==========================================================================
Ubuntu Security Notice USN-3712-1
July 11, 2018

libpng, libpng1.6 vulnerabilities
==========================================================================

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

- Ubuntu 18.04 LTS
- Ubuntu 17.10
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS

Summary:

Several security issues were fixed in libpng.

Software Description:
- libpng1.6: PNG library - development (version 1.6)
- libpng: PNG (Portable Network Graphics) file library

Details:

Patrick Keshishian discovered that libpng incorrectly handled certain
PNG files. An attacker could possibly use this to cause a denial of
service. This issue only affected Ubuntu 14.04 LTS and Ubuntu 16.04
LTS. (CVE-2016-10087)

Thuan Pham discovered that libpng incorrectly handled certain PNG
files. An attacker could possibly use this to cause a denial of
service. This issue only affected Ubuntu 17.10 and Ubuntu 18.04 LTS.
(CVE-2018-13785)

Update instructions:

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

Ubuntu 18.04 LTS:
  libpng16-16                     1.6.34-1ubuntu0.18.04.1

Ubuntu 17.10:
  libpng16-16                     1.6.34-1ubuntu0.17.10.1

Ubuntu 16.04 LTS:
  libpng12-0                      1.2.54-1ubuntu1.1

Ubuntu 14.04 LTS:
  libpng12-0                      1.2.50-1ubuntu2.14.04.3

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

References:
  https://usn.ubuntu.com/usn/usn-3712-1
  CVE-2016-10087, CVE-2018-13785

Package Information:
  https://launchpad.net/ubuntu/+source/libpng1.6/1.6.34-1ubuntu0.18.04.
1
  https://launchpad.net/ubuntu/+source/libpng1.6/1.6.34-1ubuntu0.17.10.
1
  https://launchpad.net/ubuntu/+source/libpng/1.2.54-1ubuntu1.1
  https://launchpad.net/ubuntu/+source/libpng/1.2.50-1ubuntu2.14.04.3