Directory traversal vulnerability in the bitrix.xscan module before 1.0.4 for Bitrix allows remote authenticated users to rename arbitrary files, and consequently obtain sensitive information or cause a denial of service, via a .. (dot dot) in the file parameter to admin/bitrix.xscan_worker.php.
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.