CVE-2019-16663 in rConfig
Summary
by MITRE
An issue was discovered in rConfig 3.9.2. An attacker can directly execute system commands by sending a GET request to search.crud.php because the catCommand parameter is passed to the exec function without filtering, which can lead to command execution.
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Analysis
by VulDB Data Team • 12/08/2019
The vulnerability identified as CVE-2019-16663 represents a critical command injection flaw in rConfig version 3.9.2 that exposes the system to remote code execution attacks. This issue stems from insufficient input validation and sanitization within the search.crud.php script, where user-supplied parameters are directly incorporated into system commands without proper filtering mechanisms. The vulnerability specifically affects the catCommand parameter which is passed to the exec function, creating an avenue for malicious actors to execute arbitrary system commands on the affected server.
From a technical perspective, this vulnerability aligns with CWE-77 and CWE-94 categories, representing command injection and code injection weaknesses respectively. The flaw operates at the application layer where user input flows directly into system execution contexts without proper sanitization or validation. The attack vector is particularly dangerous as it requires only a simple GET request to exploit the vulnerability, making it accessible to attackers with minimal technical expertise. The exec function in PHP executes shell commands and returns the last line of output, but when combined with unfiltered user input, it becomes a gateway for complete system compromise.
The operational impact of this vulnerability extends beyond simple unauthorized command execution, as it can lead to full system compromise and persistent access. An attacker could leverage this vulnerability to escalate privileges, install backdoors, exfiltrate sensitive data, or use the compromised system as a pivot point for further attacks within the network infrastructure. The vulnerability affects the core functionality of rConfig's search capabilities, where legitimate users might be able to perform system operations through the search interface, but malicious actors can abuse this functionality to gain unauthorized access to the underlying operating system.
Security professionals should consider this vulnerability in the context of ATT&CK framework's T1059.001 technique for command and scripting interpreter, as it enables adversaries to execute commands through the targeted application. The lack of input validation creates a direct path for attackers to bypass normal application security controls, potentially leading to complete system takeover. Organizations using rConfig 3.9.2 should implement immediate mitigations including input validation, parameter sanitization, and the principle of least privilege for application users. The recommended remediation involves filtering and sanitizing all user inputs before processing, implementing proper access controls, and upgrading to patched versions of rConfig to prevent exploitation of this critical vulnerability.