Directory traversal vulnerability in BisonFTP Server 4 release 2 allows remote attackers to (1) list directories above the root via an 'ls @../' command, or (2) list files above the root via a "mget @../FILE" command.
Improper Limitation of a Pathname to a Restricted 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.