Relative Path Traversal vulnerability in ABB Zenon 8.20 allows the user to access files on the Zenon system and user also can add own log messages and e.g., flood the log entries. An attacker who successfully exploit the vulnerability could access the Zenon runtime activities such as the start and stop of various activity and the last error code etc.
The product uses external input to construct a pathname that should be within a restricted directory, but it does not properly neutralize sequences such as ".." that can resolve to a location that is outside of that directory.
The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.