Coordinated Disclosure Timeline
- 2021-01-18-2021-01-21: Report sent to various maintainers.
- 2021-01-22: Maintainers acknowledged.
- 2021-01-22: Issue resolved.
Summary
GitHub workflow in pythonpune/meetup-talks GitHub repository repository is vulnerable to arbitrary code execution from user comments.
Product
pythonpune/meetup-talks GitHub repository repository
Tested Version
The latest changeset notifications.yml to the date.
Details
Issue: A comment body is used to format a shell command
on:
issue_comment:
types: [created]
issues:
types: [opened]
...
- name: comment
run: echo "${{ github.event.comment.body }}"
Impact
This vulnerability allows for arbitrary command injection into the bash script which allows for unauthorized modification of the base repository and secrets exfiltration. For a proof a concept comment on an issue with a"; exit 1.
Credit
This issue was discovered and reported by GHSL team member @JarLob (Jaroslav Lobačevski).
Contact
You can contact the GHSL team at securitylab@github.com, please include a reference to GHSL-2021-013 in any communication regarding this issue.