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Ubuntu Security Notice USN-3962-1
April 30, 2019

libpng1.6 vulnerability
==========================================================================

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

- Ubuntu 18.10
- Ubuntu 18.04 LTS

Summary:

libpng be made to crash or run programs if it opened a specially crafted
file.

Software Description:
- libpng1.6: PNG (Portable Network Graphics) file library

Details:

It was discovered that libpng incorrectly handled certain memory
operations. If a user or automated system were tricked into opening a
specially crafted PNG file, a remote attacker could use this issue to
cause libpng to crash, resulting in a denial of service, or possibly
execute arbitrary code.

Update instructions:

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

Ubuntu 18.10:
  libpng16-16                     1.6.34-2ubuntu0.1

Ubuntu 18.04 LTS:
  libpng16-16                     1.6.34-1ubuntu0.18.04.2

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

References:
  https://usn.ubuntu.com/usn/usn-3962-1
  CVE-2019-7317

Package Information:
  https://launchpad.net/ubuntu/+source/libpng1.6/1.6.34-2ubuntu0.1
  https://launchpad.net/ubuntu/+source/libpng1.6/1.6.34-1ubuntu0.18.04.2