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GHSA-2m9h-r57g-45pj

Downloading malicious GitHub Actions workflow artifact results in path traversal vulnerability

Source: GitHub Advisory Database (reviewed) Moderate CVE-2024-54132

Packages

EcosystemPackageAffectedFixed in
Go github.com/cli/cli/v2 < 2.63.1 2.63.1
Go github.com/cli/cli <= 1.14.0 no fix listed

Details

As written in the advisory (Markdown source, shown as plain text).

### Summary A security vulnerability has been identified in GitHub CLI that could create or overwrite files in unintended directories when users download a malicious GitHub Actions workflow artifact through `gh run download`. ### Details This vulnerability stems from a GitHub Actions workflow artifact named `..` when downloaded using `gh run download`. The artifact name and `--dir` flag are used to determine the artifact’s download path. When the artifact is named `..`, the resulting files within the artifact are extracted exactly 1 directory higher than the specified `--dir` flag value. In `2.63.1`, `gh run download` will not download artifacts named `..` and `.` and instead exit with the following error message: ``` error downloading ..: would result in path traversal ``` ### Impact Successful exploitation heightens the risk of local path traversal attack vectors exactly 1 directory higher than intended. ### Remediation and Mitigation 1. Upgrade `gh` to `2.63.1` 2. Implement additional validation to ensure artifact filenames do not contain potentially dangerous patterns, such as `..`, to prevent path traversal risks.

References

External links from the advisory. They lead to third-party sites.