CVE-2022-4978 in Remote Control Collection Server
Summary
by MITRE • 07/23/2025
Remote Control Server, maintained by Steppschuh, 3.1.1.12 allows unauthenticated remote code execution when authentication is disabled, which is the default configuration. The server exposes a custom UDP-based control protocol that accepts remote keyboard input events without verification. An attacker on the same network can issue a sequence of keystroke commands to launch a system shell and execute arbitrary commands, resulting in full system compromise.
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Analysis
by VulDB Data Team • 07/23/2025
The vulnerability described in CVE-2022-4978 represents a critical security flaw in the Remote Control Server software version 3.1.1.12 developed by Steppschuh. This remote code execution vulnerability stems from the software's default configuration that disables authentication mechanisms, creating an inherently insecure environment where any network user can exploit the system. The vulnerability specifically affects the server's UDP-based control protocol implementation, which serves as the primary attack vector for unauthorized access. The software's design fails to implement proper authentication checks or input validation, allowing malicious actors to directly interact with the system's keyboard input handling mechanisms without any verification processes. This fundamental architectural weakness transforms what should be a secure remote control solution into a potential entry point for complete system compromise.
The technical exploitation of this vulnerability occurs through the custom UDP-based protocol that the server exposes to network traffic. When authentication is disabled, the system accepts keyboard input events directly from remote sources without any form of verification or authorization checks. Attackers can craft specific sequences of keystroke commands that, when executed through this protocol, trigger system shell launches and enable arbitrary command execution. The vulnerability's exploitation path demonstrates a classic case of insufficient input validation and authentication controls, where the system fails to properly validate source legitimacy before processing user input. This type of flaw falls under CWE-284, which addresses improper access control issues, and specifically relates to CWE-77, which covers command injection vulnerabilities. The UDP protocol choice adds complexity to detection and mitigation efforts since UDP traffic is typically less monitored than TCP traffic in network security solutions.
The operational impact of this vulnerability extends far beyond simple unauthorized access, as it provides attackers with complete system compromise capabilities. Once an attacker successfully exploits this vulnerability, they gain the ability to execute arbitrary commands with the privileges of the running service, potentially leading to full system control. The default configuration of authentication disabled creates a scenario where any device on the same network segment can exploit this vulnerability, making it particularly dangerous in shared network environments or corporate networks where multiple devices may be connected. This vulnerability directly aligns with ATT&CK technique T1059, which covers command and scripting interpreter usage, and T1078, which addresses valid accounts usage. The compromised system becomes vulnerable to further attacks including lateral movement, data exfiltration, and persistent access establishment, as the attacker now has unrestricted command execution capabilities.
Mitigation strategies for CVE-2022-4978 must address both the immediate security gap and the underlying architectural flaws that enabled the vulnerability. The primary recommendation involves enabling authentication mechanisms within the Remote Control Server configuration, as the default insecure state creates an inherent risk that can be easily exploited. Network administrators should implement proper access controls by configuring strong authentication methods and ensuring that the UDP-based control protocol is not exposed to untrusted networks. Additional protective measures include network segmentation to isolate the server from general network traffic, implementing firewall rules to restrict UDP traffic to trusted sources only, and conducting regular security audits to verify that authentication remains enabled. Organizations should also consider updating to patched versions of the software if available, as this vulnerability represents a known security flaw that has likely been addressed in subsequent releases. The remediation process should include monitoring network traffic for suspicious UDP patterns and implementing intrusion detection systems capable of identifying potential exploitation attempts. Regular security awareness training for administrators is also crucial to prevent accidental misconfiguration that could leave the system vulnerable to similar attacks in the future.