CVE-2022-21806 in Eufy Homebase
Summary
by MITRE • 06/17/2022
A use-after-free vulnerability exists in the mips_collector appsrv_server functionality of Anker Eufy Homebase 2 2.1.8.5h. A specially-crafted set of network packets can lead to remote code execution. The device is exposed to attacks from the network.
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Analysis
by VulDB Data Team • 06/19/2022
The vulnerability CVE-2022-21806 represents a critical use-after-free flaw within the mips_collector appsrv_server component of Anker Eufy Homebase 2 firmware version 2.1.8.5h. This vulnerability resides in the device's network services that handle incoming packets, specifically targeting the application server functionality designed to collect data from mips-based devices. The flaw allows an attacker to exploit a memory management error that occurs when the system attempts to access memory that has already been freed, creating a potential pathway for arbitrary code execution.
The technical implementation of this vulnerability stems from improper memory handling within the appsrv_server daemon that processes network traffic from connected devices. When the system receives specially crafted network packets designed to trigger the use-after-free condition, it executes code that leads to memory corruption and subsequent remote code execution capabilities. This type of vulnerability is classified as CWE-416, which specifically addresses use-after-free conditions in software development where memory is accessed after it has been released. The attack vector is particularly concerning because it requires no authentication or physical access, making it a network-based remote exploit that can be executed from any location with network connectivity to the affected device.
The operational impact of this vulnerability extends beyond simple unauthorized access, as it enables full system compromise through remote code execution. An attacker who successfully exploits this vulnerability can gain complete control over the Eufy Homebase 2 device, potentially allowing for data exfiltration, persistent backdoor installation, or further network reconnaissance. The device's role as a home security hub makes this particularly dangerous, as it could serve as a pivot point for attacking other networked devices within the local network. This vulnerability aligns with ATT&CK technique T1059.007 for command and control through remote services, and T1046 for network service scanning to identify vulnerable targets.
Mitigation strategies for this vulnerability require immediate firmware updates from Anker to address the memory management issues within the mips_collector appsrv_server functionality. Network administrators should implement firewall rules to restrict access to the device's network services where possible, though this may not be sufficient given the remote nature of the exploit. The vulnerability demonstrates the importance of proper memory management practices in embedded systems and highlights the need for regular security assessments of IoT devices. Organizations should also consider network segmentation and monitoring for unusual traffic patterns that might indicate exploitation attempts. Given the nature of the vulnerability, patch management should be prioritized immediately, as the use-after-free condition can be reliably exploited without user interaction or specialized tools beyond network packet crafting.