CVE-2026-105980 in TK100
Summary
by MITRE • 11/03/2026
Improper input validation in the WireGuard VPN function may allow a remote attacker with high privileges to inject system commands and execute them with root privileges.
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Analysis
by VulDB Data Team • 11/03/2026
The vulnerability described involves an improper input validation flaw within the WireGuard virtual private network implementation, specifically affecting functions that handle configuration or command processing. This security weakness arises when the software fails to adequately sanitize or verify user-supplied data before passing it to underlying system commands or interpreters. In a typical deployment scenario involving elevated privileges, such as running with root access for network interface management and key handling, this lack of validation creates a direct pathway for remote code execution. An attacker who has already achieved high-level authentication within the WireGuard environment can exploit this flaw by crafting malicious input strings that contain shell metacharacters or command injection payloads. Because the vulnerable function executes these inputs with root privileges, the resulting system commands are granted full administrative control over the host operating system.
From a technical perspective, this issue aligns closely with CWE-78, which defines Improper Neutralization of Special Elements used in an OS Command, commonly known as OS Command Injection. The core mechanism relies on the application treating untrusted input as executable code rather than data. When WireGuard processes configuration updates or peer additions through a vulnerable interface, it may pass parameters directly to shell interpreters like /bin/sh without escaping special characters such as semicolons, pipes, or backticks. This allows an attacker to terminate the intended command and append arbitrary system commands. The severity of this vulnerability is significantly amplified by the privilege level required for exploitation; while many injection flaws require low-level access, this specific instance demands high privileges, indicating that the attack vector likely involves compromising a WireGuard peer configuration or administrative API endpoint rather than exploiting an unauthenticated network service directly.
The operational impact of successfully exploiting this vulnerability is catastrophic for system integrity and confidentiality. Once command execution is achieved with root privileges, the attacker gains complete control over the affected host. This includes the ability to install persistent backdoors, exfiltrate sensitive data stored on the machine, modify security configurations, or pivot into other network segments protected by the WireGuard tunnel. The compromise extends beyond the immediate system, as a rooted WireGuard node can serve as a trusted entry point for lateral movement within an organization's secure infrastructure. Attackers may leverage this access to disable logging mechanisms, alter firewall rules, or establish command and control channels that bypass traditional perimeter defenses due to the encrypted nature of VPN traffic.
Mitigation strategies must address both immediate remediation and long-term architectural resilience. The primary defense is applying vendor-provided patches that update WireGuard to a version where input validation has been rigorously enforced for all administrative functions. Developers should implement strict allow-listing for configuration parameters, ensuring that only expected alphanumeric characters or specific formats are accepted, thereby eliminating the possibility of shell metacharacter injection. Additionally, employing principle of least privilege is critical; if possible, WireGuard operations should be segregated into services running with minimal necessary permissions rather than full root access where feasible. Security monitoring tools should also be configured to detect anomalous process creation events originating from WireGuard binaries, which can serve as an early warning indicator for exploitation attempts in environments where patching cannot occur immediately. This vulnerability is often associated with ATT&CK technique T1059 Command and Scripting Interpreter, highlighting the need for behavioral detection rules that monitor for unusual command-line arguments executed by network management processes.