Updated XEmacs packages that fix a string format issue are now available for CentOS 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.