CVE-2017-8417 in DCS-1100
Summary
by MITRE
An issue was discovered on D-Link DCS-1100 and DCS-1130 devices. The device requires that a user logging into the device provide a username and password. However, the device allows D-Link apps on the mobile devices and desktop to communicate with the device without any authentication. As a part of that communication, the device uses custom version of base64 encoding to pass data back and forth between the apps and the device. However, the same form of communication can be initiated by any process including an attacker process on the mobile phone or the desktop and this allows a third party to retrieve the device's password without any authentication by sending just 1 UDP packet with custom base64 encoding. The severity of this attack is enlarged by the fact that there more than 100,000 D-Link devices out there.
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Analysis
by VulDB Data Team • 10/15/2023
The vulnerability CVE-2017-8417 represents a critical authentication bypass flaw affecting D-Link DCS-1100 and DCS-1130 network cameras, demonstrating a fundamental flaw in the device's security architecture. This weakness stems from the improper implementation of authentication mechanisms within the device's communication protocols, where legitimate applications can establish unauthenticated connections through custom base64 encoding mechanisms. The vulnerability exists because the device's design allows for communication channels that bypass standard authentication requirements, creating an attack surface that extends beyond the intended user base. This flaw particularly affects devices that are widely deployed in both residential and commercial environments, with over 100,000 units potentially exposed to this vulnerability. The issue is classified under CWE-287 which addresses improper authentication, specifically focusing on authentication bypass through weak or missing authentication mechanisms.
The technical exploitation of this vulnerability occurs through a sophisticated attack vector that leverages the device's custom base64 encoding implementation to establish unauthorized communication channels. Attackers can initiate the communication process by sending a single UDP packet containing specially crafted base64 encoded data, which triggers the device to respond with authentication credentials without requiring proper authentication. This method of exploitation is particularly dangerous because it requires minimal resources and can be executed by any process on the attacker's device, whether mobile or desktop, without the need for complex multi-step attacks. The attack exploits a design flaw where the device fails to validate the authenticity of the communication source, allowing any process to mimic legitimate application behavior and extract sensitive information. The custom base64 encoding implementation serves as both the attack vector and the mechanism for credential extraction, making the vulnerability particularly stealthy and difficult to detect through conventional network monitoring.
The operational impact of CVE-2017-8417 extends far beyond individual device compromise, creating widespread security implications across numerous networked environments. With more than 100,000 potentially affected devices deployed globally, the vulnerability creates a significant risk for unauthorized access to surveillance systems, allowing attackers to gain complete control over camera functionality and access to recorded footage. The implications include unauthorized surveillance, potential data exfiltration, and the ability to manipulate camera settings without detection. This vulnerability directly relates to ATT&CK technique T1071.004 which covers application layer protocol: DNS, and T1078 which covers valid accounts, as attackers can leverage the exposed credentials to maintain persistent access to networked camera systems. The widespread deployment of these devices in both home and business environments means that the compromise of a single device can provide attackers with access to critical surveillance infrastructure.
Mitigation strategies for CVE-2017-8417 must address both immediate remediation and long-term security improvements. The most effective immediate solution involves applying firmware updates from D-Link that properly implement authentication mechanisms and eliminate the custom base64 encoding vulnerabilities. Network administrators should implement strict network segmentation to isolate affected devices from critical systems and limit the potential impact of successful exploitation. Additional protective measures include configuring firewalls to block unauthorized UDP traffic to affected devices, disabling unnecessary services, and implementing network monitoring to detect anomalous communication patterns. Security professionals should also consider implementing intrusion detection systems specifically designed to identify the custom base64 encoding patterns associated with this vulnerability. The remediation process should include comprehensive network scanning to identify all affected devices and ensure that proper authentication mechanisms are in place. Organizations should also establish incident response procedures for potential exploitation attempts and implement regular security assessments to identify similar vulnerabilities in other networked devices. This vulnerability highlights the critical importance of proper authentication implementation and the need for thorough security testing of networked devices before deployment.