Directory traversal vulnerability exists in A.K.I Software's PMailServer/PMailServer2 products' CGIs included in Internal Simple Webserver. If this vulnerability is exploited, a remote attacker may access arbitrary files outside DocumentRoot.
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.