CVE-2022-26073 in Eufy Homebase
Summary
by MITRE • 05/05/2022
A denial of service vulnerability exists in the libxm_av.so DemuxCmdInBuffer functionality of Anker Eufy Homebase 2 2.1.8.5h. A specially-crafted set of network packets can lead to a device reboot. An attacker can send packets to trigger this vulnerability.
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Analysis
by VulDB Data Team • 05/08/2022
The vulnerability identified as CVE-2022-26073 represents a critical denial of service weakness within the Anker Eufy Homebase 2 security system firmware version 2.1.8.5h. This issue specifically affects the libxm_av.so library component responsible for demultiplexing network commands through the DemuxCmdInBuffer functionality. The flaw manifests when the system processes malformed network packets that exploit an insufficient input validation mechanism within the video streaming and command processing pipeline. The affected device operates as a network-connected security hub that manages multiple camera feeds and communication protocols, making this vulnerability particularly concerning for home and small office security deployments.
The technical exploitation of this vulnerability occurs through the manipulation of network packet structures that are normally handled by the libxm_av.so library during the demultiplexing process. When the system receives specially crafted packets designed to overflow or corrupt the input buffer used by DemuxCmdInBuffer, the device's memory management system fails to properly handle the malformed data. This results in a system crash that ultimately triggers an automatic device reboot, effectively rendering the security system unavailable for its intended protective function. The vulnerability demonstrates a classic buffer overflow condition where insufficient bounds checking allows malicious input to corrupt memory structures, leading to system instability and denial of service.
The operational impact of CVE-2022-26073 extends beyond simple service disruption as it fundamentally compromises the security posture of affected installations. During a successful attack, the device becomes temporarily inaccessible for up to several minutes while it reboots, creating windows of vulnerability where security monitoring is suspended. This vulnerability aligns with CWE-121, which describes stack-based buffer overflow conditions, and represents a significant concern for the ATT&CK framework's privilege escalation and denial of service tactics. The attack vector requires only network access to the device, making it particularly dangerous as it can be exploited remotely without physical access. Security administrators face the challenge of maintaining continuous protection while the device reboots, potentially allowing intruders to exploit the brief window of system unavailability.
Mitigation strategies for this vulnerability should prioritize immediate firmware updates from Anker to address the underlying buffer management flaw in the libxm_av.so library. Network administrators should implement firewall rules to restrict access to the device's management interfaces and limit communication to trusted sources only. The vulnerability's nature suggests that implementing input validation at the network boundary could provide temporary protection while firmware updates are deployed. Organizations should also consider network segmentation to isolate security devices from critical infrastructure and implement monitoring solutions to detect unusual reboot patterns that might indicate exploitation attempts. The remediation process must account for the device's role in providing security services, ensuring that update procedures maintain system availability during the patching process. This vulnerability highlights the importance of secure coding practices in IoT devices and demonstrates how seemingly minor input validation failures can create significant operational risks.