EUVD-2025-22774

Comprehensive Technical Analysis of EUVD-2025-22774

1. Vulnerability Assessment and Severity Evaluation

The vulnerability identified in the tj-actions/branch-names GitHub Action repository, specifically in versions 8.2.1 and below, is classified as critical. The CVSS (Common Vulnerability Scoring System) base score of 9.1 indicates a high severity due to the potential for arbitrary command execution. The vulnerability arises from inconsistent input sanitization and unescaped output, which can be exploited by malicious actors using specially crafted branch names or tags.

CVSS Vector Breakdown:

• AV:N (Network Vector): The vulnerability can be exploited remotely over the network.
• AC:L (Low Complexity): The attack requires low skill or resources to exploit.
• PR:L (Low Privileges Required): The attacker needs low-level privileges to exploit the vulnerability.
• UI:N (No User Interaction): No user interaction is required for the exploit to succeed.
• S:C (Changed Scope): The vulnerability affects a different security scope.
• C:H (High Confidentiality Impact): The vulnerability can lead to a significant breach of confidentiality.
• I:L (Low Integrity Impact): The vulnerability has a low impact on data integrity.
• A:L (Low Availability Impact): The vulnerability has a low impact on system availability.

2. Potential Attack Vectors and Exploitation Methods

The primary attack vector involves crafting malicious branch names or tags that, when processed by the vulnerable GitHub Action workflow, can execute arbitrary commands. This can be achieved by:

• Injection Attacks: Embedding malicious commands within branch names or tags.
• Command Injection: Exploiting the unescaped output to inject and execute commands in downstream workflows.

3. Affected Systems and Software Versions

The vulnerability affects all versions of the tj-actions/branch-names GitHub Action repository up to and including version 8.2.1. Systems and workflows that rely on this repository for branch or tag name retrieval are at risk.

4. Recommended Mitigation Strategies

To mitigate the risk associated with this vulnerability, the following strategies are recommended:

• Upgrade to Version 9.0.0: Immediately upgrade to version 9.0.0 of the tj-actions/branch-names repository, which includes the fix for this vulnerability.
• Input Validation: Implement robust input validation and sanitization mechanisms to ensure that branch names and tags are properly sanitized before processing.
• Output Escaping: Ensure that all outputs from the GitHub Action workflow are properly escaped to prevent command injection.
• Monitoring and Logging: Enhance monitoring and logging to detect any suspicious activities or unauthorized command executions.
• Access Controls: Limit access to the GitHub repository and workflows to trusted users and systems.

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant risk to organizations and developers within the European Union that utilize GitHub Actions for CI/CD pipelines. The potential for arbitrary command execution can lead to data breaches, unauthorized access, and disruption of services. Given the interconnected nature of modern software development, the impact could be widespread, affecting multiple downstream systems and workflows.

6. Technical Details for Security Professionals

Vulnerability Details:

• Cause: Inconsistent input sanitization and unescaped output in the tj-actions/branch-names GitHub Action workflow.
• Exploit: Malicious actors can craft branch names or tags that, when processed, execute arbitrary commands.
• Fix: Version 9.0.0 addresses the issue by implementing proper input sanitization and output escaping mechanisms.

References:

• GitHub Security Advisory: GHSA-gq52-6phf-x2r6
• Commit Fix: e497ceb8ccd43fd9573cf2e375216625bc411d1f
• Release Notes: v9.0.0

Additional Recommendations:

• Regular Audits: Conduct regular security audits of CI/CD pipelines and workflows.
• Security Training: Provide security training for developers and DevOps teams to recognize and mitigate similar vulnerabilities.
• Third-Party Dependencies: Regularly review and update third-party dependencies to ensure they are secure and up-to-date.

By addressing this vulnerability promptly and implementing robust security measures, organizations can significantly reduce the risk of exploitation and maintain the integrity of their CI/CD pipelines.