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EUVD-2026-9573

fkie_cve-2024-27933

Deno is a JavaScript, TypeScript, and WebAssembly runtime. In version 1.39.0, use of raw file descriptors in `op_node_ipc_pipe()` leads to premature close of arbitrary file descriptors, allowing standard input to be re-opened as a different resource resulting in permission prompt bypass. Node child_process IPC relies on the JS side to pass the raw IPC file descriptor to `op_node_ipc_pipe()`, which returns a `IpcJsonStreamResource` ID associated with the file descriptor. On closing the resource, the raw file descriptor is closed together.

Use of raw file descriptors in `op_node_ipc_pipe()` leads to premature close of arbitrary file descriptors. This allow standard input (fd 0) to be closed and re-opened for a different resource, which allows a silent permission prompt bypass. This is exploitable by an attacker controlling the code executed inside a Deno runtime to obtain arbitrary code execution on the host machine regardless of permissions.

This bug is known to be exploitable. There is a working exploit that achieves arbitrary code execution by bypassing prompts from zero permissions, additionally abusing the fact that Cache API lacks filesystem permission checks. The attack can be conducted silently as stderr can also be closed, suppressing all prompt outputs.

Version 1.39.1 fixes the bug.

GHSA-6q4w-9x56-rmwq — Deno arbitrary file descriptor close via `op_node_ipc_pipe()` leading to permission prompt bypass

Affected: crates.io: deno

### Summary

Use of raw file descriptors in `op_node_ipc_pipe()` leads to premature close of arbitrary file descriptors, allowing standard input to be re-opened as a different resource resulting in permission prompt bypass.

### Details

Node child_process IPC relies on the JS side to pass the raw IPC file descriptor to `op_node_ipc_pipe()`, which returns a `IpcJsonStreamResource` ID associated with the file descriptor. On closing the resource, the raw file descriptor is closed together.

Although closing a file descriptor is seemingly a harmless task, this has been known to be exploitable: - With `--allow-read` and `--allow-write` permissions, one can open `/dev/ptmx` as stdin. This device happily accepts TTY ioctls and pipes anything written into it back to the reader. - This has been presented in a hacking competition (WACON 2023 Quals "dino jail"). - However, the precondition of this challenge was heavily contrived: fd 0 has manually been closed by FFI and `setuid()` was used to drop permissions and deny access to `/proc` since global write permissions are usually equivalent to arbitrary code execution (`/proc/self/mem`).

As this vulnerability conveniently allows us to close stdin (fd 0) without any FFI, we can open any resource that when read returns `y`, `Y` or `A` as its first character ([runtimes/permissions/prompter.rs](https://github.com/denoland/deno/blob/v1.39.0/runtime/permissions/prompter.rs#L265)) to bypass the prompt.

There is a caveat however - all s…

Most recent entries from all

EUVD-2026-9573

fkie_cve-2024-27933

GHSA-6q4w-9x56-rmwq — Deno arbitrary file descriptor close via `op_node_ipc_pipe()` leading to permission prompt bypass

gsd-2024-27933