CVE-2017-16564 in HT802
Summary
by MITRE
Stored Cross-site scripting (XSS) vulnerability in /cgi-bin/config2 on Vonage (Grandstream) HT802 devices allows remote authenticated users to inject arbitrary web script or HTML via the DHCP vendor class ID field (P148).
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Analysis
by VulDB Data Team • 12/04/2019
The CVE-2017-16564 vulnerability represents a critical stored cross-site scripting flaw discovered in Vonage Grandstream HT802 devices, specifically within the /cgi-bin/config2 web interface component. This vulnerability exists in the device's handling of the DHCP vendor class ID field, which is designated as P148 in the configuration parameters. The flaw enables remote authenticated attackers to inject malicious web scripts or HTML code that gets stored on the device and subsequently executed when other users access the affected configuration interface. This type of vulnerability falls under CWE-79 which specifically addresses cross-site scripting vulnerabilities, making it a significant concern for network security and device management.
The technical implementation of this vulnerability stems from inadequate input validation and output encoding within the web application layer of the Grandstream HT802 device. When an authenticated user submits a DHCP vendor class ID value through the configuration interface, the device fails to properly sanitize or escape special characters in the input before storing it in its configuration database. This stored data is then later rendered in the web interface without proper context-specific escaping, creating an environment where malicious JavaScript code can be executed in the context of other authenticated users who view the affected configuration page. The vulnerability requires authentication to exploit, but once accessed, it can affect any user who views the compromised configuration interface.
The operational impact of this vulnerability extends beyond simple script injection, as it can enable attackers to perform various malicious activities including session hijacking, data theft, and privilege escalation within the device's management interface. An attacker who gains access to the device configuration can potentially steal administrator credentials, modify device settings, or redirect traffic to malicious endpoints. The vulnerability affects the broader VoIP ecosystem as Grandstream devices are commonly deployed in enterprise and residential voice communication networks, making them attractive targets for attackers seeking to compromise network infrastructure. This issue aligns with ATT&CK technique T1059.007 for Command and Scripting Interpreter: JavaScript, and T1566 for Phishing, as it enables the delivery of malicious payloads through web-based interfaces.
Mitigation strategies for CVE-2017-16564 should prioritize immediate firmware updates from Grandstream to address the root cause of the vulnerability. Network administrators should implement strict access controls and monitor authentication logs for suspicious activities that might indicate exploitation attempts. The use of network segmentation and firewall rules can help limit access to the device's web interface to only trusted administrative networks. Additionally, implementing web application firewalls and content security policies can provide additional layers of protection against XSS attacks. Organizations should also conduct regular security assessments of their VoIP infrastructure and maintain up-to-date vulnerability management processes to prevent similar issues from arising in other networked devices. The vulnerability demonstrates the importance of proper input validation and output encoding in web applications, as specified in OWASP Top 10 and NIST guidelines for secure coding practices.