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[SECURITY] [DLA 1196-1] optipng security update

Package        : optipng
Version        : 0.6.4-1+deb7u4
CVE ID         : CVE-2017-16938
Debian Bug     : 878839

optipng, an advanced PNG (Portable Network Graphics) optimizer, has
been found vulnerable to a buffer overflow which allows remote
attackers to cause a denial-of-service attack or other unspecified
impact with a maliciously crafted GIF format file, related to an
uncontrolled loop in the LZWReadByte function of the gifread.c file.

For Debian 7 "Wheezy", these problems have been fixed in version

We recommend that you upgrade your optipng packages.

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

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