EUVD-2025-10674

Comprehensive Technical Analysis of EUVD-2025-10674

1. Vulnerability Assessment and Severity Evaluation

The vulnerability described in EUVD-2025-10674 pertains to the jenkins/ssh-agent Docker images version 6.11.1 and earlier. The issue arises from the generation of SSH host keys during image creation for Debian-based images, resulting in all containers derived from the same image version sharing identical SSH host keys. This flaw allows attackers to perform man-in-the-middle (MITM) attacks by impersonating the SSH build agent.

Severity Evaluation:

• Base Score: 9.1 (CVSS:3.1)
• Vector String: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

The high base score indicates a critical vulnerability due to the potential for significant confidentiality and integrity impacts. The attack vector is network-based (AV:N), requires low complexity (AC:L), and does not necessitate privileges (PR:N) or user interaction (UI:N). The scope is unchanged (S:U), with high confidentiality (C:H) and integrity (I:H) impacts, but no availability impact (A:N).

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Man-in-the-Middle (MITM) Attacks: An attacker can intercept communications between the Jenkins controller and the SSH build agent, impersonating the latter due to the shared SSH host keys.
• SSH Key Spoofing: Attackers can use the known SSH host keys to spoof legitimate SSH build agents, gaining unauthorized access to the Jenkins environment.

Exploitation Methods:

• Network Sniffing: Attackers can sniff network traffic to capture SSH communications and insert themselves into the communication path.
• Key Reuse: By reusing the known SSH host keys, attackers can authenticate as legitimate agents, potentially executing malicious code or exfiltrating sensitive data.

3. Affected Systems and Software Versions

Affected Systems:

• Jenkins environments utilizing jenkins/ssh-agent Docker images based on Debian.

Software Versions:

• jenkins/ssh-agent Docker images version 6.11.1 and earlier.

4. Recommended Mitigation Strategies

Immediate Actions:

• Update Docker Images: Upgrade to a version of jenkins/ssh-agent Docker images that addresses this vulnerability.
• Regenerate SSH Keys: Ensure that SSH host keys are regenerated for each container instance to avoid key reuse.

Long-Term Strategies:

• Implement Strong Authentication: Use multi-factor authentication (MFA) and strong, unique SSH keys for each container.
• Network Segmentation: Segment Jenkins environments to limit the attack surface and reduce the risk of MITM attacks.
• Regular Audits: Conduct regular security audits and vulnerability assessments to identify and mitigate similar issues.

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant risk to organizations within the European Union that rely on Jenkins for continuous integration and continuous deployment (CI/CD) pipelines. The potential for unauthorized access and data exfiltration could lead to breaches of sensitive information, intellectual property theft, and disruptions in software development processes. This underscores the importance of robust cybersecurity practices and timely patch management in maintaining the integrity of CI/CD environments.

6. Technical Details for Security Professionals

Vulnerability Details:

• CVE ID: CVE-2025-32754
• Affected Component: jenkins/ssh-agent Docker images
• Root Cause: SSH host keys are generated during image creation, leading to key reuse across containers.

Detection and Monitoring:

• Log Analysis: Monitor SSH logs for unusual activity or unauthorized access attempts.
• Intrusion Detection Systems (IDS): Deploy IDS to detect and alert on potential MITM attacks or SSH key spoofing attempts.

Remediation Steps:

1. Update Docker Images: Ensure all jenkins/ssh-agent Docker images are updated to a version that addresses the vulnerability.
2. Regenerate SSH Keys: Implement a process to regenerate SSH host keys for each container instance.
3. Enhance Authentication: Use strong, unique SSH keys and consider implementing MFA for added security.
4. Network Security: Implement network segmentation and monitor for suspicious activity.

References:

• Jenkins Security Advisory
• NVD Detail for CVE-2025-32754

By addressing this vulnerability promptly and implementing robust security measures, organizations can mitigate the risk of exploitation and ensure the integrity of their Jenkins CI/CD environments.