CVE-2007-2350 in freePBX
Summary
by MITRE
admin/config.php in the music-on-hold module in freePBX 2.2.x allows remote authenticated administrators to execute arbitrary commands via shell metacharacters in the del parameter.
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Analysis
by VulDB Data Team • 08/11/2017
The vulnerability described in CVE-2007-2350 represents a critical command injection flaw within the music-on-hold module of freePBX version 2.2.x. This issue affects remote authenticated administrators who can leverage shell metacharacters within the del parameter of the admin/config.php endpoint to execute arbitrary commands on the underlying system. The vulnerability stems from inadequate input validation and sanitization within the module's configuration handling logic, creating an attack vector that allows malicious command execution with the privileges of the web application user.
This vulnerability falls under the CWE-77 category of Command Injection, specifically manifesting as a weakness in how the system processes user-supplied input before executing system commands. The flaw exists in the music-on-hold module's administrative interface where the del parameter is directly incorporated into shell commands without proper sanitization. Attackers can exploit this by crafting malicious input containing shell metacharacters such as semicolons, ampersands, or backticks that get interpreted by the system shell, enabling arbitrary code execution. The impact is particularly severe because the vulnerability requires only authenticated administrative access, which is often limited to authorized personnel but can be compromised through credential theft or social engineering attacks.
The operational impact of this vulnerability extends beyond simple command execution, as it provides attackers with the ability to manipulate the entire telephony system. An attacker with administrative privileges could potentially gain complete control over the PBX server, including access to voicemail systems, call routing configurations, and sensitive telephony data. The attack can be executed remotely, making it particularly dangerous for systems with exposed administrative interfaces. The vulnerability affects the integrity and confidentiality of the entire communication infrastructure, potentially enabling eavesdropping on calls, modification of call routing, or even complete system compromise. This type of vulnerability is particularly concerning in enterprise environments where PBX systems handle critical communication infrastructure and sensitive business data.
Mitigation strategies for CVE-2007-2350 should focus on immediate patching of the affected freePBX version, as the vulnerability has been addressed in subsequent releases. Organizations should implement proper input validation and sanitization techniques, ensuring that all user-supplied parameters undergo rigorous filtering before being processed by system commands. The principle of least privilege should be enforced by limiting administrative access to only necessary personnel and implementing multi-factor authentication for administrative accounts. Additionally, network segmentation should be employed to restrict access to administrative interfaces, and regular security audits should be conducted to identify similar vulnerabilities in other modules. The ATT&CK framework categorizes this vulnerability under T1059.001 for Command and Scripting Interpreter, highlighting the need for comprehensive defensive measures including network monitoring, log analysis, and intrusion detection systems to detect and prevent exploitation attempts.