CVE-2018-20932 in cPanel
Summary
by MITRE
cPanel before 70.0.23 exposes Apache HTTP Server logs after creation of certain domains (SEC-406).
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Analysis
by VulDB Data Team • 07/18/2020
The vulnerability identified as CVE-2018-20932 represents a critical information disclosure flaw within cPanel versions prior to 70.0.23. This security weakness specifically affects the Apache HTTP Server log handling mechanisms within the cPanel environment, creating a scenario where sensitive operational data becomes accessible to unauthorized users. The issue stems from improper access control measures that fail to adequately restrict visibility of log files generated during domain creation processes. When administrators create new domains through the cPanel interface, the system generates corresponding Apache log files that should remain protected within the server's secure administrative boundaries. However, due to the flawed implementation, these log files are inadvertently exposed to users who should not have access to such information.
The technical exploitation of this vulnerability occurs through the manipulation of file paths and access permissions within the cPanel framework. During domain provisioning, Apache generates log files that contain detailed information about web server operations, including request patterns, user agent strings, and potentially sensitive data about server configurations. The flaw allows attackers to access these log files through direct web requests or by exploiting the cPanel's file access mechanisms. This exposure creates a significant risk as log files often contain information that could aid in further attacks, including server configuration details, user activities, and potential system vulnerabilities that attackers could leverage for privilege escalation or lateral movement within the affected environment. The vulnerability specifically relates to the SEC-406 security advisory and demonstrates a failure in proper privilege separation and access control enforcement.
The operational impact of CVE-2018-20932 extends beyond simple information disclosure, as the exposed Apache logs may contain sensitive data that could compromise the overall security posture of the affected systems. Attackers who exploit this vulnerability can gain insights into web server behavior, identify potentially vulnerable applications, and gather intelligence about the target environment's configuration and operational patterns. This information can be particularly valuable for advanced persistent threat actors seeking to plan more sophisticated attacks against the compromised infrastructure. The vulnerability also violates fundamental security principles of least privilege and principle of least information exposure, as it allows unauthorized access to operational data that should remain restricted to authorized system administrators. The exposure of Apache logs can reveal information about server internals, application behavior, and user activities that could be leveraged for additional attacks or to craft more targeted exploitation techniques.
Organizations affected by this vulnerability should implement immediate mitigations including upgrading to cPanel version 70.0.23 or later, which contains the necessary security patches to address the improper access control issue. System administrators should also conduct thorough audits of existing log file permissions and access controls to ensure that no unauthorized access paths remain available. Additional defensive measures include implementing web application firewalls to monitor for suspicious access patterns, configuring proper file system permissions to restrict access to log directories, and establishing monitoring procedures to detect unauthorized access attempts to sensitive system files. The vulnerability aligns with CWE-284, which addresses improper access control, and represents a clear violation of security best practices as outlined in the ATT&CK framework under the privilege escalation and defense evasion techniques. Organizations should also consider implementing automated security scanning tools to identify similar access control flaws in other system components and ensure comprehensive protection against information disclosure vulnerabilities.