It was discovered that Tk, a cross-platform graphical toolkit for Tcl, performs insufficient input validation in the code used to load GIF images, which may lead to the execution of arbitrary code.
For the old stable distribution (sarge), this problem has been fixed in version 8.4.9-1sarge1.
For the stable distribution (etch), this problem has been fixed in version 8.4.12-1etch1.
We recommend that you upgrade your tk8.4 packages. Updated packages for sparc will be provided later.
MD5 checksums of the listed files are available in the original advisory.