CVE-2020-28593 in Smart Air Fryer CS158-AF
Summary
by MITRE • 04/15/2021
A unauthenticated backdoor exists in the configuration server functionality of Cosori Smart 5.8-Quart Air Fryer CS158-AF 1.1.0. A specially crafted JSON object can lead to code execution. An attacker can send a malicious packet to trigger this vulnerability.
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Analysis
by VulDB Data Team • 04/21/2021
The vulnerability identified as CVE-2020-28593 represents a critical security flaw in the Cosori Smart 5.8-Quart Air Fryer CS158-AF model running firmware version 1.1.0. This issue manifests as an unauthenticated backdoor within the device's configuration server functionality, fundamentally compromising the security posture of connected IoT devices. The vulnerability specifically affects the device's handling of JSON objects in its configuration interface, creating an attack surface that allows remote code execution without any authentication requirements.
The technical implementation of this vulnerability stems from improper input validation within the device's configuration server component. When the device processes specially crafted JSON objects through its network interface, it fails to properly sanitize or validate the incoming data structure. This lack of input validation creates a path for malicious actors to inject arbitrary code that executes within the device's operational environment. The vulnerability is classified under CWE-20 as a weakness in input validation, where the system does not adequately validate or sanitize user-supplied data before processing it. The attack vector requires only network access to the device's configuration interface, making it particularly dangerous as it can be exploited remotely without physical access or prior authentication credentials.
The operational impact of this vulnerability extends beyond simple unauthorized access, as it enables full code execution capabilities on the affected device. An attacker who successfully exploits this vulnerability can gain complete control over the air fryer's operational functions, potentially manipulating cooking parameters, accessing device memory, or even using the device as a pivot point for further attacks within a network. This represents a significant risk to both personal safety and privacy, as malicious actors could potentially alter cooking instructions or access sensitive data stored within the device's memory. The unauthenticated nature of the backdoor means that any individual with network access to the device can exploit this vulnerability, making it particularly concerning for IoT deployments where devices are often left unattended and accessible on home networks.
Mitigation strategies for this vulnerability should focus on both immediate remediation and long-term security improvements. The primary recommendation involves firmware updates from the manufacturer to address the input validation flaw and close the backdoor access path. Organizations and individuals should implement network segmentation to isolate IoT devices from critical network segments and apply network access controls to restrict communication to only necessary services. Additionally, monitoring network traffic for unusual JSON object patterns or unauthorized configuration changes can help detect exploitation attempts. This vulnerability aligns with ATT&CK technique T1059.007 for command and scripting interpreter, as the exploitation results in code execution capabilities that can be leveraged for further malicious activities. The security implications highlight the importance of secure coding practices and proper input validation in IoT device development, particularly in embedded systems where resource constraints often lead to insufficient security controls.