in Bind.
    Ubuntu Security Notice USN-4365-2
    May 20, 2020
    bind9 vulnerabilities
    A security issue affects these releases of Ubuntu and its derivatives:
    - Ubuntu 14.04 ESM
    - Ubuntu 12.04 ESM
    Several security issues were fixed in Bind.
    Software Description:
    - bind9: Internet Domain Name Server
    USN-4365-1 fixed several vulnerabilities in Bind. This update provides
    the corresponding update for Ubuntu 12.04 ESM and 14.04 ESM.
    Original advisory details:
     Lior Shafir, Yehuda Afek, and Anat Bremler-Barr discovered that Bind
     incorrectly limited certain fetches. A remote attacker could possibly use
     this issue to cause Bind to consume resources, leading to a denial of
     service, or possibly use Bind to perform a reflection attack.
     Tobias Klein discovered that Bind incorrectly handled checking TSIG
     validity. A remote attacker could use this issue to cause Bind to crash,
     resulting in a denial of service, or possibly perform other attacks.
    Update instructions:
    The problem can be corrected by updating your system to the following
    package versions:
    Ubuntu 14.04 ESM:
      bind9                           1:9.9.5.dfsg-3ubuntu0.19+esm2
    Ubuntu 12.04 ESM:
      bind9                           1:9.8.1.dfsg.P1-4ubuntu0.30
    In general, a standard system update will make all the necessary changes.
      CVE-2020-8616, CVE-2020-8617

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