Advisoriesby IbisOS 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...
Affected versions
| Package | Affected | Fixed in |
|---|---|---|
| wrangler npm | >= 2.0.15, < 4.59.1 | 4.59.1 |
Details and references
**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.
- CVSS 4.0
- CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:N
- Severity from
- GitHub (reviewed advisory)
- Weakness
- CWE-78