==========================================================================
Ubuntu Security Notice USN-3276-1
May 05, 2017

shadow vulnerabilities
==========================================================================

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:

su could be made to crash or stop programs as an administrator.

Software Description:
– shadow: system login tools

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 1:4.2-3.2ubuntu1.17.04.1
passwd 1:4.2-3.2ubuntu1.17.04.1
uidmap 1:4.2-3.2ubuntu1.17.04.1

Ubuntu 16.10:
login 1:4.2-3.2ubuntu1.16.10.1
passwd 1:4.2-3.2ubuntu1.16.10.1
uidmap 1:4.2-3.2ubuntu1.16.10.1

Ubuntu 16.04 LTS:
login 1:4.2-3.1ubuntu5.2
passwd 1:4.2-3.1ubuntu5.2
uidmap 1:4.2-3.1ubuntu5.2

Ubuntu 14.04 LTS:
login 1:4.1.5.1-1ubuntu9.4
passwd 1:4.1.5.1-1ubuntu9.4
uidmap 1:4.1.5.1-1ubuntu9.4

In general, a standard system update will make all the necessary changes.

References:
http://www.ubuntu.com/usn/usn-3276-1
CVE-2016-6252, CVE-2017-2616

Package Information:
https://launchpad.net/ubuntu/+source/shadow/1:4.2-3.2ubuntu1.17.04.1
https://launchpad.net/ubuntu/+source/shadow/1:4.2-3.2ubuntu1.16.10.1
https://launchpad.net/ubuntu/+source/shadow/1:4.2-3.1ubuntu5.2
https://launchpad.net/ubuntu/+source/shadow/1:4.1.5.1-1ubuntu9.4

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