CVE-2017-18469 in cPanel
Summary
by MITRE
cPanel before 62.0.17 allows demo accounts to execute code via an NVData_fetchinc API call (SEC-233).
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Analysis
by VulDB Data Team • 07/21/2020
The vulnerability identified as CVE-2017-18469 represents a critical security flaw in cPanel versions prior to 62.0.17 that enables unauthorized code execution through the NVData_fetchinc API call. This issue specifically affects demo accounts, which are typically created to provide limited access to cPanel functionality for demonstration purposes. The vulnerability stems from insufficient input validation and access control mechanisms within the NVData_fetchinc API endpoint, allowing malicious actors with demo account credentials to escalate privileges and execute arbitrary code on the affected system.
The technical exploitation of this vulnerability occurs through a specific API call pattern that bypasses normal authorization checks. The NVData_fetchinc function, designed to retrieve configuration data, fails to properly validate the input parameters provided by the API caller. This validation gap allows attackers to manipulate the API request to include malicious payloads that are subsequently executed with the privileges of the cPanel service account. The flaw aligns with CWE-20, which describes improper input validation, and represents a classic case of privilege escalation through API misconfiguration. The vulnerability is particularly concerning because it leverages the inherent trust placed in demo accounts, which are often considered less secure than regular user accounts but still maintain access to system resources.
From an operational perspective, the impact of this vulnerability extends beyond simple code execution to potentially compromise entire hosting environments. When demo accounts are compromised, attackers can access sensitive configuration data, modify system settings, and potentially pivot to other systems within the hosting infrastructure. The vulnerability affects cPanel installations where demo accounts are enabled, making it a widespread concern for hosting providers and system administrators who maintain these demonstration environments. The attack vector is particularly dangerous because it requires minimal privileges to exploit, as demo accounts typically have limited but still functional access to the system's API endpoints. This vulnerability maps to ATT&CK technique T1078.004, which covers valid accounts with restricted access, and T1059, which encompasses command and scripting interpreter usage.
Organizations affected by this vulnerability should immediately implement comprehensive mitigation strategies to protect their systems. The primary recommendation involves upgrading to cPanel version 62.0.17 or later, which includes patched validation mechanisms for the NVData_fetchinc API call. Additionally, system administrators should disable demo accounts when they are not actively needed, as these accounts represent unnecessary attack vectors. Network segmentation and monitoring of API access patterns can help detect anomalous behavior that might indicate exploitation attempts. The implementation of principle of least privilege should be enforced, ensuring that demo accounts have minimal required permissions. Regular security audits of API endpoints and access controls should be conducted to identify similar vulnerabilities, with particular attention to functions that handle data retrieval and configuration management. Organizations should also consider implementing intrusion detection systems that can identify suspicious API call patterns and automatically alert security teams to potential exploitation attempts.