cvs: code execution

An array index error, leading to heap-based buffer overflow was found in the way CVS version control system applied certain delta fragments changes from input file in the RCS (Revision Control System file) format. A local attacker could store a specially-crafted RCS file into the CVS repository and trick the remote victim to checkout (update their CVS repository tree) with this file, which could lead to arbitrary code execution with the privileges of the user running cvs client executable.