Ubuntu 3276-2: shadow regression

    Date16 May 2017
    Posted ByLinuxSecurity Advisories
    USN-3276-1 introduced a regression in su.
    Ubuntu Security Notice USN-3276-2
    May 17, 2017
    shadow regression
    A security issue affects these releases of Ubuntu and its derivatives:
    - Ubuntu 17.04
    - Ubuntu 16.10
    - Ubuntu 16.04 LTS
    - Ubuntu 14.04 LTS
    USN-3276-1 introduced a regression in su.
    Software Description:
    - shadow: system login tools
    USN-3276-1 intended to fix a vulnerability in su. The solution introduced
    a regression in su signal handling. This update modifies the security fix.
    We apologize for the inconvenience.
    Original advisory details:
     Sebastian Krahmer discovered integer overflows in shadow utilities.
     A local attacker could possibly cause them to crash or potentially
     gain privileges via crafted input. (CVE-2016-6252)
     Tobias Stöckmann discovered a race condition in su. A local
     attacker could cause su to send SIGKILL to other processes with
     root privileges. (CVE-2017-2616)
    Update instructions:
    The problem can be corrected by updating your system to the following
    package versions:
    Ubuntu 17.04:
      login                           1:4.2-3.2ubuntu1.17.04.2
      passwd                          1:4.2-3.2ubuntu1.17.04.2
      uidmap                          1:4.2-3.2ubuntu1.17.04.2
    Ubuntu 16.10:
      login                           1:4.2-3.2ubuntu1.16.10.2
      passwd                          1:4.2-3.2ubuntu1.16.10.2
      uidmap                          1:4.2-3.2ubuntu1.16.10.2
    Ubuntu 16.04 LTS:
      login                           1:4.2-3.1ubuntu5.3
      passwd                          1:4.2-3.1ubuntu5.3
      uidmap                          1:4.2-3.1ubuntu5.3
    Ubuntu 14.04 LTS:
      login                           1:
      passwd                          1:
      uidmap                          1:
    In general, a standard system update will make all the necessary changes.
    Package Information:
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