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Ubuntu Security Notice USN-3276-3
November 14, 2017

shadow vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 12.04 ESM

Summary:

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

Software Description:
- shadow: system login tools

Details:

USN-3276-1 and USN-3276-2 fixed vulnerabilities in shadow. This update
provides the corresponding update for Ubuntu 12.04 ESM.

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)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 12.04 ESM:
  login                           1:4.1.4.2+svn3283-3ubuntu5.2
  passwd                          1:4.1.4.2+svn3283-3ubuntu5.2

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

References:
  https://www.ubuntu.com/usn/usn-3276-3
  https://www.ubuntu.com/usn/usn-3276-1
  CVE-2017-2616