Debian Security Advisory 1598-1 – It was discovered that a buffer overflow in the GIF image parsing code of Tk, a cross-platform graphical toolkit, could lead to denial of service and potentially the execution of arbitrary code.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/67517/dsa-1598-1.txt
Source: https://packetstormsecurity.com/files/67517/Debian-Linux-Security-Advisory-1598-1.html