CVE-2020-7351 in Trixbox Community Edition
Summary
by MITRE
An OS Command Injection vulnerability in the endpoint_devicemap.php component of Fonality Trixbox Community Edition allows an attacker to execute commands on the underlying operating system as the "asterisk" user. Note that Trixbox Community Edition has been unsupported by the vendor since 2012. This issue affects: Fonality Trixbox Community Edition, versions 1.2.0 through 2.8.0.4. Versions 1.0 and 1.1 are unaffected.
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Analysis
by VulDB Data Team • 10/15/2020
The CVE-2020-7351 vulnerability represents a critical operating system command injection flaw within the Fonality Trixbox Community Edition telephony platform, specifically within the endpoint_devicemap.php component. This vulnerability exists in a software ecosystem that has been officially unsupported since 2012, creating a particularly dangerous scenario where organizations continue to operate vulnerable systems without vendor security updates or patches. The affected versions span from 1.2.0 through 2.8.0.4, while earlier versions 1.0 and 1.1 remain unaffected, indicating that the vulnerability was introduced or exacerbated during specific development cycles of the platform. The vulnerability's impact is significant as it allows remote attackers to execute arbitrary commands on the underlying operating system with the privileges of the asterisk user account, which is the standard user context for Asterisk telephony services.
The technical nature of this vulnerability stems from improper input validation and sanitization within the endpoint_devicemap.php script, which processes user-supplied data without adequate filtering or escaping mechanisms. When attackers provide malicious input through specific parameters, the application fails to properly validate or escape this data before incorporating it into system commands. This design flaw falls under the CWE-77 category, which specifically addresses command injection vulnerabilities where untrusted data is directly executed as operating system commands. The vulnerability's exploitation pathway demonstrates how insufficient input validation creates an attack surface where attackers can inject OS commands that bypass normal application security controls and execute with elevated privileges within the system context.
The operational impact of CVE-2020-7351 extends beyond simple command execution, as the asterisk user typically possesses significant system privileges necessary for telephony operations. This user context provides access to telephony configuration files, database connections, and system resources that could enable attackers to escalate their privileges further or access sensitive information. The vulnerability's exploitation could result in complete system compromise, unauthorized access to voice communications, modification of telephony configurations, or use of the system as a pivot point for attacking other network resources. Organizations running unsupported versions of Trixbox face particular risk as they cannot receive security updates, leaving them exposed to persistent threats that could remain undetected for extended periods. The attack surface is particularly concerning given that telephony systems often serve as critical communication infrastructure for businesses and organizations.
Mitigation strategies for CVE-2020-7351 must address both immediate remediation needs and long-term security posture improvements. The most effective immediate solution involves upgrading to a supported version of the telephony platform or implementing network segmentation to isolate affected systems from critical network resources. Organizations should also consider implementing web application firewalls to detect and block malicious command injection attempts, while conducting thorough network monitoring to identify potential exploitation attempts. Given that the vendor has ceased support, organizations must evaluate their telephony infrastructure and consider migrating to modern, supported platforms that receive regular security updates and patches. Security hardening measures should include disabling unnecessary services, implementing strict input validation for all user-facing applications, and establishing robust access controls that limit the privileges of system accounts. The vulnerability also highlights the importance of maintaining current security awareness and vulnerability management practices to prevent similar issues from arising in other legacy systems that may continue to operate without proper vendor support.