CVE-2019-19385 in FusionPBX
Summary
by MITRE
A cross-site scripting (XSS) vulnerability in app/dialplans/dialplans.php in FusionPBX 4.4.1 allows remote attackers to inject arbitrary web script or HTML via the app_uuid parameter.
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Analysis
by VulDB Data Team • 03/05/2024
This cross-site scripting vulnerability exists within the FusionPBX 4.4.1 telephony management platform, specifically in the dialplans.php application component. The flaw resides in how the application processes the app_uuid parameter without adequate input validation or output sanitization, creating an avenue for malicious actors to execute arbitrary web scripts in the context of authenticated users' browsers. The vulnerability represents a classic reflected XSS attack vector where attacker-controlled input flows directly into the web response without proper encoding or escaping mechanisms.
The technical implementation of this vulnerability stems from insufficient parameter validation within the dialplans.php script which accepts the app_uuid parameter from user input and incorporates it directly into the HTML response without appropriate sanitization. This allows an attacker to craft malicious payloads that, when executed, can establish persistent script execution contexts within the victim's browser session. The vulnerability is particularly concerning because it affects the dialplans functionality, which is central to telecommunications management systems where users typically possess elevated privileges and access to sensitive telephony configurations.
From an operational perspective, this vulnerability enables remote code execution capabilities through browser-based attacks, potentially allowing attackers to hijack user sessions, steal authentication tokens, or perform unauthorized actions within the FusionPBX administrative interface. The impact extends beyond simple script injection as it can facilitate more sophisticated attacks such as credential theft, session fixation, or even privilege escalation within the telephony environment. Attackers could leverage this vulnerability to gain unauthorized access to critical telephony infrastructure, potentially disrupting communications or accessing sensitive call data and configuration information.
Security professionals should implement input validation and output encoding controls as primary mitigations for this vulnerability, following established practices from the CWE database which categorizes this as a CWE-79: Improper Neutralization of Input During Web Page Generation. The ATT&CK framework would classify this vulnerability under T1059.007 for Command and Scripting Interpreter: PowerShell and potentially T1566 for Phishing, as attackers may use this vulnerability to deliver malicious payloads through crafted web requests. Organizations should also consider implementing Content Security Policy headers, regular security scanning of web applications, and mandatory input sanitization for all user-supplied parameters to prevent similar vulnerabilities from being exploited in other components of the FusionPBX platform or related systems.