Updated cvs packages that fix a client vulnerability that could be exploited by a malicious server are now available. [Updated Apr 19 2004] The description text has been updated to include CAN-2004-0405 which was also fixed but not mentioned when this advisory was first released. There has been no change to the packages associated with this advisory.
CVS is a version control system frequently used to manage source code repositories. Sebastian Krahmer discovered a flaw in CVS clients where rcs diff files can create files with absolute pathnames. An attacker could create a fake malicious CVS server that would cause arbitrary files to be created or overwritten when a victim connects to it. The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name CAN-2004-0180 to this issue. Derek Price discovered a vulnerability whereby a CVS pserver could be abused by a malicious client to view the contents of certain files outside of the CVS root directory using relative pathnames containing "../". The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name CAN-2004-0405 to this issue. Users of CVS are advised to upgrade to these erratum packages, which contain a patch correcting this issue.