ViewVC before 1.0.5 stores sensitive information under the web root with insufficient access control, which allows remote attackers to read files and list folders under the hidden CVSROOT folder.
http://www.vupen.com/english/advisories/2008/0734/references
http://www.securityfocus.com/bid/28055
http://viewvc.tigris.org/source/browse/viewvc/trunk/CHANGES?rev=HEAD
http://security.gentoo.org/glsa/glsa-200803-29.xml
http://secunia.com/advisories/29460
http://secunia.com/advisories/29176