CVE-2023-27581 Explained : Impact and Mitigation

This CVE involves a vulnerability in the

github-slug-action

GitHub Action, which exposes the slug value of GitHub environment variables within a GitHub workflow. The vulnerability exists in versions greater than or equal to 4.0.0 and less than 4.4.1, allowing for arbitrary code execution due to improper neutralization of special elements used in a command (Command Injection).

Understanding CVE-2023-27581

This section provides insights into the nature and impact of CVE-2023-27581.

What is CVE-2023-27581?

The vulnerability in the

github-slug-action

GitHub Action stems from the insecure usage of the

github.head_ref

parameter in versions 4.0.0 to 4.4.1. This flaw enables any GitHub user to execute code on GitHub runners and access secrets used in CI pipelines by creating a pull request with a malicious branch name.

The Impact of CVE-2023-27581

The impact of this vulnerability is rated as high, with confidentiality, integrity, and availability being significantly compromised. An attacker exploiting this vulnerability can run arbitrary code on GitHub runners, potentially leading to data exfiltration and unauthorized access to sensitive information.

Technical Details of CVE-2023-27581

Delving into the specifics of the vulnerability in the

github-slug-action

GitHub Action.

Vulnerability Description

The vulnerability lies in the improper handling of user input within the

github.head_ref

parameter, allowing for command injection and subsequent code execution on GitHub runners.

Affected Systems and Versions

The

github-slug-action

versions greater than or equal to 4.0.0 and less than 4.4.1 are affected by this vulnerability.

Exploitation Mechanism

Attackers can exploit this vulnerability by creating a malicious branch name in a pull request, which, when processed by the vulnerable

github-slug-action

, triggers the execution of arbitrary code.

Mitigation and Prevention

Understanding the steps to mitigate and prevent the exploitation of CVE-2023-27581.

Immediate Steps to Take

Users are advised to update the

github-slug-action

to the patched version 4.4.1 to mitigate the vulnerability and secure their GitHub workflows.

Long-Term Security Practices

Implementing secure coding practices and regularly updating dependencies can help prevent similar vulnerabilities in GitHub Actions.

Patching and Updates

Ensure timely installation of security patches and updates for all GitHub Actions to address newly discovered vulnerabilities and enhance overall security posture.