Directory traversal vulnerability in src/torrent_info.cpp in Rasterbar libtorrent before 0.14.4, as used in firetorrent, qBittorrent, deluge Torrent, and other applications, allows remote attackers to create or overwrite arbitrary files via a .. (dot dot) and partial relative pathname in a Multiple File Mode list element in a .torrent file.
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.