CVE-2023-47166 in UR32L
Summary
by MITRE • 05/01/2024
A firmware update vulnerability exists in the luci2-io file-import functionality of Milesight UR32L v32.3.0.7-r2. A specially crafted network request can lead to arbitrary firmware update. An attacker can send a network request to trigger this vulnerability.
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Analysis
by VulDB Data Team • 05/01/2024
The vulnerability identified as CVE-2023-47166 represents a critical firmware update flaw within the Milesight UR32L industrial device running firmware version 32.3.0.7-r2. This issue specifically affects the luci2-io file-import functionality, which serves as a critical interface for device management and configuration operations. The vulnerability stems from inadequate validation mechanisms within the firmware update process, allowing malicious actors to exploit the system through crafted network requests that bypass normal security controls. The affected device operates within industrial IoT environments where firmware integrity is paramount for operational continuity and security posture.
The technical exploitation of this vulnerability occurs through the luci2-io file-import component which handles file processing operations for device configuration and updates. When a malicious actor crafts a specific network request designed to manipulate the file import functionality, the system fails to properly validate the incoming firmware payload. This validation failure creates an arbitrary code execution pathway that allows unauthorized firmware updates to be installed on the device. The vulnerability demonstrates a classic lack of input sanitization and authentication controls within the firmware update mechanism, making it susceptible to remote exploitation without requiring physical access or legitimate credentials.
From an operational perspective, this vulnerability presents severe implications for industrial control systems and IoT deployments. The ability to perform arbitrary firmware updates remotely enables attackers to gain persistent control over the device, potentially leading to complete system compromise. The attack surface extends beyond simple device manipulation to include potential disruption of industrial processes, data exfiltration, or establishment of persistent backdoors within operational technology environments. The vulnerability particularly affects environments where Milesight UR32L devices are deployed for monitoring and control purposes, where unauthorized firmware modifications could result in significant operational disruptions.
Security mitigations for CVE-2023-47166 should focus on immediate network segmentation and access controls to limit exposure of affected devices to untrusted networks. Organizations must implement strict firewall rules that restrict access to the specific ports and protocols used by the luci2-io functionality, particularly when these services are exposed to external networks. The recommended approach includes disabling unnecessary network services, applying network access controls to limit who can communicate with the device, and implementing network monitoring to detect anomalous traffic patterns that may indicate exploitation attempts. Additionally, device firmware should be updated to versions that address the validation flaws, and organizations should establish robust change management processes for firmware updates that include integrity verification and secure deployment procedures. This vulnerability aligns with CWE-20 Input Validation and CWE-347 Improper Verification of Cryptographic Signature, and represents a potential technique in the ATT&CK framework under TA0003 Persistence and TA0004 Privilege Escalation categories.