Updated XEmacs packages that fix a string format issue are now available for Red Hat Enterprise Linux 4. This update has been rated as having important security impact by the Red Hat Security Response Team.
XEmacs is a powerful, customizable, self-documenting, modeless text editor. Max Vozeler discovered several format string vulnerabilities in the movemail utility of XEmacs. If a user connects to a malicious POP server, an attacker can execute arbitrary code as the user running xemacs. The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name CAN-2005-0100 to this issue. Users of XEmacs are advised to upgrade to these updated packages, which contain backported patches to correct this issue.