Netscape 6.2.3 and earlier, and Mozilla 1.0.1, allow remote attackers to corrupt heap memory and execute arbitrary code via a GIF image with a zero width.
bugzilla.mozilla.org/show_bug.cgi?id=157989
crash.ihug.co.nz/~Sneuro/zerogif/
marc.info/?l=bugtraq&m=103134051120770&w=2
www.iss.net/security_center/static/10058.php
www.mandrakesoft.com/security/advisories?name=MDKSA-2002:075
www.redhat.com/support/errata/RHSA-2002-192.html
www.redhat.com/support/errata/RHSA-2003-046.html
www.securityfocus.com/bid/5665