CVE-2016-10818 in cPanel
Summary
by MITRE
cPanel before 57.9999.54 incorrectly sets log-file permissions in dnsadmin-startup and spamd-startup (SEC-124).
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Analysis
by VulDB Data Team • 11/14/2023
The vulnerability identified as CVE-2016-10818 affects cPanel versions prior to 57.9999.54 and represents a critical permission misconfiguration issue within the dnsadmin-startup and spamd-startup scripts. This flaw allows for improper file permission settings that can lead to unauthorized access to sensitive log files containing system information and potentially sensitive operational data. The vulnerability stems from the incorrect implementation of file permission controls during the startup processes of DNS and spam filtering services, creating potential security exposure points within the cPanel environment.
The technical root cause of this vulnerability lies in the improper handling of file permissions during service initialization. When the dnsadmin-startup and spamd-startup scripts execute, they fail to properly set restrictive permissions on log files that are created or modified during the startup sequence. This misconfiguration can result in log files being accessible to unauthorized users or processes within the system, potentially exposing sensitive operational details including configuration information, system paths, and potentially credential-related data that may be logged during service operations. The flaw specifically impacts the security posture of cPanel installations by creating information disclosure channels through improperly protected log files.
The operational impact of this vulnerability extends beyond simple information disclosure to potentially enable more sophisticated attacks. Attackers who can access these improperly protected log files may gain insights into the system configuration, service dependencies, and operational patterns that could be leveraged for further exploitation. This vulnerability aligns with CWE-732, which addresses incorrect permission assignment for critical resources, and represents a direct violation of the principle of least privilege in system security management. The exposure of log file contents can provide attackers with valuable reconnaissance information that may facilitate privilege escalation or other advanced persistent threats.
Organizations utilizing affected cPanel versions face significant security risks due to this permission misconfiguration. The vulnerability creates potential attack vectors for privilege escalation attacks where adversaries can exploit the information disclosure to craft more targeted exploitation strategies. From an attack framework perspective, this vulnerability maps to ATT&CK technique T1083 (File and Directory Discovery) and potentially T1068 (Exploitation for Privilege Escalation) when combined with other exploitation methods. The risk is particularly elevated in shared hosting environments where multiple users may have access to the system and could potentially exploit this weakness to gain unauthorized access to sensitive operational data.
Mitigation strategies for this vulnerability require immediate patching of cPanel installations to version 57.9999.54 or later, which contains the corrected permission handling logic for the affected startup scripts. System administrators should also implement regular permission audits of log file directories to ensure that log files maintain appropriate access controls and that no unauthorized access permissions have been inadvertently granted. Additional security measures include implementing log file monitoring to detect unauthorized access attempts and ensuring that automated systems properly enforce the principle of least privilege for all log file access. The vulnerability demonstrates the critical importance of proper file permission management in web hosting environments and highlights the need for regular security assessments of system initialization processes.