==========================================================================
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—–BEGIN PGP SIGNATURE—–
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==========================================================================
Ubuntu Security Notice USN-3712-2
July 11, 2018

libpng vulnerability
==========================================================================

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
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