CVE-2016-5671 in DM-TXRX-100-STR
Summary
by MITRE
Multiple cross-site request forgery (CSRF) vulnerabilities on Crestron Electronics DM-TXRX-100-STR devices with firmware through 1.3039.00040 allow remote attackers to hijack the authentication of arbitrary users.
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Analysis
by VulDB Data Team • 11/02/2024
The CVE-2016-5671 vulnerability represents a critical cross-site request forgery flaw affecting Crestron Electronics DM-TXRX-100-STR video transmission devices running firmware versions up to 1.3039.00040. This vulnerability resides within the web-based management interface of these network-connected devices, which are commonly deployed in enterprise environments for audiovisual system control and monitoring. The affected devices operate with embedded web servers that handle administrative functions through HTTP requests, creating an attack surface where authentication tokens are not properly validated across different domains or origins.
The technical implementation of this CSRF vulnerability stems from the absence of proper anti-CSRF token validation mechanisms within the device's web interface. When legitimate users authenticate to the device's management portal, their session tokens are typically stored in cookies or hidden form fields. However, the DM-TXRX-100-STR devices fail to implement robust CSRF protection measures such as synchronizer tokens, origin checks, or referer validation. Attackers can exploit this weakness by crafting malicious web pages or emails that contain embedded requests to the vulnerable device, which automatically execute using the victim's authenticated session without requiring additional authentication.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it allows remote attackers to perform administrative actions on behalf of authenticated users. This includes but is not limited to modifying device configurations, changing user accounts, accessing sensitive system information, or potentially disrupting critical AV infrastructure in enterprise environments. The remote nature of the attack means that adversaries do not require physical access to the device or network proximity, making the vulnerability particularly dangerous in unsecured network environments. The attack vector leverages the trust relationship between the device and authenticated users, enabling persistent unauthorized access to critical infrastructure components.
Organizations utilizing these devices face significant security risks including potential data breaches, service disruption, and unauthorized access to controlled environments. The vulnerability aligns with CWE-352, which specifically addresses Cross-Site Request Forgery weaknesses in software applications. From an ATT&CK framework perspective, this vulnerability maps to techniques involving credential access and privilege escalation, particularly T1566 for credential harvesting and T1078 for valid accounts usage. Mitigation strategies should include immediate firmware updates to versions that implement proper CSRF protection mechanisms, network segmentation to isolate these devices from critical systems, and implementing additional authentication layers such as two-factor authentication. Security administrators should also consider deploying web application firewalls and monitoring for suspicious administrative requests to detect potential exploitation attempts. The vulnerability demonstrates the critical importance of implementing robust input validation and session management controls in embedded network devices, particularly those handling sensitive infrastructure functions.