Stable Diffusion WebUI vulnerabilities

Stable Diffusion WebUI through 1.10.1 contains a credential disclosure vulnerability in the /sdapi/v1/cmd-flags endpoint that returns parsed command-line arguments including gradio_auth and api_auth values in cleartext. Unauthenticated attackers can access this endpoint to retrieve configured usernames and passwords, then use them to authenticate to the interface and access the application.

to_abs_path in scripts/iib/tool.py normalizes the path with os.path.normpath, which does not resolve symbolic links. A symlink placed inside a scanned directory can point outside that directory, and FileResponse follows the link, disclosing files such as /etc/passwd.

is_path_trusted in scripts/iib/api.py compares the requested path against allowed parent directories with path.startswith(parent_path), without appending a path separator. A directory whose name merely begins with an allowed path satisfies the comparison, allowing access to files outside the allowed directory.