CVE-2018-12705 in DG-BR4000NG
Summary
by MITRE
DIGISOL DG-BR4000NG devices have XSS via the SSID (it is validated only on the client side).
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Analysis
by VulDB Data Team • 08/27/2024
The DIGISOL DG-BR4000NG is a wireless router device that implements client-side validation for the SSID parameter, creating a critical cross-site scripting vulnerability that allows attackers to inject malicious scripts into the device's web interface. This vulnerability stems from the device's failure to properly validate user input on the server-side, relying solely on client-side checks that can be easily bypassed by attackers who manipulate the browser's request parameters directly. The flaw occurs within the wireless configuration interface where users can set or modify the SSID parameter, which is then processed by the device without proper sanitization or validation. According to CWE-79, this represents a classic cross-site scripting vulnerability where untrusted data is directly incorporated into web page content without proper encoding or validation. The device's web interface accepts the SSID parameter through HTTP POST requests and renders it in the HTML response without appropriate output encoding, making it susceptible to script injection attacks.
The operational impact of this vulnerability is significant as it allows remote attackers to execute arbitrary JavaScript code within the context of the device's web interface, potentially enabling session hijacking, credential theft, or further exploitation of the device's administrative functions. An attacker could craft a malicious SSID value containing script tags that would execute when the device's configuration page is loaded, potentially stealing administrative credentials or redirecting users to malicious sites. This vulnerability affects the device's authentication and authorization mechanisms by allowing unauthenticated attackers to manipulate the device's configuration through the web interface, potentially leading to complete device compromise. The attack vector is particularly concerning because it requires no authentication and can be executed through simple web browser manipulation, making it accessible to attackers with basic technical knowledge. The vulnerability aligns with ATT&CK technique T1213 which covers data from information repositories, and T1078 which covers valid accounts, as successful exploitation could lead to unauthorized access to device management functions.
Mitigation strategies for this vulnerability should focus on implementing proper server-side input validation and output encoding for all user-supplied parameters including SSID values. The device firmware should be updated to validate SSID inputs on the server-side using strict whitelisting or sanitization techniques to prevent malicious script injection. Network administrators should implement network segmentation and access controls to limit exposure to the device's web interface, while also monitoring for unusual SSID configurations that might indicate exploitation attempts. Regular firmware updates and security patches should be deployed to address the vulnerability, and device administrators should be educated about the risks of accepting untrusted input in web applications. The vulnerability also highlights the importance of following secure coding practices as outlined in OWASP Top 10 and the CWE guidelines, specifically addressing the need for proper input validation and output encoding in web applications. Organizations should also consider implementing intrusion detection systems that can identify suspicious patterns in network traffic related to device configuration changes or attempts to exploit known vulnerabilities in network infrastructure devices.