CVE-2019-12792 in Control Panel
Summary
by MITRE
A command injection vulnerability in UploadHandler.php in Vesta Control Panel 0.9.8-24 allows remote attackers to escalate from regular registered users to root.
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Analysis
by VulDB Data Team • 11/25/2023
The vulnerability identified as CVE-2019-12792 represents a critical command injection flaw within the Vesta Control Panel 0.9.8-24 software ecosystem. This vulnerability exists in the UploadHandler.php component which processes file uploads and subsequently executes system commands without adequate input sanitization or validation. The flaw enables malicious actors to inject arbitrary commands that are then executed with elevated privileges, creating a pathway for privilege escalation from standard user accounts to root access. This represents a severe security weakness that undermines the fundamental security model of the control panel.
The technical implementation of this vulnerability stems from improper handling of user-supplied data within the upload processing pipeline. When users upload files through the web interface, the UploadHandler.php script fails to properly validate or sanitize the filenames and associated metadata before incorporating them into system commands. This lack of input validation creates a command injection vector where attackers can manipulate the upload process to execute arbitrary shell commands on the underlying system. The vulnerability is particularly dangerous because it allows unauthenticated or low-privileged users to leverage this flaw for privilege escalation, bypassing normal access controls that should prevent such elevated operations.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it provides attackers with complete control over the hosting environment. Once an attacker successfully exploits this vulnerability, they can execute commands with root privileges, potentially leading to full system compromise, data exfiltration, or the installation of persistent backdoors. The implications are severe for any organization using Vesta Control Panel, as compromised systems can serve as launching points for further attacks within network infrastructure, and the root access enables attackers to modify system configurations, install malicious software, or destroy critical data. This vulnerability directly violates the principle of least privilege and creates a significant attack surface that can be exploited for lateral movement and persistent access.
Organizations should implement immediate mitigations including applying the latest security patches from Vesta Control Panel maintainers, disabling unnecessary upload functionality where possible, and implementing network segmentation to limit access to control panel interfaces. Additional protective measures include deploying web application firewalls to detect and block malicious upload patterns, implementing strict file type validation, and monitoring system logs for suspicious command execution patterns. This vulnerability aligns with CWE-77 and CWE-88 categories related to command injection and improper input handling, and represents a technique that would be categorized under ATT&CK tactic TA0003 (Persistence) and TA0004 (Privilege Escalation) within the MITRE ATT&CK framework. Regular security assessments and penetration testing should be conducted to identify similar vulnerabilities in other components of the hosting infrastructure.