CVE-2017-11563 in EyeOn Baby Monitor DCS-825L
Summary
by MITRE
D-Link EyeOn Baby Monitor (DCS-825L) 1.08.1 has a remote code execution vulnerability. A UDP "Discover" service, which provides multiple functions such as changing the passwords and getting basic information, was installed on the device. A remote attacker can send a crafted UDP request to finderd to perform stack overflow and execute arbitrary code with root privilege on the device.
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Analysis
by VulDB Data Team • 03/17/2020
The CVE-2017-11563 vulnerability affects D-Link EyeOn Baby Monitor model DCS-825L running firmware version 1.08.1, representing a critical remote code execution flaw that exposes connected devices to severe cybersecurity threats. This vulnerability resides within the device's UDP "Discover" service implementation, which operates on the network to provide various administrative functions including password modification and basic system information retrieval. The flaw manifests as a stack overflow condition that occurs when the finderd service processes malformed UDP packets, allowing unauthorized remote attackers to exploit this weakness and gain full system control with root privileges.
The technical exploitation of this vulnerability follows a classic stack buffer overflow pattern where insufficient input validation enables an attacker to overwrite stack memory regions and redirect program execution flow. The UDP Discover service acts as the attack vector, accepting crafted packets that trigger the buffer overflow condition within the finderd process. This vulnerability aligns with CWE-121, which describes stack-based buffer overflow conditions, and represents a significant security weakness in the device's network service implementation. The attack requires only network connectivity to the device's UDP port, making it particularly dangerous as it can be exploited from anywhere on the internet without requiring physical access or authentication credentials.
The operational impact of this vulnerability extends beyond simple unauthorized access, as it provides complete system compromise with root privileges. An attacker who successfully exploits this vulnerability can execute arbitrary code on the device with the highest possible system permissions, potentially enabling them to install malware, modify device configuration, access stored video feeds, or use the device as a pivot point for attacking other systems on the local network. The implications are particularly severe for a baby monitor device, as it could allow unauthorized surveillance of private spaces and compromise the privacy of families who rely on such devices for security purposes. This vulnerability also aligns with ATT&CK technique T1059, which covers command and scripting interpreter usage, as the exploitation allows for arbitrary command execution on the compromised device.
Mitigation strategies for CVE-2017-11563 should include immediate firmware updates from D-Link, which would contain patches addressing the stack overflow vulnerability in the UDP Discover service. Network segmentation and firewall rules should be implemented to restrict access to the device's UDP ports, particularly those used by the finderd service. Organizations should also consider disabling unnecessary network services on the device and implementing network monitoring to detect anomalous UDP traffic patterns that may indicate exploitation attempts. Additionally, regular security assessments of IoT devices should be conducted to identify similar vulnerabilities in other network-connected equipment, as this type of flaw is common in embedded systems where security considerations are often secondary to functionality and cost constraints. The vulnerability demonstrates the critical importance of input validation and secure coding practices in network services, particularly those that operate with elevated privileges.