Headline

GHSA-36p8-mvp6-cv38: Wrangler affected by OS Command Injection in `wrangler pages deploy`

Summary

A command injection vulnerability (CWE-78) has been found to exist in the wrangler pages deploy command. The issue occurs because the --commit-hash parameter is passed directly to a shell command without proper validation or sanitization, allowing an attacker with control of --commit-hash to execute arbitrary commands on the system running Wrangler.

Root cause

The commitHash variable, derived from user input via the --commit-hash CLI argument, is interpolated directly into a shell command using template literals (e.g., execSync(`git show -s --format=%B ${commitHash}`)). Shell metacharacters are interpreted by the shell, enabling command execution.

Impact

This vulnerability is generally hard to exploit, as it requires --commit-hash to be attacker controlled. The vulnerability primarily affects CI/CD environments where wrangler pages deploy is used in automated pipelines and the --commit-hash parameter is populated from external, potentially untrusted sources. An attacker could exploit this to:

Run any shell command.
Exfiltrate environment variables.
Compromise the CI runner to install backdoors or modify build artifacts.

Mitigation

Wrangler v4 users are requested to upgrade to Wrangler v4.59.1 or higher.
Wrangler v3 users are requested to upgrade to Wrangler v3.114.17 or higher.
Users on Wrangler v2 (EOL) should upgrade to a supported major version.

Credits

Disclosed responsibly by kny4hacker.

2 hours ago

ghsa

Open in Source

#vulnerability #git #backdoor

Summary

A command injection vulnerability (CWE-78) has been found to exist in the wrangler pages deploy command. The issue occurs because the --commit-hash parameter is passed directly to a shell command without proper validation or sanitization, allowing an attacker with control of --commit-hash to execute arbitrary commands on the system running Wrangler.

Root cause

The commitHash variable, derived from user input via the --commit-hash CLI argument, is interpolated directly into a shell command using template literals (e.g., execSync(git show -s --format=%B ${commitHash})). Shell metacharacters are interpreted by the shell, enabling command execution.

Impact

This vulnerability is generally hard to exploit, as it requires --commit-hash to be attacker controlled. The vulnerability primarily affects CI/CD environments where wrangler pages deploy is used in automated pipelines and the --commit-hash parameter is populated from external, potentially untrusted sources. An attacker could exploit this to: