EUVD-2025-19755

Comprehensive Technical Analysis of EUVD-2025-19755

1. Vulnerability Assessment and Severity Evaluation

The vulnerability EUVD-2025-19755 is an authenticated remote code execution (RCE) flaw in Lucee’s administrative interface, specifically within the scheduled task functionality. The vulnerability allows an authenticated administrator to configure a scheduled job to retrieve and execute a remote .cfm file from an attacker-controlled server. This file is then written to the Lucee webroot and executed with the privileges of the Lucee service account.

Severity Evaluation:

• Base Score: 9.4 (Critical)
• Base Score Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

The high base score indicates a critical vulnerability due to the potential for complete system compromise, including confidentiality, integrity, and availability impacts. The attack complexity is low, and the attack vector is network-based, making it a significant risk for systems exposed to the internet.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

1. Authenticated Access: An attacker must first gain administrative access to the Lucee administrative interface. This could be achieved through credential theft, brute-forcing, or exploiting other vulnerabilities.
2. Scheduled Task Configuration: Once authenticated, the attacker can configure a scheduled job to fetch a malicious .cfm file from a remote server.
3. Remote Code Execution: The malicious .cfm file is executed with the privileges of the Lucee service account, leading to arbitrary code execution.

Exploitation Methods:

• Credential Theft: Phishing attacks or social engineering to obtain administrative credentials.
• Brute-Forcing: Automated tools to guess weak or default passwords.
• Exploiting Other Vulnerabilities: Leveraging other vulnerabilities in the Lucee system or related infrastructure to gain administrative access.

3. Affected Systems and Software Versions

Affected Systems:

• All versions of Lucee with scheduled task functionality.
• Specifically, Lucee versions 5.x and 6.x.

Vendor:

• Lucee Association Switzerland

4. Recommended Mitigation Strategies

1. Patch Management:

   • Apply the latest security patches and updates provided by Lucee Association Switzerland.
   • Regularly update all software components to mitigate known vulnerabilities.

2. Access Control:

   • Implement strong authentication mechanisms, including multi-factor authentication (MFA).
   • Limit administrative access to trusted personnel only.

3. Network Segmentation:

   • Segregate administrative interfaces from public-facing networks.
   • Use firewalls and network access controls to restrict access to the Lucee administrative interface.

4. Monitoring and Logging:

   • Enable comprehensive logging and monitoring of administrative activities.
   • Implement intrusion detection and prevention systems (IDPS) to detect and respond to suspicious activities.

5. Code Integrity Checks:

   • Enforce integrity checks and path restrictions for scheduled task fetches.
   • Implement code signing and verification mechanisms for all executable files.

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant risk to organizations using Lucee, particularly those in the European Union. Given the critical nature of the vulnerability, it could lead to:

• Data Breaches: Unauthorized access to sensitive data.
• Service Disruptions: Compromise of critical services and infrastructure.
• Compliance Issues: Violations of GDPR and other regulatory requirements.

Organizations must prioritize patching and implementing robust security measures to mitigate the risk associated with this vulnerability.

6. Technical Details for Security Professionals

Technical Overview:

• Vulnerable Component: Lucee’s administrative interface, specifically the scheduled task functionality.
• Exploit Path: /lucee/admin/web.cfm
• Exploit Mechanism: Configuration of a scheduled job to fetch and execute a remote .cfm file.

References:

• Metasploit Module: Lucee Scheduled Job Exploit
• GitHub Repository: Lucee
• Vulnerability Advisory: VulnCheck Advisory

Mitigation Steps:

1. Update Lucee: Ensure all Lucee installations are updated to the latest version.
2. Restrict Access: Limit access to the administrative interface to trusted IP addresses.
3. Implement MFA: Enforce multi-factor authentication for administrative access.
4. Monitor Logs: Regularly review logs for any unauthorized access or suspicious activities.
5. Network Security: Use firewalls and IDPS to protect against unauthorized access and exploitation attempts.

By following these mitigation strategies and staying vigilant, organizations can significantly reduce the risk posed by this critical vulnerability.