CVE-2014-8508 in AVR-3313CI
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in s_network.asp in the Denon AVR-3313CI audio/video receiver allows remote attackers to inject arbitrary web script or HTML via unspecified parameters, related to Friendlyname.
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Analysis
by VulDB Data Team • 03/16/2019
The CVE-2014-8508 vulnerability represents a critical cross-site scripting flaw in the Denon AVR-3313CI audio/video receiver's web interface implementation. This device, designed for home entertainment systems, exposes a web-based management interface that suffers from improper input validation and sanitization mechanisms. The vulnerability specifically affects the s_network.asp page which handles network configuration parameters, particularly those related to the device's friendly name setting. Attackers can exploit this weakness by crafting malicious payloads that target the friendlyname parameter, thereby enabling arbitrary script execution within the context of a user's browser session.
The technical nature of this vulnerability aligns with CWE-79, which categorizes cross-site scripting as a code injection flaw occurring when untrusted data is incorporated into web pages without proper validation or encoding. The flaw exists in the device's web server implementation where user-supplied input from the Friendlyname field is directly processed and returned to the browser without adequate sanitization. This creates an environment where malicious scripts can be injected and executed when other users view the device's network configuration page, potentially leading to session hijacking, credential theft, or further exploitation of the networked device. The vulnerability's classification as a remote attack vector means that exploitation does not require physical access or local network privileges, making it particularly dangerous in networked environments.
The operational impact of this vulnerability extends beyond simple script injection, as it fundamentally compromises the security boundaries of the networked audio/video receiver. In a home network context, this vulnerability could enable attackers to execute malicious code on devices that are often considered trusted network endpoints, potentially serving as entry points for broader network infiltration. The attack surface becomes particularly concerning when considering that many users may not regularly update their networking equipment firmware, leaving these devices vulnerable for extended periods. Additionally, the vulnerability could be leveraged in combination with other network-based attacks, as the compromised device could become a pivot point for accessing other network resources or serving as a persistent backdoor.
Mitigation strategies for CVE-2014-8508 should prioritize immediate firmware updates from Denon, as the manufacturer would have likely released patches addressing the input validation issues. Network segmentation practices should be implemented to isolate networked entertainment devices from critical network segments, reducing the potential impact of exploitation. Input validation controls must be strengthened at the application level, ensuring that all user-supplied data undergoes proper sanitization and encoding before being processed or returned to web clients. Security monitoring should include detection of unusual network traffic patterns that might indicate exploitation attempts, and network administrators should consider implementing web application firewalls to filter malicious payloads targeting such vulnerabilities. The ATT&CK framework would classify this vulnerability under T1059.007 for scripting languages and T1566 for spearphishing with watering holes, as attackers could leverage the compromised device to deliver malicious content to other network users.