Fedora: 21: 2004-170 Critical: CVS Multiple Exploits and Risks

CVS (Concurrent Version System) is a version control system that can

record the history of your files (usually, but not always, source

code). CVS only stores the differences between versions, instead of

every version of every file you have ever created. CVS also keeps a log

of who, when, and why changes occurred.

CVS is very helpful for managing releases and controlling the

concurrent editing of source files among multiple authors. Instead of

providing version control for a collection of files in a single

directory, CVS provides version control for a hierarchical collection

of directories consisting of revision controlled files. These

directories and files can then be combined together to form a software

release.

CVS (Concurrent Version System) is a version control system that can

record the history of your files (usually, but not always, source

code). CVS only stores the differences between versions, instead of

every version of every file you have ever created. CVS also keeps a log

of who, when, and why changes occurred.

CVS is very helpful for managing releases and controlling the

concurrent editing of source files among multiple authors. Instead of

providing version control for a collection of files in a single

directory, CVS provides version control for a hierarchical collection

of directories consisting of revision controlled files. These

directories and files can then be combined together to form a software

release.

While investigating a previously fixed vulnerability, Derek Price discovered a flaw relating to malformed "Entry" lines which lead to a missing NULL terminator. The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name CAN-2004-0414 to this issue.

Stefan Esser and Sebastian Krahmer conducted an audit of CVS and fixed a number of issues that may have had security consequences.

Among the issues deemed likely to be exploitable were:

-- a double-free relating to the error_prog_name string (CAN-2004-0416) -- an argument integer overflow (CAN-2004-0417) -- out-of-bounds writes in serv_notify (CAN-2004-0418).

An attacker who has access to a CVS server may be able to execute arbitrary code under the UID on which the CVS server is executing.

Users of CVS are advised to upgrade to this updated package, which updates the cvs package to version 1.11.17, which corrects these issues.

Red Hat would like to thank Stefan Esser, Sebastian Krahmer, and Derek Price for audi...