EUVD-2025-21037

Comprehensive Technical Analysis of EUVD-2025-21037

1. Vulnerability Assessment and Severity Evaluation

The vulnerability described in EUVD-2025-21037 is an unauthenticated command injection flaw in VICIdial versions 2.9 RC1 through 2.13 RC1. This vulnerability arises when password encryption is enabled, a non-default configuration, and the application improperly passes the HTTP Basic Authentication password directly to a call to exec() without adequate sanitation. This allows remote attackers to inject and execute arbitrary operating system commands as the web server user.

Severity Evaluation:

• Base Score: 9.3 (Critical)
• Base Score Version: 4.0
• Base Score Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

The high base score indicates a critical vulnerability due to the ease of exploitation (low complexity, no authentication required) and the severe impact on confidentiality, integrity, and availability.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Remote Unauthenticated Access: Attackers can exploit this vulnerability without needing any authentication, making it highly accessible.
• HTTP Basic Authentication: The vulnerability is triggered when the HTTP Basic Authentication password is passed to the exec() function.

Exploitation Methods:

• Command Injection: Attackers can craft malicious HTTP requests that include specially crafted passwords designed to inject arbitrary commands.
• Automated Tools: Exploitation frameworks like Metasploit can be used to automate the attack, as indicated by the reference to a Metasploit module.

3. Affected Systems and Software Versions

Affected Software:

• VICIdial versions: 2.9 RC1 through 2.13 RC1
• Specific Component: vicidial_sales_viewer.php

Configuration:

• The vulnerability is present only when password encryption is enabled, which is a non-default configuration.

4. Recommended Mitigation Strategies

Immediate Mitigation:

• Disable Password Encryption: Revert to the default configuration where password encryption is disabled.
• Patching: Apply the latest patches provided by VICIdial Group to address this vulnerability.

Long-Term Mitigation:

• Input Sanitation: Ensure that all user inputs, including authentication credentials, are properly sanitized before being passed to system calls.
• Least Privilege: Run the web server with the least privileges necessary to minimize the impact of command injection.
• Regular Audits: Conduct regular security audits and code reviews to identify and mitigate similar vulnerabilities.

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant risk to organizations using VICIdial within the European Union. Given the critical nature of the vulnerability, it could lead to:

• Data Breaches: Unauthorized access to sensitive data.
• System Compromise: Complete takeover of affected systems.
• Compliance Issues: Potential violations of GDPR and other regulatory requirements due to unauthorized data access.

6. Technical Details for Security Professionals

Vulnerability Details:

• Component: vicidial_sales_viewer.php
• Function: exec()
• Input: HTTP Basic Authentication password
• Condition: Password encryption enabled

Exploitation Steps:

1. Craft Malicious Request: Create an HTTP request with a specially crafted password designed to inject commands.
2. Send Request: Send the request to the vulnerable component.
3. Execute Commands: The injected commands are executed by the web server user.

Detection and Monitoring:

• Log Analysis: Monitor web server logs for unusual exec() calls and suspicious HTTP requests.
• Intrusion Detection Systems (IDS): Deploy IDS to detect and alert on command injection attempts.

References:

• Metasploit Module
• VulnCheck Advisory
• Exploit Database

Conclusion: This vulnerability represents a critical risk to organizations using VICIdial. Immediate mitigation through configuration changes and patching is essential to prevent potential exploitation. Long-term strategies should focus on improving input sanitation and adhering to best security practices to avoid similar issues in the future.