EUVD-2024-19270

Comprehensive Technical Analysis of EUVD-2024-19270

1. Vulnerability Assessment and Severity Evaluation

The vulnerability described in EUVD-2024-19270 pertains to an expression injection flaw in the /mehah/otclient GitHub Actions workflow, specifically in the "Analysis - SonarCloud" workflow. This vulnerability allows an attacker to execute arbitrary commands remotely on the runner, leak secrets, and alter the repository. The severity of this vulnerability is rated with a CVSS Base Score of 9.8, which is considered critical. The CVSS vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H indicates the following:

• Attack Vector (AV): Network (N) - The vulnerability is exploitable over the network.
• Attack Complexity (AC): Low (L) - The attack requires minimal skill or resources.
• Privileges Required (PR): None (N) - No special privileges are required to exploit the vulnerability.
• User Interaction (UI): None (N) - No user interaction is required.
• Scope (S): Unchanged (U) - The vulnerability affects the same security scope.
• Confidentiality (C): High (H) - There is a high impact on confidentiality.
• Integrity (I): High (H) - There is a high impact on integrity.
• Availability (A): High (H) - There is a high impact on availability.

2. Potential Attack Vectors and Exploitation Methods

The primary attack vector is through the manipulation of input data in the GitHub Actions workflow. An attacker could inject malicious expressions into the workflow, leading to the execution of arbitrary commands. This could be achieved by:

• Injecting Malicious Code: An attacker could inject malicious code into the workflow configuration files or input parameters.
• Exploiting Untrusted Input: An attacker could exploit untrusted input sources within the workflow, leading to command execution.
• Leaking Secrets: An attacker could exfiltrate sensitive information such as API keys, tokens, and other secrets stored in the repository.

3. Affected Systems and Software Versions

The vulnerability affects the otclient software prior to the commit db560de0b56476c87a2f967466407939196dd254. Specifically, any version of otclient that uses the vulnerable "Analysis - SonarCloud" workflow is at risk. Users should ensure they are using a version of otclient that includes this commit or later.

4. Recommended Mitigation Strategies

To mitigate this vulnerability, the following steps are recommended:

• Update to the Latest Version: Ensure that the otclient software is updated to a version that includes the commit db560de0b56476c87a2f967466407939196dd254 or later.
• Review Workflow Configurations: Thoroughly review and sanitize all GitHub Actions workflow configurations to ensure they do not accept untrusted input.
• Implement Input Validation: Add robust input validation mechanisms to prevent the injection of malicious expressions.
• Use Secrets Management: Store sensitive information using GitHub Secrets and ensure they are not exposed in workflow logs or configurations.
• Monitor and Audit: Regularly monitor and audit GitHub Actions workflows for any suspicious activities or unauthorized changes.

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant risk to organizations and individuals using the otclient software, particularly within the European Union. The potential for remote command execution, secret leakage, and repository alteration could lead to severe data breaches, unauthorized access, and loss of integrity. This underscores the importance of maintaining robust cybersecurity practices and promptly addressing vulnerabilities in open-source software.

6. Technical Details for Security Professionals

• Vulnerability Type: Expression Injection
• Affected Component: GitHub Actions workflow "Analysis - SonarCloud"
• Fix Commit: db560de0b56476c87a2f967466407939196dd254
• References:
  • GitHub Security Advisory
  • Fix Commit
  • Workflow Configuration
  • GitHub Security Lab Research
  • GitHub Security Lab Research on Untrusted Input

Conclusion

The vulnerability described in EUVD-2024-19270 is critical and requires immediate attention. Organizations using the otclient software should prioritize updating to a secure version and implementing robust security measures to mitigate the risk of exploitation. This incident highlights the importance of continuous monitoring and prompt response to vulnerabilities in the software supply chain.