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Ubuntu Security Notice USN-3712-2
July 11, 2018

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

- Ubuntu 12.04 ESM

Summary:

libpng could be made to crash if it received a specially crafted file.

Software Description:
- libpng: PNG (Portable Network Graphics) file library

Details:

USN-3712-1 fixed a vulnerability in libpng. This update provides
the corresponding update for Ubuntu 12.04 ESM.

Original advisory details:

 Patrick Keshishian discovered that libpng incorrectly handled certain
 PNG files. An attacker could possibly use this to cause a denial of
 service.

Update instructions:

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

Ubuntu 12.04 ESM:
  libpng12-0                      1.2.46-3ubuntu4.3

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

References:
  https://usn.ubuntu.com/usn/usn-3712-2
  https://usn.ubuntu.com/usn/usn-3712-1
  CVE-2016-10087