CVE-2017-18416 in cPanel
Summary
by MITRE
cPanel before 67.9999.103 allows arbitrary file-overwrite operations during a Roundcube SQLite schema update (SEC-303).
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Analysis
by VulDB Data Team • 07/18/2020
The vulnerability identified as CVE-2017-18416 represents a critical security flaw in cPanel versions prior to 67.9999.103 that enables unauthorized file overwrites during Roundcube SQLite schema updates. This issue stems from inadequate input validation and privilege escalation mechanisms within the cPanel administrative interface, specifically affecting the Roundcube webmail application integration. The vulnerability occurs when the system processes schema update operations for the SQLite database used by Roundcube, creating an opportunity for malicious actors to manipulate file operations and overwrite arbitrary files on the system.
The technical implementation of this vulnerability exploits a weakness in the file handling procedures during database schema migrations. When Roundcube performs its SQLite schema updates, the system fails to properly validate or sanitize file paths and operations, allowing attackers to inject malicious file paths that result in unintended file overwrites. This flaw operates at the application level within cPanel's webmail integration framework, where the update process does not adequately verify the integrity of file operations or enforce proper access controls. The vulnerability is particularly dangerous because it leverages legitimate administrative functions to achieve unauthorized file modifications, making detection more challenging.
The operational impact of CVE-2017-18416 extends beyond simple file overwrites to potentially enable complete system compromise. An attacker exploiting this vulnerability could overwrite critical system files, configuration files, or even executable components, leading to privilege escalation, persistent backdoors, or complete system takeover. The vulnerability affects organizations running cPanel installations that have not updated to the patched version, creating a significant risk for web hosting providers and enterprises that rely on cPanel for their hosting infrastructure. This flaw particularly impacts organizations with multiple user accounts, as it could allow one compromised account to affect the entire system's file integrity.
Mitigation strategies for this vulnerability require immediate application of the cPanel patch version 67.9999.103 or later, which addresses the improper file handling during Roundcube schema updates. Organizations should also implement additional security measures including restricting access to administrative interfaces, implementing network segmentation, and monitoring file system changes for suspicious activity. The vulnerability aligns with CWE-22 Improper Limitation of a Pathname to a Restricted Directory, and can be categorized under ATT&CK technique T1059 Command and Scripting Interpreter for potential post-exploitation activities. System administrators should conduct thorough audits of affected systems, verify patch installations, and implement automated monitoring to detect unauthorized file modifications that may indicate exploitation attempts.