CVE-2018-9032 in DIR-850L
Summary
by MITRE
An authentication bypass vulnerability on D-Link DIR-850L Wireless AC1200 Dual Band Gigabit Cloud Router (Hardware Version : A1, B1; Firmware Version : 1.02-2.06) devices potentially allows attackers to bypass SharePort Web Access Portal by directly visiting /category_view.php or /folder_view.php.
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Analysis
by VulDB Data Team • 04/15/2025
The CVE-2018-9032 vulnerability represents a critical authentication bypass flaw affecting D-Link DIR-850L wireless routers with specific hardware and firmware versions. This vulnerability resides within the device's web management interface, specifically targeting the SharePort Web Access Portal functionality that enables users to access shared network resources. The flaw allows unauthenticated remote attackers to directly access sensitive administrative functions by navigating to specific URI endpoints without proper authentication credentials.
The technical implementation of this vulnerability stems from inadequate access control mechanisms within the router's web application. When users attempt to access the SharePort functionality, the system should validate authentication tokens and user privileges before granting access to the category_view.php and folder_view.php pages. However, the flawed implementation fails to properly enforce authentication checks for these specific endpoints, creating a direct access path to administrative resources. This represents a classic case of improper access control as classified under CWE-285, where the system fails to properly enforce authorization mechanisms for protected resources.
The operational impact of this vulnerability extends beyond simple unauthorized access to potentially exposing sensitive network configuration data, shared file systems, and administrative controls. An attacker exploiting this vulnerability could gain read and write access to shared folders, modify network settings, or potentially escalate privileges to full administrative control of the router. The vulnerability affects a specific product line with hardware versions A1 and B1 and firmware versions 1.02 through 2.06, making it particularly concerning for organizations with widespread deployment of these devices. The attack vector is remote and requires no prior authentication, making it easily exploitable through internet-based scanning campaigns.
Security professionals should consider this vulnerability in the context of the MITRE ATT&CK framework, particularly under the T1078 technique for Valid Accounts, where attackers can leverage legitimate access paths to gain unauthorized access. The vulnerability also relates to T1190 for Exploit Public-Facing Application, as it affects a publicly accessible web interface component. Organizations should implement immediate mitigations including firmware updates from D-Link, network segmentation to isolate affected devices, and monitoring for unauthorized access attempts to the specific vulnerable endpoints. The vulnerability highlights the importance of proper input validation and access control implementation in embedded web applications, aligning with security best practices outlined in NIST SP 800-53 and ISO/IEC 27001 standards for secure system development and operation.