Javier Fernandez-Sanguino Pena discovered that several tools in the cfengine package (vicf, cfmailfilter, and cfcron) create and use temporary files in an insecure way. A local attacker could exploit this with a symlink attack to create or overwrite arbitrary files with the privileges of the user running the cfengine program.
Solution: The problem can be corrected by upgrading the affected package to version 1.6.5-1ubuntu0.4.10.1 (for Ubuntu 4.10), or 1.6.5-1ubuntu0.5.04.1 (for Ubuntu 5.04). In general, a standard system upgrade is sufficient to effect the necessary changes. http://www.securityspace.com/smysecure/catid.html?in=USN-198-1