CVE-2024-27933

HIGH
Published Mar 21, 2024 Modified Jan 3, 2025 CWE-863

Description

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.

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CVSS v3.1 Score

8.2
HIGH
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Weakness Type (CWE)

CWE-863 Incorrect Authorization

Affected Products

Vendor Product
deno deno

References

Other References

https://github.com/denoland/deno/blob/v1.39.0/runtime/permissions/prompter.rs#L214 https://github.com/denoland/deno/blob/v1.39.0/runtime/permissions/prompter.rs#L220 https://github.com/denoland/deno/blob/v1.39.0/runtime/permissions/prompter.rs#L225 https://github.com/denoland/deno/blob/v1.39.0/runtime/permissions/prompter.rs#L241 https://github.com/denoland/deno/blob/v1.39.0/runtime/permissions/prompter.rs#L256 https://github.com/denoland/deno/blob/v1.39.0/runtime/permissions/prompter.rs#L265 https://github.com/denoland/deno/blob/v1.39.0/runtime/permissions/prompter.rs#L99 https://github.com/denoland/deno/commit/5a91a065b882215dde209baf626247e54c21a392 https://github.com/denoland/deno/blob/v1.39.0/runtime/permissions/prompter.rs#L214 https://github.com/denoland/deno/blob/v1.39.0/runtime/permissions/prompter.rs#L220

Frequently Asked Questions

What is 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. It has a CVSS v3.1 base score of 8.2 (HIGH).
How severe is CVE-2024-27933? +
CVE-2024-27933 has a CVSS v3.1 score of 8.2 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.
What products are affected by CVE-2024-27933? +
CVE-2024-27933 affects products from deno, specifically: deno. Check the affected products table above for specific version ranges.
How do I check if I'm vulnerable to CVE-2024-27933? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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