An updated wu-ftpd package that fixes two security issues is now available.
The wu-ftpd package contains the Washington University FTP (File Transfer Protocol) server daemon. FTP is a method of transferring files between machines. Glenn Stewart discovered a flaw in wu-ftpd. When configured with "restricted-gid home", an authorized user could use this flaw to circumvent the configured home directory restriction by using chmod. The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name CAN-2004-0148 to this issue. Michael Hendrickx found a flaw in the S/Key login handling. On servers using S/Key authentication, a remote attacker could overflow a buffer and potentially execute arbitrary code. Users of wu-ftpd are advised to upgrade to this updated package, which contains backported security patches and is not vulnerable to these issues.