CVE-2023-5347 in JetNet
Summary
by MITRE • 01/09/2024
An Improper Verification of Cryptographic Signature vulnerability in the update process of Korenix JetNet Series allows replacing the whole operating system including Trusted Executables. This issue affects JetNet devices older than firmware version 2024/01.
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Analysis
by VulDB Data Team • 10/08/2025
The vulnerability identified as CVE-2023-5347 represents a critical weakness in the cryptographic signature verification mechanism of Korenix JetNet Series devices, specifically within their firmware update process. This flaw falls under the category of improper cryptographic verification as classified by CWE-328, where the system fails to adequately validate the authenticity and integrity of update packages. The affected devices operate with firmware versions prior to 2024/01, indicating that this represents a long-standing security gap that has persisted through multiple firmware iterations. The vulnerability's severity is amplified by the fact that it allows for complete operating system replacement, including the Trusted Executables that form the core security foundation of these industrial network devices.
The technical implementation of this vulnerability stems from inadequate cryptographic signature validation during the update process, which creates an exploitable condition where malicious actors can craft and deploy counterfeit firmware updates. This weakness enables attackers to bypass the intended security controls that should prevent unauthorized modifications to the device's operating system. The ability to replace Trusted Executables is particularly concerning as these components typically contain critical security functions and system-level operations that maintain device integrity and security posture. Attackers exploiting this vulnerability could potentially gain persistent control over the device, manipulate network traffic, or establish backdoor access points within the network infrastructure.
Operationally, this vulnerability presents significant risks for industrial environments where Korenix JetNet devices are deployed, as these systems often serve as critical network infrastructure components. The impact extends beyond individual device compromise to potentially affect entire network segments, especially when multiple devices are connected to the same network fabric. The vulnerability's exploitation could result in denial of service conditions, data exfiltration, or the establishment of persistent command and control channels. Organizations using these devices face potential regulatory compliance issues, particularly in sectors governed by standards such as NIST SP 800-82 for industrial control systems or IEC 62443 for industrial automation and control systems. The attack vector typically involves network-based exploitation where attackers can intercept or inject malicious update packages, making this vulnerability particularly dangerous in environments with limited network segmentation or monitoring capabilities.
Mitigation strategies for CVE-2023-5347 should prioritize immediate firmware updates to version 2024/01 or later, which presumably contain the necessary cryptographic signature verification improvements. Organizations must also implement network monitoring to detect anomalous update traffic patterns or unauthorized firmware modifications. The implementation of secure update protocols with proper cryptographic validation should be enforced through network security policies, potentially utilizing techniques such as digital signatures, certificate pinning, or secure boot mechanisms. From an ATT&CK framework perspective, this vulnerability aligns with techniques such as T1547.001 (Registry Run Keys / Startup Folder) and T1078.004 (Valid Accounts: Cloud Accounts) when exploited for persistent access, while also representing a potential initial access vector through T1190 (Exploit Public-Facing Application) if the update process is exposed to untrusted network segments. Network administrators should consider implementing update server isolation, where firmware updates are distributed through secure, authenticated channels rather than directly from potentially compromised network locations.