CVE-2017-7316 in HG100R
Summary
by MITRE
An issue was discovered on Humax Digital HG100R 2.0.6 devices. There is XSS on the 404 page.
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Analysis
by VulDB Data Team • 10/22/2019
The vulnerability identified as CVE-2017-7316 affects Humax Digital HG100R 2.0.6 devices and represents a cross-site scripting flaw located within the device's 404 error page implementation. This type of vulnerability falls under the CWE-79 category, which specifically addresses cross-site scripting weaknesses in web applications and embedded systems. The flaw manifests when the device's web interface fails to properly sanitize user input or output, allowing malicious actors to inject malicious scripts into the 404 page response.
The technical execution of this vulnerability occurs when a user navigates to a non-existent URL or resource on the device's web interface, triggering the 404 error page. If the device does not properly escape or filter user-supplied data in the error page rendering process, an attacker can craft malicious input that gets executed when other users view the error page. This creates a persistent XSS vector that can be exploited across multiple users of the device, potentially allowing attackers to steal session cookies, perform unauthorized actions, or redirect users to malicious sites.
The operational impact of this vulnerability extends beyond simple script execution, as it represents a fundamental security failure in the device's web interface design. The HG100R router serves as a gateway device for home and small office networks, making it a prime target for attackers seeking to establish persistent access to network infrastructure. The vulnerability can be exploited through various attack vectors including social engineering, where attackers craft malicious URLs that when visited trigger the XSS payload. This aligns with ATT&CK technique T1566, which covers social engineering attacks targeting web applications.
From a security perspective, this vulnerability demonstrates poor input validation and output encoding practices that are common in embedded web interfaces. The device's 404 page implementation likely fails to apply proper HTML escaping or context-appropriate sanitization of user-controllable data. This vulnerability could potentially enable attackers to escalate privileges or perform unauthorized configuration changes if the device's web interface lacks proper authentication controls. The risk is amplified in environments where multiple users access the device's web interface, as the XSS payload can be triggered by any user visiting the affected page. Organizations should consider implementing network segmentation and monitoring for suspicious traffic patterns that might indicate exploitation attempts. The vulnerability also highlights the importance of proper security testing for embedded web interfaces, as many manufacturers overlook the security implications of error page handling in their products.