Summary
Azure Pipelines and GitHub Actions allow deployment of runners and agents using VM images sourced from a GitHub-managed
repository (github.com/actions/runner-images). This repo was misconfigured to use self-hosted runners insecurely,
in a way that could have allowed a malicious external contributor (i.e., anyone who had previously had at least one PR
approved and merged in the repo) to poison the repository and achieve code execution on runners in the repo. This in turn
could have theoretically allowed an attacker to modify the source code of the images, and thereby conduct a supply chain
attack against Pipelines and Actions customers.
Affected Services
Pipelines
Remediation
None required
Tracked CVEs
No tracked CVEs
References
Contributed by https://github.com/korniko98
Disclosure Date
Sat, Jul 22nd, 2023
Exploitablity Period
Until 2023/07/26
Known ITW Exploitation
-
Detection Methods
-
Piercing Index Rating
-
Discovered by
Adnan Khan
