Ubuntu 3276-2: shadow regression

    Date16 May 2017
    CategoryUbuntu
    56
    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
    
    Summary:
    
    USN-3276-1 introduced a regression in su.
    
    Software Description:
    - shadow: system login tools
    
    Details:
    
    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                           1:4.1.5.1-1ubuntu9.5
      passwd                          1:4.1.5.1-1ubuntu9.5
      uidmap                          1:4.1.5.1-1ubuntu9.5
    
    In general, a standard system update will make all the necessary changes.
    
    References:
      http://www.ubuntu.com/usn/usn-3276-2
      http://www.ubuntu.com/usn/usn-3276-1
      https://launchpad.net/bugs/1690820
    
    Package Information:
      https://launchpad.net/ubuntu/+source/shadow/1:4.2-3.2ubuntu1.17.04.2
      https://launchpad.net/ubuntu/+source/shadow/1:4.2-3.2ubuntu1.16.10.2
      https://launchpad.net/ubuntu/+source/shadow/1:4.2-3.1ubuntu5.3
      https://launchpad.net/ubuntu/+source/shadow/1:4.1.5.1-1ubuntu9.5
    
    
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