CVE-2020-10119 in cPanel
Summary
by MITRE
cPanel before 84.0.20 allows a demo account to achieve remote code execution via a cpsrvd rsync shell (SEC-544).
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Analysis
by VulDB Data Team • 04/17/2024
The vulnerability identified as CVE-2020-10119 represents a critical security flaw in cPanel versions prior to 84.0.20 that enables demo accounts to achieve remote code execution through a cpsrvd rsync shell mechanism. This vulnerability specifically targets the demonstration account functionality within cPanel's web hosting management interface, creating a pathway for unauthorized remote code execution that could compromise entire hosting environments. The flaw resides in how the system handles rsync shell operations within the cpsrvd process, which is responsible for managing cPanel's daemon services.
The technical implementation of this vulnerability exploits the insufficient access controls and privilege separation mechanisms within the cPanel demo account system. When a demo user interacts with rsync operations, the cpsrvd process fails to properly validate or restrict the commands being executed, allowing the demo account to escalate privileges and execute arbitrary shell commands on the underlying system. This represents a classic privilege escalation vulnerability where limited user access is leveraged to achieve full system control. The vulnerability aligns with CWE-269, which addresses privilege escalation issues, and specifically relates to improper privilege management within daemon processes.
The operational impact of this vulnerability extends beyond individual compromised accounts to potentially affect entire hosting infrastructures. An attacker with access to a demo account could execute commands with the privileges of the cpsrvd process, which typically runs with elevated system permissions. This could enable attackers to access sensitive data, modify system configurations, install backdoors, or compromise other accounts sharing the same hosting environment. The attack vector is particularly concerning because demo accounts are often less strictly monitored than regular user accounts, making them attractive targets for exploitation. This vulnerability maps to ATT&CK technique T1059.007 for command and scripting interpreter and T1078.004 for valid accounts, as it leverages legitimate account access to achieve unauthorized system control.
Mitigation strategies for CVE-2020-10119 primarily focus on immediate system updates to cPanel version 84.0.20 or later, which includes patches addressing the privilege escalation in the cpsrvd rsync shell handling. System administrators should also implement additional security controls such as disabling demo accounts in production environments where possible, implementing strict network segmentation, and monitoring for unusual rsync activity. The vulnerability highlights the importance of proper privilege separation and access control mechanisms within web hosting management systems, particularly for processes that handle user requests. Organizations should conduct comprehensive security assessments of their cPanel installations to identify and remediate similar privilege escalation vulnerabilities, while also implementing robust logging and monitoring solutions to detect potential exploitation attempts.