CVS, which stands for Concurrent Versions System, is a client/server application which tracks changes to sets of files. It allows multiple users to work concurrently on files, and then merge their changes back into the main tree (which can be on a remote system). It also allows branching, or maintaining separate versions for files.
Quote from ccvs.cvshome.org/servlets/NewsItemView?newsID=84: "Stable CVS 1.11.10 has been released. Stable releases contain only bug fixes from previous versions of CVS. This release fixes a security issue with no known exploits that could cause previous versions of CVS to attempt to create files and directories in the filesystem root. This release also fixes several issues relevant to case insensitive filesystems and some other bugs. We recommend this upgrade for all CVS clients and servers!"
Attempts to create files and directories outside the repository may be possible.
There is no known workaround at this time.
All Gentoo Linux machines with cvs installed should be updated to use dev-util/cvs-1.11.10 or higher:
# emerge sync
# emerge -pv '>=dev-util/cvs-1.11.10'
# emerge '>=dev-util/cvs-1.11.10'
# emerge clean