CVE-2018-10106 in DIR-815
Summary
by MITRE
D-Link DIR-815 REV. B (with firmware through DIR-815_REVB_FIRMWARE_PATCH_2.07.B01) devices have permission bypass and information disclosure in /htdocs/web/getcfg.php, as demonstrated by a /getcfg.php?a=%0a_POST_SERVICES%3DDEVICE.ACCOUNT%0aAUTHORIZED_GROUP%3D1 request.
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Analysis
by VulDB Data Team • 05/29/2020
The CVE-2018-10106 vulnerability affects D-Link DIR-815 REV. B routers running firmware versions up to DIR-815_REVB_FIRMWARE_PATCH_2.07.B01, representing a critical security flaw in the device's web interface configuration handling. This vulnerability manifests as a permission bypass and information disclosure issue within the /htdocs/web/getcfg.php endpoint, which is part of the router's web management interface. The flaw allows unauthenticated attackers to retrieve sensitive configuration data and user account information by crafting specific HTTP requests that exploit improper access controls and input validation mechanisms.
The technical implementation of this vulnerability involves a crafted request parameter that manipulates the getcfg.php script to bypass normal authentication requirements. When an attacker sends a specially formatted request containing the payload %0a_POST_SERVICES%3DDEVICE.ACCOUNT%0aAUTHORIZED_GROUP%3D1, the system processes this input without proper validation or authorization checks. The %0a characters represent URL-encoded newline sequences that alter the request structure, allowing the attacker to inject commands that should normally be restricted to authenticated administrators. This type of vulnerability falls under CWE-285, which addresses improper authorization issues in web applications, and aligns with ATT&CK technique T1212 for Exploitation for Credential Access.
The operational impact of this vulnerability is severe as it provides attackers with unauthorized access to sensitive router configuration data including administrative credentials, user account information, and potentially network configuration parameters. The information disclosure aspect means that attackers can extract details about the device's services, user groups, and account settings without needing valid credentials or authentication. This exposure creates a significant risk for network security as it allows attackers to gain insights into the router's configuration and potentially escalate their privileges within the network. The vulnerability essentially undermines the router's fundamental security model by allowing unauthorized access to administrative functions through a simple web request manipulation.
Mitigation strategies for this vulnerability include immediate firmware updates from D-Link to patch the affected devices, which should address the improper access control mechanisms and input validation flaws. Network administrators should also implement additional security measures such as restricting access to the router's web interface from untrusted networks, disabling unnecessary services, and implementing network segmentation to limit the potential impact of such an exploit. The vulnerability demonstrates the importance of proper input validation and access control implementation in web applications, particularly in network infrastructure devices where unauthorized access can have far-reaching consequences. Organizations should also consider implementing intrusion detection systems to monitor for suspicious requests targeting web management interfaces, as the exploitation pattern is relatively straightforward and detectable through network traffic analysis.