Directory traversal vulnerability in the FTP server in YingZhi Python Programming Language for iOS 1.9 allows remote attackers to read and possibly write arbitrary files via a .. (dot dot) in the default URI.
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.