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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
0.6.4-1+deb7u4.

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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