Description
Vowpal Wabbit is a machine learning system. The workflow .github/workflows/python_checks.yml embeds ${{ github.event.pull_request.title }} directly inside double-quoted bash strings in four separate steps across four jobs, each passing it as a CLI argument to the Python test script run_tests_model_gen_and_load.py. The shell interprets the expanded string before invoking Python, allowing an attacker to break out of the quotes and execute arbitrary commands on the runner. The pull_request trigger fires on PRs targeting any branch (branches: ['*']), with no additional access gate. This vulnerability is fixed by the 998e390e80a7e8192d7849b7784bc113dbd190ad commit.
Problem types
CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
CWE-1336: Improper Neutralization of Special Elements Used in a Template Engine
Product status
References
github.com/...wabbit/security/advisories/GHSA-cg2g-xgg7-3xxq
github.com/...wabbit/security/advisories/GHSA-cg2g-xgg7-3xxq
github.com/...ommit/998e390e80a7e8192d7849b7784bc113dbd190ad