Description
The Versa Director SD-WAN orchestration platform which makes use of Cisco NCS application service. Active and Standby Directors communicate over TCP ports 4566 and 4570 to exchange High Availability (HA) information using a shared password. Affected versions of Versa Director bound to these ports on all interfaces. An attacker that can access the Versa Director could access the NCS service on port 4566 and exploit it to perform unauthorized administrative actions and perform remote code execution. Customers are recommended to follow the hardening guide. Versa Networks is not aware of any reported instance where this vulnerability was exploited. Proof of concept for this vulnerability has been disclosed by third party security researchers.
EPSS Score:
0%
Comprehensive Technical Analysis of EUVD-2024-54691
1. Vulnerability Assessment and Severity Evaluation
The vulnerability described in EUVD-2024-54691 affects the Versa Director SD-WAN orchestration platform, specifically its High Availability (HA) communication mechanism. The vulnerability allows an attacker to perform unauthorized administrative actions and execute remote code by exploiting the communication over TCP ports 4566 and 4570.
Severity Evaluation:
- CVSS Base Score: 9.8
- CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
The high CVSS score indicates a critical vulnerability due to the following factors:
- Attack Vector (AV:N): Network-based attack, meaning it can be exploited remotely.
- Attack Complexity (AC:L): Low complexity, indicating that the attack does not require specialized conditions.
- Privileges Required (PR:N): No privileges are required to exploit the vulnerability.
- User Interaction (UI:N): No user interaction is needed.
- Scope (S:U): Unchanged, meaning the vulnerability affects the same security scope.
- Confidentiality (C:H), Integrity (I:H), and Availability (A:H): High impact on all three CIA triad components.
2. Potential Attack Vectors and Exploitation Methods
Attack Vectors:
- Remote Access: An attacker with network access to the Versa Director can exploit the vulnerability.
- Shared Password: The use of a shared password for HA communication increases the risk of unauthorized access.
Exploitation Methods:
- Network Scanning: Attackers can scan for open TCP ports 4566 and 4570.
- Password Guessing: Brute-forcing or guessing the shared password.
- Remote Code Execution: Once access is gained, the attacker can execute arbitrary code on the Versa Director.
3. Affected Systems and Software Versions
The vulnerability affects the following versions of Versa Director:
- 22.1.3
- 21.2.3
- 22.1.1
- 22.1.2
- 22.1.4
- 21.2.2
4. Recommended Mitigation Strategies
Immediate Actions:
- Network Segmentation: Isolate the Versa Director from untrusted networks.
- Firewall Rules: Implement strict firewall rules to restrict access to TCP ports 4566 and 4570.
- Password Management: Use strong, unique passwords for HA communication and consider implementing multi-factor authentication (MFA).
Long-Term Actions:
- Patch Management: Apply the latest patches and updates from Versa Networks.
- Hardening Guide: Follow the hardening guide provided by Versa Networks to secure the platform.
- Regular Audits: Conduct regular security audits and vulnerability assessments.
5. Impact on European Cybersecurity Landscape
The vulnerability poses a significant risk to organizations using the Versa Director SD-WAN platform, particularly those in critical infrastructure sectors such as telecommunications, finance, and healthcare. The potential for remote code execution and unauthorized administrative actions can lead to data breaches, service disruptions, and financial losses.
Regulatory Compliance:
- Organizations must ensure compliance with GDPR and other relevant regulations to protect sensitive data.
- Reporting and disclosure requirements under the NIS Directive may apply.
6. Technical Details for Security Professionals
Detection:
- Network Monitoring: Monitor for unusual traffic on TCP ports 4566 and 4570.
- Log Analysis: Review logs for unauthorized access attempts and administrative actions.
Response:
- Incident Response Plan: Develop and implement an incident response plan specific to this vulnerability.
- Forensic Analysis: Conduct forensic analysis to identify the extent of the compromise and gather evidence.
Prevention:
- Access Controls: Implement robust access controls and authentication mechanisms.
- Intrusion Detection Systems (IDS): Deploy IDS to detect and alert on suspicious activities.
References:
- Versa Networks Security Portal
- Versa Director HA Port Exploit Discovery and Remediation
- Versa Director Hardening Guide
By addressing this vulnerability promptly and comprehensively, organizations can mitigate the risk of unauthorized access and remote code execution, thereby enhancing their overall cybersecurity posture.