CVE-2026-105981 in TK100
Summary
by MITRE • 11/03/2026
Improper input validation in the Digital I/O function may allow a remote attacker with high privileges to inject operating system commands and execute them with root privileges.
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Analysis
by VulDB Data Team • 11/03/2026
The vulnerability described constitutes a critical security flaw within the digital input/output subsystem of the affected device, specifically stemming from improper input validation mechanisms. This defect allows for command injection attacks that can be exploited by remote attackers who have already obtained high-level administrative access to the system. The core technical issue lies in the failure of the application or operating system interface to adequately sanitize or validate user-supplied data before it is processed as part of a system command execution sequence. When input parameters are passed directly into shell commands without rigorous checking for special characters, escape sequences, or malicious payloads, an attacker can manipulate these inputs to alter the intended logic of the command string. This typically involves injecting additional commands using delimiters such as semicolons, ampersands, or pipe operators, which allows the execution of arbitrary operating system instructions alongside the legitimate function call.
From a technical perspective, this vulnerability aligns with Common Weakness Enumeration (CWE) identifiers such as CWE-78 Improper Neutralization of Special Elements used in an OS Command and CWE-20 Improper Input Validation. The severity is exacerbated by the fact that the execution context operates with root privileges. In Unix-like operating systems, root access provides unrestricted control over the entire system, including the ability to modify kernel parameters, install malware, create backdoors, or exfiltrate sensitive data without restriction. Consequently, successful exploitation does not merely compromise a single application but results in full system takeover. The requirement for high-privilege initial access indicates that this vulnerability is likely exploitable only after an attacker has already breached perimeter defenses and authenticated with elevated credentials, suggesting it may serve as a privilege escalation vector or a mechanism to maintain persistence within the compromised environment rather than being directly accessible from unauthenticated external networks.
The operational impact of such a flaw is severe, particularly in industrial control systems, IoT devices, or network infrastructure where digital I/O functions are critical for monitoring and controlling physical processes. An attacker leveraging this vulnerability can disrupt operations by executing destructive commands, tamper with sensor readings or actuator controls, and compromise the integrity of connected systems. Furthermore, because root access is achieved, the attacker gains the ability to disable logging mechanisms, modify firewall rules, and install persistent malware that survives reboots. This significantly expands the attack surface for lateral movement within a network segment, allowing the compromised device to serve as a pivot point for further attacks against other critical assets. The presence of this vulnerability undermines the confidentiality, integrity, and availability principles central to information security frameworks like NIST SP 800-53 or ISO/IEC 27001.
Mitigation strategies must focus on both immediate remediation and long-term architectural improvements. Immediate actions should include applying vendor-provided patches that address the input validation logic in the digital I/O module, ensuring that all inputs are strictly validated against a whitelist of expected values rather than relying solely on blacklist approaches to filter malicious characters. If patching is not immediately feasible, network segmentation can help isolate devices with this vulnerability from critical infrastructure components and restrict administrative access to trusted management networks only. Long-term solutions involve implementing secure coding practices such as parameterized commands or API calls that separate code from data, thereby preventing the interpretation of user input as executable logic. Additionally, deploying intrusion detection systems tuned for command injection patterns can help identify attempted exploitation in real-time. Regular security audits and static application security testing should be integrated into the development lifecycle to detect similar validation flaws before deployment.