The following updates has been released for Ubuntu Linux:

USN-3276-3: shadow vulnerability
USN-3478-2: Perl vulnerability

USN-3276-3: shadow vulnerability

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

shadow vulnerability
==========================================================================

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

USN-3478-2: Perl vulnerability

==========================================================================
Ubuntu Security Notice USN-3478-2
November 13, 2017

perl vulnerability
==========================================================================

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

- Ubuntu 12.04 ESM

Summary:

Perl could be made to crash if it received specially crafted
input.

Software Description:
- perl: Practical Extraction and Report Language

Details:

USN-3478-1 fixed two vulnerabilities in Perl. This update
provides the corresponding update for Ubuntu 12.04 ESM.

Original advisory details:

 Jakub Wilk discovered that Perl incorrectly handled certain regular
 expressions. An attacker could use this issue to cause Perl to crash,
 resulting in a denial of service, or possibly execute arbitrary code.
 (CVE-2017-12883)

Update instructions:

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

Ubuntu 12.04 ESM:
  perl 5.14.2-6ubuntu2.6

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

References:
  https://www.ubuntu.com/usn/usn-3478-2
  https://www.ubuntu.com/usn/usn-3478-1
  CVE-2017-12883