CVE-2020-27366 in HGB10R-02 BRGCAB
Summary
by MITRE • 08/28/2023
Cross Site Scripting (XSS) vulnerability in wlscanresults.html in Humax HGB10R-02 BRGCAB version 1.0.03, allows local attackers to execute arbitrary code.
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Analysis
by VulDB Data Team • 09/22/2023
The CVE-2020-27366 vulnerability represents a critical cross site scripting flaw discovered in the Humax HGB10R-02 BRGCAB version 1.0.03 router firmware. This vulnerability specifically targets the wlscanresults.html web interface component, which is responsible for displaying wireless network scan results to users. The flaw enables local attackers to inject malicious scripts into the web interface, potentially compromising the device's security posture and user data integrity. The vulnerability is particularly concerning because it affects a core administrative interface component that handles sensitive network information and configuration data.
This XSS vulnerability stems from inadequate input validation and output encoding within the wlscanresults.html page implementation. The affected firmware version 1.0.03 fails to properly sanitize user-supplied input parameters before rendering them in the web interface context. When the router processes wireless network scan results, it does not adequately escape or filter special characters that could be interpreted as HTML or JavaScript code. This allows attackers with local access to manipulate the web interface by injecting malicious payloads that execute within the context of the user's browser session. The vulnerability is classified as CWE-79 - Improper Neutralization of Input During Web Page Generation, which specifically addresses the failure to properly encode or escape user-controllable data in web applications.
The operational impact of this vulnerability extends beyond simple script execution, as it can enable attackers to perform various malicious activities within the compromised network environment. Local attackers can leverage this vulnerability to steal session cookies, redirect users to malicious websites, inject phishing content, or escalate privileges within the router's administrative interface. The vulnerability creates a persistent threat vector that allows attackers to maintain access to the network infrastructure, potentially enabling them to modify router configurations, intercept network traffic, or establish persistent backdoors. Given that this affects a wireless gateway device, the compromise could extend to all connected devices on the local network, making it particularly dangerous for home and small office environments where network security is often inadequate.
The attack surface for this vulnerability is significant as it requires minimal privileges for exploitation, typically only local network access or physical access to the device. Attackers can craft malicious payloads that execute when the router's web interface is accessed, making it difficult to detect and prevent. The vulnerability's persistence is enhanced by the fact that it affects the router's core administrative interface, which users frequently access for network management tasks. This makes the attack vector particularly effective as users may unknowingly trigger malicious code execution while performing routine network management activities. According to ATT&CK framework, this vulnerability aligns with T1059.007 - Command and Scripting Interpreter: JavaScript and T1566.001 - Phishing: Spearphishing Attachment, as it enables both code execution and social engineering attacks through malicious web content delivery.
Mitigation strategies for CVE-2020-27366 should focus on immediate firmware updates from Humax, as the vendor has likely released patches addressing this specific vulnerability. Network administrators should implement network segmentation to limit local access to critical devices and employ web application firewalls to detect and block malicious script injection attempts. Regular security audits should include verification of router firmware versions and configuration settings to ensure that all devices are running patched versions. Additional protective measures include implementing strict access controls for router administrative interfaces, enabling secure network protocols, and conducting regular penetration testing to identify similar vulnerabilities in network infrastructure components. The vulnerability underscores the importance of maintaining up-to-date firmware across all network devices and implementing robust security monitoring to detect anomalous behavior in network infrastructure components.