Ecosyste.ms: Advisories

Security Advisories: GSA_kwCzR0hTQS00bXE0LTdydzMtdm01as4AA3ui

Wasmer filesystem sandbox not enforced

Summary

As of Wasmer version v4.2.3, Wasm programs can access the filesystem outside of the sandbox.

Details

https://github.com/wasmerio/wasmer/issues/4267

PoC

A minimal Rust program:

fn main() {
    let f = std::fs::OpenOptions::new()
        .write(true)
        .create_new(true)
        .open("abc")
        .unwrap();
}

This should be compiled with cargo build --target wasm32-wasi. The compiled program, when run with wasmer WITHOUT --dir, can still create a file in the working directory.

Impact

Service providers running untrusted Wasm code on Wasmer can unexpectedly expose the host filesystem.

Permalink: https://github.com/advisories/GHSA-4mq4-7rw3-vm5j
JSON: https://advisories.ecosyste.ms/api/v1/advisories/GSA_kwCzR0hTQS00bXE0LTdydzMtdm01as4AA3ui
Source: GitHub Advisory Database
Origin: Unspecified
Severity: High
Classification: General
Published: 12 months ago
Updated: 11 months ago

CVSS Score: 8.4
CVSS vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Identifiers: GHSA-4mq4-7rw3-vm5j, CVE-2023-51661
References:

• https://github.com/wasmerio/wasmer/security/advisories/GHSA-4mq4-7rw3-vm5j
• https://github.com/wasmerio/wasmer/issues/4267
• https://nvd.nist.gov/vuln/detail/CVE-2023-51661
• https://github.com/wasmerio/wasmer/commit/4d63febf9d8b257b0531963b85df48d45d0dbf3c
• https://github.com/wasmerio/wasmer/commit/e3923612c23123025c26f982d390e34df7df030f
• https://github.com/advisories/GHSA-4mq4-7rw3-vm5j

Repository: https://github.com/wasmerio/wasmer
Blast Radius: 1.0

Affected Packages