CVE-2004-1770 in cPanel
Summary
by MITRE
The login page for cPanel 9.1.0, and possibly other versions, allows remote attackers to execute arbitrary code via shell metacharacters in the user parameter.
Be aware that VulDB is the high quality source for vulnerability data.
Analysis
by VulDB Data Team • 07/06/2025
The vulnerability identified as CVE-2004-1770 represents a critical remote code execution flaw in cPanel version 9.1.0 and potentially other iterations of the software. This issue resides within the authentication mechanism of the web-based control panel, specifically affecting the login page's handling of user input parameters. The flaw demonstrates a classic command injection vulnerability where malicious actors can manipulate the system by inserting shell metacharacters into the user parameter during the login process. Such vulnerabilities are particularly dangerous as they can be exploited without requiring prior authentication, making them attractive targets for attackers seeking to compromise web servers and their underlying infrastructure.
The technical exploitation of this vulnerability stems from improper input validation and sanitization within the cPanel login handling code. When the system processes the user parameter containing shell metacharacters such as semicolons, ampersands, or backticks, it fails to properly escape or filter these characters before using them in system commands. This oversight creates a pathway for attackers to inject arbitrary shell commands that execute with the privileges of the web server process. The vulnerability directly maps to CWE-77 which describes improper neutralization of special elements used in a command, and more specifically to CWE-94 which addresses the execution of arbitrary code. The attack vector operates through the standard HTTP protocol where an attacker simply needs to craft a malicious request containing shell metacharacters in the user parameter field.
The operational impact of CVE-2004-1770 extends far beyond simple unauthorized access, as successful exploitation can lead to complete system compromise. Attackers can leverage this vulnerability to execute arbitrary commands on the target server, potentially gaining root access or escalating privileges to perform actions such as installing backdoors, exfiltrating sensitive data, modifying system configurations, or deploying malware. The implications are particularly severe for hosting providers and organizations relying on cPanel for server management, as a successful attack could compromise multiple websites hosted on the same server. This vulnerability aligns with ATT&CK technique T1059 which covers command and scripting interpreter, specifically targeting the execution of malicious commands through web-based interfaces. Organizations may face significant data breaches, service disruption, and compliance violations if this vulnerability remains unpatched.
Mitigation strategies for CVE-2004-1770 should prioritize immediate patching of affected cPanel installations to the latest secure versions. System administrators must implement proper input validation and sanitization measures to prevent shell metacharacters from being processed in user-supplied parameters. Network-level protections including web application firewalls and intrusion prevention systems can provide additional defense in depth layers. Regular security audits and input validation testing should be conducted to identify similar vulnerabilities in other applications. The vulnerability highlights the importance of following secure coding practices such as input sanitization, output encoding, and proper command execution handling as recommended by OWASP and other security frameworks. Organizations should also implement monitoring and logging of authentication attempts to detect potential exploitation attempts, as the attack pattern typically involves malicious input in login parameters.