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Not in CISA KEV
MEDIUM severity

GHSA-wj7f-468m-6mv8 — birdcage

MEDIUM

GHSA-wj7f-468m-6mv8 is a medium-severity (CVSS 4) vulnerability in birdcage. A fix is available for birdcage — see the affected versions and patch details below.

Environment variables still accessible through /proc

Published
Dec 1, 2023
Updated
Dec 1, 2023
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Dec 1, 2023 · OSV.dev, FIRST.org (EPSS)

Real-World Exposure

1 pkg affected
🦀birdcage

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects crates.io packages — download data is not available via public APIs for these ecosystems.

Description

Impact

Environment variables can be read from procfs unless a new process is started.

PoC

use birdcage::{Birdcage, Sandbox};
use std::{env, fs};

fn main() {
    Birdcage::new().lock().unwrap();

    assert_eq!(env::var_os("SECRET"), None);

    let environ = fs::read_to_string("/proc/self/environ").unwrap();
    assert!(!environ.contains("SECRET"), "ENVIRON CONTAINS SECRET:\n{environ}");
}

$  SECRET=test cargo run
thread 'main' panicked at src/main.rs:10:5:
ENVIRON CONTAINS SECRET:
 [truncated]

Possible Solutions

The simplest solution would be relying on the ptrace isolation and always spawning a new process by changing birdcage's API to create a new command. With an additional PID namespace the guarantees could be even further reinforced.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🦀crates.iobirdcageall versions0.7.0cargo update -p birdcage --precise 0.7.0

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for birdcage, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update birdcage to 0.7.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-wj7f-468m-6mv8 is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

  4. How O3 protects you

    O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like GHSA-wj7f-468m-6mv8 can be triaged on real exposure rather than presence alone.

Tailored to GHSA-wj7f-468m-6mv8. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

Frequently Asked Questions

### Impact Environment variables can be read from procfs unless a new process is started. ### PoC ``` use birdcage::{Birdcage, Sandbox}; use std::{env, fs}; fn main() { Birdcage::new().lock().unwrap(); assert_eq!(env::var_os("SECRET"), None); let environ = fs::read_to_string("/proc/self/environ").unwrap(); assert!(!environ.contains("SECRET"), "ENVIRON CONTAINS SECRET:\n{environ}"); } ``` ``` $ SECRET=test cargo run thread 'main' panicked at src/main.rs:10:5: ENVIRON CONTAINS SECRET: [truncated] ``` ### Possible Solutions The simplest solution would be relying on the
O3 Security · Impact-Aware SCA

Is GHSA-wj7f-468m-6mv8 in your dependencies?

O3 Security finds GHSA-wj7f-468m-6mv8 across crates.io dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.

Scan my dependencies How O3 SCA works
GHSA-wj7f-468m-6mv8: birdcage (Medium 4) | O3 Security