EUVD-2024-16815

Comprehensive Technical Analysis of EUVD-2024-16815

1. Vulnerability Assessment and Severity Evaluation

The vulnerability identified in EUVD-2024-16815 pertains to the Gessler GmbH WEB-MASTER device, specifically its restoration account, which uses weak hard-coded credentials. This vulnerability is critical due to the potential for unauthorized access and control over the web management interface of the device.

Severity Evaluation:

• Base Score: 9.8 (Critical)
• Base Score Version: CVSS 3.1
• Base Score Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

The CVSS score of 9.8 indicates a high level of severity. The vector string breaks down as follows:

• AV:N (Attack Vector: Network) - The vulnerability is exploitable over the network.
• AC:L (Attack Complexity: Low) - The attack requires low complexity to exploit.
• PR:N (Privileges Required: None) - No privileges are required to exploit the vulnerability.
• UI:N (User Interaction: None) - No user interaction is required.
• S:U (Scope: Unchanged) - The scope of the vulnerability does not change.
• C:H (Confidentiality: High) - High impact on confidentiality.
• I:H (Integrity: High) - High impact on integrity.
• A:H (Availability: High) - High impact on availability.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Network-Based Attacks: Given the CVSS vector, the primary attack vector is network-based. An attacker could exploit this vulnerability remotely over the internet or local network.
• Credential Stuffing: Attackers could use known weak credentials to gain unauthorized access.
• Brute Force Attacks: Due to the hard-coded nature of the credentials, brute force attacks could be effective.

Exploitation Methods:

• Automated Scripts: Attackers could use automated scripts to scan for devices with the WEB-MASTER software and attempt to log in using the known weak credentials.
• Man-in-the-Middle (MitM) Attacks: If the device is accessible over an unsecured network, MitM attacks could capture login attempts and replay them.
• Phishing: Although user interaction is not required, phishing could be used to lure users into revealing additional credentials or access points.

3. Affected Systems and Software Versions

Affected Systems:

• Gessler GmbH WEB-MASTER
  • Version 7.9
  • Unspecified versions (likely all versions prior to a patch release)

Software Versions:

• The vulnerability specifically affects WEB-MASTER version 7.9. It is advisable to assume that all previous versions are also affected unless explicitly stated otherwise.

4. Recommended Mitigation Strategies

Immediate Mitigation:

• Change Default Credentials: Immediately change the default credentials for the restoration account to strong, unique passwords.
• Network Segmentation: Isolate the WEB-MASTER devices from public networks and restrict access to trusted IP addresses.
• Firewall Rules: Implement strict firewall rules to limit access to the web management interface.
• Monitoring: Enable logging and monitoring for unauthorized access attempts.

Long-Term Mitigation:

• Patch Management: Apply vendor-provided patches as soon as they are available.
• Regular Audits: Conduct regular security audits to identify and mitigate similar vulnerabilities.
• User Training: Educate users on the importance of strong passwords and the risks associated with default credentials.

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant risk to organizations using Gessler GmbH WEB-MASTER devices, particularly those in critical infrastructure sectors. Unauthorized access to these devices could lead to data breaches, service disruptions, and potential loss of control over critical systems. This underscores the need for robust cybersecurity measures and continuous monitoring within the European cybersecurity landscape.

6. Technical Details for Security Professionals

Technical Insights:

• Hard-Coded Credentials: The use of hard-coded credentials is a common but highly risky practice. Security professionals should advocate for the removal of such practices in future software releases.
• Detection Methods: Implement Intrusion Detection Systems (IDS) and Intrusion Prevention Systems (IPS) to detect and prevent unauthorized access attempts.
• Log Analysis: Regularly analyze logs for suspicious activities, such as multiple failed login attempts or unusual network traffic patterns.
• Vulnerability Scanning: Use vulnerability scanning tools to identify devices with default or weak credentials.

References:

• CISA Advisory: CISA ICS Advisory
• ENISA IDs:
  • Product ID: 45d63eeb-ba21-3192-873a-5b3990918dc9
  • Vendor ID: 01a495f1-eb1a-3c4b-a138-a1ce4ed8f7f3

Conclusion: The vulnerability in Gessler GmbH WEB-MASTER devices is critical and requires immediate attention. Organizations should prioritize changing default credentials, implementing strict access controls, and applying patches as soon as they are available. Continuous monitoring and regular security audits are essential to mitigate similar risks in the future.