Debian 10: DLA-3223-1 Critical: giflib Buffer Overflow and DoS Risk

CVE-2018-11490

The DGifDecompressLine function in dgif_lib.c, as later shipped in
cgif.c in sam2p 0.49.4, has a heap-based buffer overflow because a
certain "Private->RunningCode - 2" array index is not checked. This
will lead to a denial of service or possibly unspecified other
impact.

CVE-2019-15133

A malformed GIF file triggers a divide-by-zero exception in the
decoder function DGifSlurp in dgif_lib.c if the height field of the
ImageSize data structure is equal to zero.

For Debian 10 buster, these problems have been fixed in version
5.1.4-3+deb10u1.

We recommend that you upgrade your giflib packages.

For the detailed security status of giflib please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/source-package/giflib

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