Sangoma FreePBX Remote Administrator Authentication Bypass Vulnerability (CVE-2019-19006) Security Advisory
Executive & SecOps Summary
SECOPS ASSESSMENTSangoma FreePBX versions 15.0.16.26 and below, 14.0.13.11 and below, and 13.0.197.13 and below
Remote attackers can bypass authentication entirely to gain full administrative access, leading to complete system compromise and unauthorized call routing
Immediately upgrade the FreePBX framework module to the patched version using the fwconsole utility
Affected Products & Version Scope
Remediation & Live Workaround Commands
PATCH & WORKAROUND1. Official Patch & Version Upgrade Commands
Use the FreePBX CLI utility 'fwconsole' to upgrade the framework module to the latest secure version.
# Upgrade the FreePBX framework module and reload the configuration
fwconsole ma upgrade framework
fwconsole reload2. Temporary Workaround & Hardening Configuration
If immediate patching is not possible, restrict access to the FreePBX admin interface using firewall rules to allow only trusted IP addresses.
# Allow access to HTTPS only from a trusted management IP (e.g., 192.168.1.100)
iptables -A INPUT -p tcp -s 192.168.1.100 --dport 443 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP3. Log Audit & IoC Verification Commands
Verify the currently installed framework version and inspect web server logs for suspicious access patterns.
# Check the active version of the framework module
fwconsole ma list | grep framework
# Scan Apache access logs for anomalous requests targeting the admin panel
grep -E '(/admin/config.php|/index.php)' /var/log/httpd/access_log | grep -i 'status'Block Exploits Instantly with Managed Virtual Patching Rules
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Technical Root Cause & Exploitation Mechanics
1. Vulnerability Overview & Root Cause
This vulnerability (CVE-2019-19006) is a critical authentication bypass flaw in the Sangoma FreePBX framework module. It stems from incorrect access control (CWE-287) within the session handling and user validation logic, allowing unauthenticated remote attackers to establish unauthorized administrative sessions.
2. Exploitation Mechanics & Attack Scenario
An attacker can exploit this vulnerability by sending specially crafted HTTP requests to the FreePBX web interface. Due to flawed validation logic, the application fails to verify the authenticity of the request, allowing the attacker to manipulate session variables and gain administrative privileges without providing valid credentials.
3. Infrastructure & Business Impact
With a CVSS score of 9.8 and inclusion in the CISA KEV catalog, this vulnerability poses an extreme risk. Successful exploitation allows attackers to hijack the PBX system, leading to toll fraud, eavesdropping on sensitive communications, and potential remote code execution on the underlying server.
Official Vendor Advisories & References
Sangoma FreePBX 115.0.16.26 and below, 14.0.13.11 and below, 13.0.197.13 and below have Incorrect Access Control.
Frequently Asked SecOps Questions (CVE-2019-19006)
FAQQ1. How critical is CVE-2019-19006 and is it actively exploited in the wild?
CVE-2019-19006 is rated CVSS 9.8 (CRITICAL) with a 30-day EPSS exploitation probability of 54.7%. It is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, requiring immediate emergency remediation.
Q2. Which vendors and products are affected by CVE-2019-19006?
Primary impacted vendors include sangoma across freepbx. Scope summary: Sangoma FreePBX 15.0.16.26 and below, 14.0.13.11 and below, and 13.0.197.13 and below
Q3. What temporary mitigations or workarounds exist for CVE-2019-19006 before patching?
[Mitigation] Immediately upgrade the FreePBX framework module to the patched version using the fwconsole utility Follow the CLI remediation commands and interactive SecOps checklist on this page to restrict exposure prior to your maintenance window.
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