CVE-2017-6190 in DWR-116
Summary
by MITRE
Directory traversal vulnerability in the web interface on the D-Link DWR-116 device with firmware before V1.05b09 allows remote attackers to read arbitrary files via a .. (dot dot) in a "GET /uir/" request.
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Analysis
by VulDB Data Team • 06/21/2024
The CVE-2017-6190 vulnerability represents a critical directory traversal flaw in the web interface of D-Link DWR-116 wireless routers. This vulnerability exists within the device's firmware version prior to V1.05b09 and allows remote attackers to access arbitrary files on the device through crafted HTTP requests. The flaw specifically manifests when processing GET requests to the /uir/ endpoint, where the application fails to properly validate user input containing directory traversal sequences. Attackers can exploit this weakness by appending .. (dot dot) sequences to the request path, enabling them to navigate outside the intended directory structure and access sensitive system files that should remain restricted.
This vulnerability falls under the CWE-22 category, which classifies directory traversal attacks as a fundamental weakness in input validation. The D-Link DWR-116 device exposes its web administration interface to remote networks, making it susceptible to exploitation by attackers who can craft malicious requests without requiring authentication. The attack vector is particularly dangerous because it operates entirely through HTTP requests, requiring no specialized tools beyond standard web browsers or HTTP clients. The vulnerability enables attackers to retrieve configuration files, system logs, and potentially sensitive credentials stored within the router's file system, which could provide attackers with comprehensive insights into the device's operation and network configuration.
The operational impact of CVE-2017-6190 extends beyond simple file access, as it can facilitate more sophisticated attacks within the network. By accessing system files, attackers can potentially discover network topology information, identify other vulnerable devices, and extract authentication credentials that could enable further network infiltration. The vulnerability aligns with ATT&CK technique T1083 (File and Directory Discovery) and T1213 (Data from Information Repositories), as it allows adversaries to enumerate system resources and extract sensitive data. The remote nature of the attack means that an attacker could exploit this vulnerability from anywhere on the internet, making it particularly dangerous for devices connected to public networks or exposed to external traffic.
Mitigation strategies for CVE-2017-6190 primarily involve firmware updates from D-Link, specifically upgrading to firmware version V1.05b09 or later, which contains patches addressing the directory traversal vulnerability. Network administrators should also implement firewall rules to restrict access to the device's web interface, limiting exposure to trusted networks only. Additional protective measures include disabling unnecessary web services, implementing strong access controls, and conducting regular security assessments of network devices. The vulnerability demonstrates the importance of proper input validation and secure coding practices, particularly when handling user-supplied data in web applications. Organizations should also consider network segmentation to limit the potential impact of such vulnerabilities and establish regular firmware update policies to ensure devices remain protected against known security flaws.