CVE-2015-2690 in Addons Module
Summary
by MITRE
Multiple cross-site scripting (XSS) vulnerabilities in views/add-license-form.php in the Digium Addons module (digiumaddoninstaller) before 2.11.0.7 for FreePBX allow remote attackers to inject arbitrary web script or HTML via the (1) add_license_key, (2) add_license_first_name, (3) add_license_last_name, (4) add_license_company, (5) add_license_address1, (6) add_license_address2, (7) add_license_city, (8) add_license_state, (9) add_license_post_code, (10) add_license_country, (11) add_license_phone, or (12) add_license_email parameter in an add-license-form page to admin/config.php.
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Analysis
by VulDB Data Team • 12/14/2022
The vulnerability described in CVE-2015-2690 represents a critical cross-site scripting flaw within the Digium Addons module of FreePBX systems. This vulnerability exists in the views/add-license-form.php component of the digiumaddoninstaller module, affecting versions prior to 2.11.0.7. The flaw allows remote attackers to execute malicious scripts in the context of the affected system's web application, potentially compromising user sessions and enabling unauthorized access to sensitive system information.
The technical implementation of this vulnerability stems from insufficient input validation and output sanitization within the license form processing functionality. Attackers can exploit this weakness by injecting malicious payloads through twelve distinct parameters within the add-license-form page. These parameters include add_license_key, add_license_first_name, add_license_last_name, add_license_company, add_license_address1, add_license_address2, add_license_city, add_license_state, add_license_post_code, add_license_country, add_license_phone, and add_license_email. The vulnerability manifests when user-supplied data is directly incorporated into the web page response without proper sanitization or encoding, creating an XSS vector that can be leveraged by malicious actors.
The operational impact of this vulnerability is significant within telephony and communication systems that rely on FreePBX for configuration management. Attackers could potentially steal administrator credentials, execute arbitrary commands, or manipulate system configurations to disrupt services or establish persistent access points. The vulnerability specifically targets the administrative interface at admin/config.php, making it particularly dangerous as it provides access to critical system configuration options. This type of vulnerability aligns with CWE-79 - Improper Neutralization of Input During Web Page Generation, which categorizes issues related to web application input sanitization failures. The attack vector follows the standard XSS exploitation patterns outlined in the ATT&CK framework under T1059.001 - Command and Scripting Interpreter: PowerShell, where malicious scripts can be executed through web-based interfaces.
The exploitation of this vulnerability requires minimal technical skill and can be accomplished through simple HTTP request manipulation. Remote attackers can craft malicious payloads that persist in the web application's response, enabling them to perform actions such as session hijacking, data exfiltration, or privilege escalation. The vulnerability affects not only individual user sessions but also potentially the entire FreePBX system, as administrative access provides broad control over telephony configurations. Organizations using affected versions of FreePBX should immediately implement mitigation strategies including input validation, output encoding, and application-level security controls to prevent exploitation of this cross-site scripting vulnerability.