CVE-2020-8090 in WLAN Box ADB
Summary
by MITRE
The Username field in the Storage Service settings of A1 WLAN Box ADB VV2220v2 devices allows stored XSS (after a successful Administrator login).
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Analysis
by VulDB Data Team • 03/27/2024
The vulnerability identified as CVE-2020-8090 represents a critical stored cross-site scripting flaw within the Storage Service settings of A1 WLAN Box ADB VV2220v2 devices. This vulnerability exists in the handling of user input within the username field of the storage service configuration interface, which operates under the assumption that administrative users have already authenticated successfully. The flaw stems from inadequate input validation and output encoding mechanisms that fail to properly sanitize user-supplied data before it is stored and subsequently rendered back to users within the web interface. This creates an environment where malicious actors can inject malicious scripts that execute in the context of other users' browsers, particularly those with administrative privileges who are logged into the device's management interface.
The technical implementation of this vulnerability involves the web application's failure to properly escape or encode special characters within the username field input. When an administrator navigates to the Storage Service settings page, the stored username value is directly embedded into the HTML response without appropriate sanitization measures. This allows attackers to craft malicious payloads that can include script tags, event handlers, or other malicious code that will execute when the page is rendered. The vulnerability is classified as a stored XSS issue because the malicious input is permanently stored on the server and executed whenever the affected page is accessed by a victim. The attack requires only a successful administrator login to exploit, making it particularly dangerous as it operates within the trusted context of the administrative interface.
The operational impact of CVE-2020-8090 extends beyond simple data theft or defacement, as it provides attackers with potential access to sensitive administrative functions and configuration data. An attacker who successfully injects malicious scripts can potentially escalate privileges, modify storage service configurations, access other administrative settings, or even extract sensitive information from the device. The vulnerability creates a persistent threat vector that remains active until the device is patched or the malicious input is manually removed from the system. The stored nature of the XSS means that any user who accesses the affected page, including legitimate administrators, becomes a potential victim of the attack, making it particularly concerning for environments where multiple administrators access the same device. This vulnerability directly maps to CWE-79, which describes cross-site scripting flaws in web applications, and aligns with ATT&CK technique T1059.007 for scripting and T1068 for exploit for privilege escalation through web application vulnerabilities.
Mitigation strategies for CVE-2020-8090 should prioritize immediate patch deployment from the vendor, as the vulnerability requires no complex prerequisites for exploitation beyond administrative access. Organizations should implement input validation measures that enforce strict character filtering and output encoding for all user-supplied data within web interfaces. The solution involves implementing proper sanitization of all input fields, particularly those that are rendered back to users in HTML contexts. Network segmentation and monitoring of administrative access logs can provide early detection of potential exploitation attempts. Additionally, implementing content security policies and disabling unnecessary administrative functions can reduce the attack surface. The vulnerability demonstrates the critical importance of input validation and output encoding in web applications, reinforcing the need for comprehensive security testing and adherence to secure coding practices. Organizations should also consider implementing web application firewalls to detect and block malicious script injection attempts, while maintaining regular security audits of networked devices to identify similar vulnerabilities across their infrastructure.