Absolute path traversal vulnerability in the handleStartDataFile function in DigiDocSAXParser.c in libdigidoc 3.6.0.0, as used in ID-software before 3.7.2 and other products, allows remote attackers to overwrite arbitrary files via a filename beginning with / (slash) or \ (backslash) in a DDOC file.
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.