Debian: DSA-3443-1 Critical: Libpng Denial of Service Vulnerability

CVE-2015-8472

It was discovered that the original fix for CVE-2015-8126 was
incomplete and did not detect a potential overrun by applications
using png_set_PLTE directly. A remote attacker can take advantage of
this flaw to cause a denial of service (application crash).

CVE-2015-8540

Xiao Qixue and Chen Yu discovered a flaw in the png_check_keyword
function. A remote attacker can potentially take advantage of this
flaw to cause a denial of service (application crash).

For the oldstable distribution (wheezy), these problems have been fixed
in version 1.2.49-1+deb7u2.

For the stable distribution (jessie), these problems have been fixed in
version 1.2.50-2+deb8u2.

We recommend that you upgrade your libpng packages.

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/