Linux Security
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    Ubuntu 4374-1: Unbound vulnerabilities

    Date 27 May 2020
    Posted By LinuxSecurity Advisories
    Several security issues were fixed in Unbound.
    Ubuntu Security Notice USN-4374-1
    May 27, 2020
    unbound vulnerabilities
    A security issue affects these releases of Ubuntu and its derivatives:
    - Ubuntu 20.04 LTS
    - Ubuntu 19.10
    - Ubuntu 18.04 LTS
    Several security issues were fixed in Unbound.
    Software Description:
    - unbound: validating, recursive, caching DNS resolver
    Lior Shafir, Yehuda Afek, and Anat Bremler-Barr discovered that Unbound
    incorrectly handled certain queries. A remote attacker could use this issue
    to perform an amplification attack directed at a target. (CVE-2020-12662)
    It was discovered that Unbound incorrectly handled certain malformed
    answers. A remote attacker could possibly use this issue to cause Unbound
    to crash, resulting in a denial of service. (CVE-2020-12663)
    Update instructions:
    The problem can be corrected by updating your system to the following
    package versions:
    Ubuntu 20.04 LTS:
      libunbound8                     1.9.4-2ubuntu1.1
      unbound                         1.9.4-2ubuntu1.1
    Ubuntu 19.10:
      libunbound8                     1.9.0-2ubuntu1.1
      unbound                         1.9.0-2ubuntu1.1
    Ubuntu 18.04 LTS:
      libunbound2                     1.6.7-1ubuntu2.3
      unbound                         1.6.7-1ubuntu2.3
    In general, a standard system update will make all the necessary changes.
      CVE-2020-12662, CVE-2020-12663
    Package Information:

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