CVE-2025-27574 in HGW-BL1500HM
Summary
by MITRE • 03/28/2025
Cross-site scripting vulnerability exists in the USB storage file-sharing function of HGW-BL1500HM Ver 002.002.003 and earlier. If this vulnerability is exploited, an arbitrary script may be executed on the web browser of the user who is using the configuration page or functions accessible only from the LAN side of the product.
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Analysis
by VulDB Data Team • 03/28/2025
This cross-site scripting vulnerability in the HGW-BL1500HM router firmware represents a critical security flaw that allows remote code execution through web browser manipulation. The vulnerability specifically affects versions 002.002.003 and earlier of the device firmware, where the USB storage file-sharing functionality fails to properly sanitize user input. When a malicious actor crafts specially formatted data for the file-sharing function, the system does not adequately validate or escape this input before rendering it in the web interface. This oversight creates a condition where an attacker can inject malicious scripts that execute within the context of the victim's browser session, effectively compromising the user's web browser and potentially the entire network.
The technical implementation of this vulnerability stems from inadequate input validation and output encoding practices within the router's web interface. The USB storage file-sharing function likely accepts user-supplied filenames, directory paths, or other metadata without proper sanitization, allowing attackers to inject script tags or malicious payloads. The vulnerability is particularly dangerous because it operates on the LAN-side configuration page, meaning that an attacker who gains access to the local network can exploit this flaw without requiring external network access. This type of vulnerability falls under CWE-79 which specifically addresses Cross-Site Scripting flaws, and it aligns with ATT&CK technique T1212 which involves exploitation of application vulnerabilities to execute code on target systems. The attack surface is further expanded by the fact that the vulnerability affects the configuration interface, which typically runs with elevated privileges and provides access to sensitive network settings.
The operational impact of this vulnerability extends beyond simple script execution, as it can enable sophisticated attack chains that compromise the entire network infrastructure. An attacker could potentially redirect users to malicious websites, steal session cookies, or even install persistent backdoors through the compromised browser. The router's configuration page access provides attackers with direct control over network settings, firewall rules, and potentially sensitive credentials stored within the device. Network administrators who access the configuration interface from within the LAN are particularly vulnerable since the attack requires no external network exposure. This vulnerability could facilitate advanced persistent threats where attackers establish long-term access to the network through compromised router interfaces, making it a significant concern for enterprise and home network security. The impact is amplified by the fact that many users may not regularly update their router firmware, leaving systems vulnerable for extended periods.
Mitigation strategies should prioritize immediate firmware updates from the vendor to address the specific XSS implementation flaws in the USB storage file-sharing function. Network administrators must implement strict input validation controls and output encoding mechanisms to prevent script injection attacks. The implementation of Content Security Policy headers and proper sanitization of all user-supplied data within web interfaces would significantly reduce the attack surface. Network segmentation and access controls should be implemented to limit access to the router configuration interface to authorized personnel only. Regular security audits of web applications and network devices should be conducted to identify similar vulnerabilities in other firmware components. Additionally, monitoring for unusual network activity and implementing intrusion detection systems can help identify exploitation attempts. Organizations should also consider implementing web application firewalls to provide additional protection against XSS attacks targeting the router's web interface. The vulnerability demonstrates the critical importance of secure coding practices in network infrastructure devices and the need for comprehensive security testing of all web-based administrative interfaces.