CVE-2017-14414 in DIR-850L
Summary
by MITRE
D-Link DIR-850L REV. A (with firmware through FW114WWb07_h2ab_beta1) devices have XSS in the action parameter to htdocs/web/shareport.php.
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Analysis
by VulDB Data Team • 11/15/2019
The vulnerability identified as CVE-2017-14414 affects D-Link DIR-850L REV. A wireless routers running firmware versions through FW114WWb07_h2ab_beta1. This issue represents a cross-site scripting vulnerability that resides within the web interface of the affected device, specifically in the shareport.php script located at the htdocs/web directory. The vulnerability manifests when the action parameter is manipulated within the web application's request handling mechanism, creating a potential attack vector that could be exploited by malicious actors to inject malicious scripts into the device's web interface.
The technical flaw stems from insufficient input validation and output sanitization within the web application's parameter handling. When the action parameter is processed by the shareport.php script, the application fails to properly validate or sanitize user-supplied input before incorporating it into dynamic web content. This lack of proper input sanitization creates an environment where attacker-controlled data can be executed within the context of a user's browser session, effectively bypassing the device's security boundaries. The vulnerability falls under the CWE-79 category of Cross-Site Scripting, specifically representing a reflected XSS attack where malicious scripts are reflected off the web server to the victim's browser.
The operational impact of this vulnerability is significant as it allows remote attackers to execute arbitrary scripts in the context of the victim's browser session. An attacker could potentially steal session cookies, perform unauthorized actions on behalf of the user, or redirect users to malicious websites. The vulnerability affects the administrative web interface of the router, meaning that successful exploitation could lead to complete compromise of the device's configuration and potentially provide a foothold for further network infiltration. Given that the affected devices are consumer-grade routers, they are often deployed in home or small office environments where network security awareness may be limited, amplifying the potential impact of such an attack.
Mitigation strategies for this vulnerability should include immediate firmware updates from D-Link to address the XSS flaw in the web interface. Network administrators should ensure that all affected devices are updated to the latest firmware versions that contain proper input validation and output sanitization measures. Additionally, implementing network segmentation and access controls can help limit the potential impact of exploitation. The vulnerability demonstrates the importance of proper input validation and output encoding practices in web applications, aligning with ATT&CK technique T1212 for exploitation of web application vulnerabilities. Organizations should also consider implementing web application firewalls and monitoring for suspicious web requests that may indicate exploitation attempts. Regular security assessments and vulnerability scanning of network infrastructure should be conducted to identify and remediate similar issues in other network devices that may be susceptible to similar cross-site scripting vulnerabilities.