User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file.
The specific flaw exists within the function LaunchProcess exposed via the LaunchHelp.dll ActiveX Control (ProgID LaunchHelp.HelpLauncher.1). The first argument to LaunchProcess is a path to a command to execute, but the argument is not sanitized and is subject to directory traversal. This can be exploited to execute arbitrary commands on the user's system.