EUVD-2024-3615

Comprehensive Technical Analysis of EUVD-2024-3615

1. Vulnerability Assessment and Severity Evaluation

Vulnerability Description: The vulnerability EUVD-2024-3615 affects the built-in SSH server of Gogs through version 0.13.0. It allows for argument injection in the internal/ssh/ssh.go file, which can lead to remote code execution (RCE). Authenticated attackers can exploit this vulnerability by sending a malicious --split-string env request via an SSH connection if the built-in SSH server is activated.

Severity Evaluation: The CVSS (Common Vulnerability Scoring System) base score for this vulnerability is 9.9, which is considered critical. The CVSS vector CVSS:3.1/AC:L/AV:N/A:H/C:H/I:H/PR:L/S:C/UI:N indicates the following:

• Attack Complexity (AC): Low
• Attack Vector (AV): Network
• Availability Impact (A): High
• Confidentiality Impact (C): High
• Integrity Impact (I): High
• Privileges Required (PR): Low
• Scope (S): Changed
• User Interaction (UI): None

This high severity score underscores the critical nature of the vulnerability, which can lead to significant impacts on confidentiality, integrity, and availability.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Authenticated SSH Connection: An attacker with valid credentials can establish an SSH connection to the Gogs server.
• Malicious Request: The attacker sends a specially crafted --split-string env request to exploit the argument injection vulnerability.

Exploitation Methods:

• Remote Code Execution (RCE): By injecting malicious arguments, the attacker can execute arbitrary code on the server.
• Privilege Escalation: If the SSH server runs with elevated privileges, the attacker could gain higher-level access to the system.

3. Affected Systems and Software Versions

Affected Software:

• Gogs versions through 0.13.0

Unaffected Systems:

• Windows installations of Gogs

Note: Only systems with the built-in SSH server activated are vulnerable.

4. Recommended Mitigation Strategies

Immediate Mitigation:

• Disable Built-in SSH Server: If not required, disable the built-in SSH server to eliminate the attack vector.
• Access Control: Restrict SSH access to trusted IP addresses and enforce strong authentication mechanisms.

Long-term Mitigation:

• Update Software: Upgrade to a patched version of Gogs that addresses this vulnerability.
• Regular Audits: Conduct regular security audits and vulnerability assessments to identify and mitigate similar issues.
• Network Segmentation: Implement network segmentation to limit the potential impact of a successful exploit.

5. Impact on European Cybersecurity Landscape

Potential Impact:

• Data Breaches: Unauthorized access to sensitive data stored in Gogs repositories.
• Service Disruption: Potential disruption of services relying on Gogs, affecting development and deployment pipelines.
• Compliance Risks: Non-compliance with data protection regulations such as GDPR if sensitive data is compromised.

Broader Implications:

• Supply Chain Risks: Compromised Gogs instances could be used to inject malicious code into software supply chains.
• Reputation Damage: Organizations using vulnerable Gogs instances may face reputational damage due to security breaches.

6. Technical Details for Security Professionals

Vulnerability Details:

• File Affected: internal/ssh/ssh.go
• Vulnerability Type: Argument Injection
• Exploit Condition: Authenticated SSH connection with a malicious --split-string env request.

Detection and Monitoring:

• Log Analysis: Monitor SSH logs for unusual activity or failed login attempts.
• Intrusion Detection Systems (IDS): Implement IDS to detect and alert on suspicious SSH traffic.
• Behavioral Analysis: Use behavioral analysis tools to identify anomalous behavior indicative of an exploit attempt.

Patching and Updates:

• Patch Availability: Check the Gogs GitHub repository for the latest patches and updates.
• Deployment: Ensure that patches are tested in a staging environment before deploying to production to avoid disruptions.

References:

• Gogs Security Advisory
• SonarSource Blog
• Vicarius Blog

By following these recommendations and staying vigilant, organizations can mitigate the risks associated with EUVD-2024-3615 and enhance their overall cybersecurity posture.