CVE-2019-20463 in Smart HD Wifi Security Camera EAN 2
Summary
by MITRE • 04/02/2021
An issue was discovered on Sannce Smart HD Wifi Security Camera EAN 2 950004 595317 devices. A crash and reboot can be triggered by crafted IP traffic, as demonstrated by the Nikto vulnerability scanner. For example, sending the 111111 string to UDP port 20188 causes a reboot. To deny service for a long time period, the crafted IP traffic may be sent periodically.
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Analysis
by VulDB Data Team • 07/30/2024
This vulnerability affects Sannce Smart HD Wifi Security Camera models with EAN 2 950004 595317, representing a critical denial of service flaw that can be exploited through crafted IP traffic. The device exhibits a predictable crash behavior when receiving specific input patterns, specifically the string "111111" sent to UDP port 20188, which triggers an immediate reboot cycle. This vulnerability demonstrates a fundamental lack of input validation and error handling within the camera's network processing stack, creating a persistent availability threat that can be easily exploited by remote attackers.
The technical implementation of this vulnerability stems from insufficient bounds checking and malformed input handling in the camera's UDP service implementation. When the device receives the crafted payload containing the string "111111" on UDP port 20188, it fails to properly validate the incoming data structure, leading to a buffer overflow condition or stack corruption that results in system instability and subsequent reboot. This behavior aligns with CWE-121, which describes heap-based buffer overflow conditions, and CWE-122, which covers stack-based buffer overflow vulnerabilities. The vulnerability exists in the network protocol handling layer where the device fails to implement proper input sanitization mechanisms before processing received packets.
The operational impact of this vulnerability extends beyond simple service disruption to create sustained availability issues for security monitoring systems. Attackers can maintain persistent denial of service by periodically sending the crafted UDP packets, effectively keeping the camera in a continuous reboot cycle that renders it useless for its intended security purposes. This creates a significant risk for organizations relying on these devices for surveillance, as the cameras become unavailable for critical monitoring functions. The vulnerability directly maps to attack techniques described in the MITRE ATT&CK framework under T1499.004 for network denial of service attacks and T1071.004 for application layer protocol usage, as it exploits weaknesses in network service handling and protocol implementation.
Mitigation strategies should include immediate network segmentation to isolate affected devices from critical network segments, implementing firewall rules to block UDP traffic on port 20188 from untrusted sources, and applying manufacturer-provided firmware updates when available. Network administrators should also consider implementing intrusion detection systems to monitor for the specific payload patterns associated with this vulnerability. The vulnerability highlights the importance of secure network protocol implementation and proper input validation, particularly for IoT devices that lack robust security controls. Organizations should also conduct comprehensive vulnerability assessments of their networked security equipment to identify similar weaknesses in other devices that may be vulnerable to similar exploitation techniques.