Vulnerability Details : CVE-2023-27581
github-slug-action is a GitHub Action to expose slug value of GitHub environment variables inside of one's GitHub workflow. Starting in version 4.0.0` and prior to version 4.4.1, this action uses the `github.head_ref` parameter in an insecure way. This vulnerability can be triggered by any user on GitHub on any workflow using the action on pull requests. They just need to create a pull request with a branch name, which can contain the attack payload. This can be used to execute code on the GitHub runners and to exfiltrate any secrets one uses in the CI pipeline. A patched action is available in version 4.4.1. No workaround is available.
Vulnerability category: Execute code
Products affected by CVE-2023-27581
- Github-slug-action Project » Github-slug-actionVersions from including (>=) 4.0.0 and before (<) 4.4.1cpe:2.3:a:github-slug-action_project:github-slug-action:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2023-27581
0.18%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 56 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2023-27581
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
8.8
|
HIGH | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
2.8
|
5.9
|
NIST | |
|
8.8
|
HIGH | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
2.8
|
5.9
|
GitHub, Inc. |
CWE ids for CVE-2023-27581
-
The product constructs all or part of a command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended command when it is sent to a downstream component.Assigned by: security-advisories@github.com (Primary)
References for CVE-2023-27581
-
https://github.com/rlespinasse/github-slug-action/commit/102b1a064a9b145e56556e22b18b19c624538d94
fix: use github.head_ref env var as trusted input · rlespinasse/github-slug-action@102b1a0 · GitHubPatch
-
https://securitylab.github.com/research/github-actions-untrusted-input/
Keeping your GitHub Actions and workflows secure Part 2: Untrusted input | GitHub Security LabExploit;Third Party Advisory
-
https://github.com/rlespinasse/github-slug-action/releases/tag/v4.4.1
Release v4.4.1 · rlespinasse/github-slug-action · GitHubRelease Notes
-
https://github.com/rlespinasse/github-slug-action/security/advisories/GHSA-6q4m-7476-932w
github-slug-action vulnerable to arbitrary code execution · Advisory · rlespinasse/github-slug-action · GitHubVendor Advisory
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