Multiple vulnerabilities have been reported in CVS, where one has an unknown impact and others which can be exploited by malicious people to cause a DoS (Denial of Service) and compromise a vulnerable system.

1) A boundary error in the CVS client during processing of version and author information can be exploited to cause a buffer overflow and execute arbitrary code by tricking a user into connecting to a malicious CVS server.

2) Some memory leaks and NULL pointer dereferences may be exploited to cause a DoS.

3) An unspecified error caused due to an arbitrary free has an unknown impact.

4) Some errors in the contributed Perl scripts can be exploited to execute arbitrary code via a malicious Perl library.

Successful exploitation requires that the user has commit access and that one of the contributed Perl scripts has been installed improperly.

Solution
Update to version 1.11.20.
Further details available in Customer Area

Provided and/or discovered by
1-3) Alen Zukich
4) Craig Monson

Changelog
Further details available in Customer Area

Original Advisory
https://ccvs.cvshome.org/source/browse/ccvs/NEWS?rev=1.116.2.127&content-type=text/x-cvsweb-markup

Deep Links
Links available in Customer Area