GHSA-p749-9w62-w533 Tilt: Unauthenticated pprof debug endpoints on the Tilt HUD server

• Go github.com/tilt-dev/tilt: >= 0.19.5, < 0.37.4 → fixed in 0.37.4

Summary The Tilt HUD server mounts Go's `net/http/pprof` handlers under `/debug` with no access control. When the HUD is network-exposed, an attacker can read process memory — including session and apiserver tokens — and hold the process under profiling. Details A blank import of `net/http/pprof` registers its handlers on `http.DefaultServeMux`, which the HUD controller mounts under `/debug` on both the web router and the apiserver listener. `/debug/pprof/heap` and `/goroutine` expose process memory, including the session token (also issued in the `Tilt-Token` cookie) and the apiserver loopback bearer token; `/profile` and `/trace` let a caller sample the process for an arbitrary duration. Impact An unauthenticated caller who can reach the listener can extract process memory — including the session and apiserver tokens — and degrade performance by holding the process under CPU profiling or tracing. The leaked tokens compound the missing-authentication finding on the same server. Conditions for exploitation • Affected version in `>= 0.19.5, <= 0.37.3`. • HUD (or apiserver) listener bound to a non-loopback address (`tilt up --host 0.0.0.0`, or `TILT_HOST` set). • Network reachability to the listener (default port `10350`). Not affected • The default loopback-only bind is not reachable from the network. Workarounds Use the default loopback bind (omit `--host`, unset `TILT_HOST`) so `/debug` is not remotely reachable. No complete workaround short of upgrading for non-loopback deployments.