Mjkim610

Two shell scripts, `pihole-FTL-prestart.sh` and `pihole-FTL-poststop.sh`, executed as root by systemd, read the `files.pid` path from the configuration without validation and use it in privileged file operations. An attacker with pihole privileges can write an arbitrary path into `files.pid` to cause the root user to delete and recreate any file on the system outside the ProtectSystem=full-restricted directories, granting write access to those files. On default installations, this allows local privilege escalation to root through the manipulation of SSH authorized keys.

Request-line validation can be bypassed when a `DefaultHttpRequest` or `DefaultFullHttpRequest` is created and its URI is subsequently modified using the `setUri()` function. While constructors reject CRLF (Carriage Return Line Feed) and whitespace characters to prevent start-line corruption, `setUri()` does not perform this validation. Consequently, `HttpRequestEncoder` and `RtspEncoder` write the URI into the request line verbatim. If attacker-controlled input is passed to `setUri()`, it enables CRLF injection and the insertion of additional HTTP or RTSP requests. This can lead to HTTP request smuggling, desynchronization on the HTTP side, and request injection on the RTSP side.