An arbitrary file write issue in the exfiltration endpoint in BYOB (Build Your Own Botnet) 2.0 allows attackers to overwrite SQLite databases and bypass authentication via an unauthenticated HTTP request with a crafted parameter. This occurs in file_add in api/files/routes.py.
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.