CVE-2019-14393 in cPanel
Summary
by MITRE
cPanel before 80.0.5 allows local code execution in the context of a different cPanel account because of insecure cpphp execution (SEC-486).
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Analysis
by VulDB Data Team • 07/16/2020
The vulnerability identified as CVE-2019-14393 represents a critical local privilege escalation issue within cPanel versions prior to 80.0.5, where an attacker can execute arbitrary code in the context of another cPanel account. This flaw stems from insecure execution of cpphp scripts, which are typically used for PHP execution within the cPanel environment. The vulnerability specifically affects the way cPanel handles the execution of these scripts, creating a path for unauthorized code execution that bypasses normal account isolation mechanisms.
The technical root cause of this vulnerability lies in the improper handling of cpphp execution contexts, where the system fails to properly validate or restrict the execution environment for PHP scripts. This allows a malicious actor with access to one cPanel account to potentially escalate privileges and execute code as if they were operating from a different account. The flaw essentially breaks the fundamental security boundary that separates user accounts within the cPanel infrastructure, creating a scenario where account isolation is compromised. According to CWE classification, this vulnerability maps to CWE-269: "Improper Privilege Management" and CWE-78: "Improper Neutralization of Special Elements used in an OS Command", as it involves both privilege escalation and command execution flaws.
The operational impact of this vulnerability is severe for organizations relying on cPanel for hosting services, as it enables attackers to gain unauthorized access to other users' data and resources. An attacker could potentially access sensitive information, modify files, create backdoors, or even escalate to root privileges depending on the system configuration. The vulnerability is particularly dangerous in shared hosting environments where multiple customers share the same server infrastructure, as it could allow a single compromised account to serve as a foothold for attacking other accounts on the same server. This aligns with ATT&CK technique T1078.004: "Valid Accounts: Cloud Accounts" and T1548.001: "Abuse Elevation Control Mechanisms: Setuid and Setgid" in how it exploits account-based privilege mechanisms.
Organizations should immediately update to cPanel version 80.0.5 or later to remediate this vulnerability, as the patch addresses the insecure cpphp execution by implementing proper context validation and access controls. System administrators should also review account permissions and implement additional monitoring for unusual script execution patterns. The vulnerability highlights the importance of proper privilege management and secure coding practices in web hosting environments, particularly when handling user account isolation and script execution contexts. Regular security audits of hosting environments and maintaining up-to-date software versions remain critical defensive measures against similar vulnerabilities in the cPanel ecosystem.