8.2 High
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
0.0004 Low
EPSS
Percentile
13.0%
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.
github.com/denoland/deno/blob/v1.39.0/runtime/permissions/prompter.rs#L214
github.com/denoland/deno/blob/v1.39.0/runtime/permissions/prompter.rs#L220
github.com/denoland/deno/blob/v1.39.0/runtime/permissions/prompter.rs#L225
github.com/denoland/deno/blob/v1.39.0/runtime/permissions/prompter.rs#L241
github.com/denoland/deno/blob/v1.39.0/runtime/permissions/prompter.rs#L256
github.com/denoland/deno/blob/v1.39.0/runtime/permissions/prompter.rs#L265
github.com/denoland/deno/blob/v1.39.0/runtime/permissions/prompter.rs#L99
github.com/denoland/deno/commit/55fac9f5ead6d30996400e8597c969b675c5a22b
github.com/denoland/deno/commit/5a91a065b882215dde209baf626247e54c21a392
github.com/denoland/deno/security/advisories/GHSA-6q4w-9x56-rmwq