CVE-2018-20882 in cPanel
Summary
by MITRE
cPanel before 74.0.8 allows arbitrary file-write operations in the context of the root account during WHM Force Password Change (SEC-447).
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Analysis
by VulDB Data Team • 07/17/2020
This vulnerability exists within cPanel version 74.0.8 and earlier, specifically affecting the WHM Force Password Change functionality. The issue stems from insufficient input validation and improper access controls during the password change process, allowing malicious actors to manipulate file system operations. The vulnerability is particularly dangerous because it operates under the root account context, providing attackers with elevated privileges that can be leveraged for system compromise. This represents a critical privilege escalation flaw that undermines the security foundation of the hosting environment. The vulnerability is categorized under CWE-22 which describes improper limitation of a pathname to a restricted directory, commonly known as path traversal attacks. Attackers can exploit this weakness to write arbitrary files to sensitive system locations, potentially leading to complete system compromise. The operational impact extends beyond simple password changes as it enables persistent backdoor installation, configuration file modification, and privilege escalation to root level access. This vulnerability directly aligns with ATT&CK technique T1059 which involves executing malicious code through command and scripting interpreters, and T1068 which covers privilege escalation through local exploits. The flaw occurs during the WHM Force Password Change process where the application fails to properly sanitize user inputs, allowing directory traversal sequences to be processed as legitimate file paths. This creates a scenario where an attacker can manipulate the system to write files to arbitrary locations including system binaries, configuration files, or critical directories. The root account context amplifies the severity because any file written with root privileges can be leveraged to establish persistent access or modify core system components. Organizations running affected versions of cPanel are particularly vulnerable as this attack vector does not require authentication to the cPanel interface itself, making it accessible through various attack surfaces. The vulnerability demonstrates a fundamental lack of proper input sanitization and access control mechanisms that should be enforced at multiple layers of the application stack. This flaw represents a critical gap in the security architecture of the hosting platform, potentially allowing attackers to install malware, modify system configurations, or establish persistent access to compromised systems. Remediation requires immediate patching to cPanel version 74.0.8 or later, which addresses the improper input validation and strengthens access controls during password change operations. Additionally, organizations should implement network segmentation, monitor for unusual file system activity, and conduct regular security assessments to identify similar vulnerabilities in other components of their hosting infrastructure. The vulnerability underscores the importance of proper input validation and privilege separation in web applications, particularly those handling administrative functions and system-level operations. Security teams should also consider implementing additional monitoring for file system modifications during administrative processes and establish robust incident response procedures to address potential exploitation attempts.