CVE-2019-17222 in WRN 150
Summary
by MITRE
An issue was discovered on Intelbras WRN 150 1.0.17 devices. There is stored XSS in the Service Name tab of the WAN configuration screen, leading to a denial of service (inability to change the configuration).
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Analysis
by VulDB Data Team • 02/05/2024
The vulnerability identified as CVE-2019-17222 affects Intelbras WRN 150 1.0.17 wireless routers, representing a critical security flaw that combines stored cross-site scripting with denial of service capabilities. This vulnerability exists within the web-based management interface of the device, specifically targeting the Service Name tab located within the WAN configuration screen. The flaw stems from inadequate input validation and output encoding mechanisms that fail to properly sanitize user-supplied data before storing and rendering it within the web interface.
The technical implementation of this vulnerability allows an attacker to inject malicious JavaScript code through the Service Name field, which gets stored on the device's server-side database. When administrators or legitimate users access the WAN configuration screen, the malicious payload executes within their browser context, potentially leading to session hijacking, credential theft, or further exploitation. The stored nature of this XSS vulnerability means that the malicious code persists even after the initial injection, making it particularly dangerous as it affects anyone who views the compromised page. This vulnerability directly maps to CWE-79 which defines cross-site scripting as the improper handling of input data that leads to execution of arbitrary code in the user's browser.
The operational impact of CVE-2019-17222 extends beyond simple script execution, as it creates a persistent denial of service condition that prevents legitimate users from modifying critical network configuration parameters. When the malicious payload executes, it can interfere with normal page rendering and form submission processes, effectively blocking administrators from making necessary configuration changes to their network. This creates a cascading effect where the device becomes partially or completely non-functional for authorized users while remaining accessible to attackers who can leverage the stored XSS to maintain persistent access. The vulnerability also aligns with ATT&CK technique T1059.007 which covers scripting through web shells, and T1489 which addresses denial of service through service manipulation.
Mitigation strategies for this vulnerability require immediate attention from network administrators and system operators. The most effective immediate solution involves upgrading the device firmware to a version that properly sanitizes input data and implements proper output encoding for all user-supplied content. Network segmentation and access control measures should be implemented to limit exposure, while monitoring systems should be deployed to detect unusual activity patterns that might indicate exploitation attempts. Security professionals should also consider implementing web application firewalls to filter malicious payloads before they reach the vulnerable device. Regular security audits and penetration testing of network infrastructure should be conducted to identify similar vulnerabilities in other network equipment. The vulnerability underscores the importance of input validation and output encoding practices as outlined in OWASP Top Ten and NIST Cybersecurity Framework guidelines, particularly in the context of embedded network devices that often lack robust security controls.