=========================================================================Ubuntu Security Notice USN-5432-1
May 23, 2022

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

- Ubuntu 16.04 ESM

Summary:

Several security issues were fixed in libpng.

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

Details:

It was discovered that libpng incorrectly handled memory when parsing
certain PNG files. If a user or automated system were tricked into opening
a specially crafted PNG file, an attacker could use this issue to cause
libpng to crash, resulting in a denial of service, or possible execute
arbitrary code. (CVE-2017-12652)

Zhengxiong Luo discovered that libpng incorrectly handled memory when parsing
certain PNG files. If a user or automated system were tricked into opening
a specially crafted PNG file, an attacker could use this issue to cause
libpng to crash, resulting in a denial of service, or possible execute
arbitrary code. (CVE-2018-14048)

Update instructions:

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

Ubuntu 16.04 ESM:
  libpng12-0                      1.2.54-1ubuntu1.1+esm1
  libpng12-dev                    1.2.54-1ubuntu1.1+esm1
  libpng3                         1.2.54-1ubuntu1.1+esm1

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

References:
  https://ubuntu.com/security/notices/USN-5432-1
  CVE-2017-12652, CVE-2018-14048