CVE-2003-1436 in Nukebrowser
Summary
by MITRE
PHP remote file inclusion vulnerability in nukebrowser.php in Nukebrowser 2.1 to 2.5 allows remote attackers to execute arbitrary PHP code via the filhead parameter.
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Analysis
by VulDB Data Team • 01/05/2025
The vulnerability identified as CVE-2003-1436 represents a critical remote file inclusion flaw in the Nukebrowser web application version 2.1 through 2.5. This vulnerability resides within the nukebrowser.php script and specifically targets the filhead parameter which is used to include files dynamically. The flaw stems from insufficient input validation and sanitization mechanisms that fail to properly restrict the file paths accepted by the application. Attackers can exploit this weakness by manipulating the filhead parameter to reference malicious remote files, thereby enabling arbitrary code execution on the target server. This type of vulnerability falls under the category of CWE-98 Improper Control of Generation of Code, which is classified as a code injection vulnerability where attacker-controlled data is used to generate executable code. The vulnerability directly aligns with ATT&CK technique T1190 - Exploit Public-Facing Application, as it allows adversaries to leverage publicly accessible web interfaces to execute malicious commands. The impact of this vulnerability extends beyond simple code execution, as it can enable complete system compromise and unauthorized access to sensitive data stored on the affected server.
The technical exploitation of this vulnerability occurs when an attacker crafts a malicious URL containing the filhead parameter with a remote file reference. When the vulnerable application processes this parameter without proper validation, it includes the remote file and executes its contents as PHP code. This process typically involves referencing external resources such as malicious PHP scripts hosted on attacker-controlled servers, which can contain commands for data exfiltration, system reconnaissance, or deployment of backdoors. The vulnerability is particularly dangerous because it allows attackers to bypass traditional security controls by leveraging the legitimate file inclusion mechanisms of the web application. The flaw demonstrates poor input handling practices where user-supplied data is directly incorporated into file path resolution without adequate sanitization or whitelisting. This vulnerability type is classified as a remote code execution vulnerability and represents a significant risk to web application security, as it can be exploited without requiring authentication or physical access to the system.
The operational impact of CVE-2003-1436 extends far beyond the immediate execution of malicious code, as it provides attackers with persistent access to the compromised system and potentially the entire network infrastructure. Once successfully exploited, attackers can establish persistent backdoors, escalate privileges, and use the compromised server as a launch point for further attacks against internal systems. The vulnerability can lead to complete system compromise, data theft, and service disruption, making it a critical concern for organizations relying on vulnerable web applications. Security professionals must understand that this vulnerability can be leveraged in conjunction with other attack vectors, such as credential theft or privilege escalation techniques, to maximize the damage potential. The exploitation of such vulnerabilities often results in long-term security breaches, as attackers can maintain access even after initial detection and remediation efforts. Organizations affected by this vulnerability may face regulatory compliance issues, financial losses, and reputational damage due to the unauthorized access and potential data exposure.
Mitigation strategies for CVE-2003-1436 require immediate action to address the core vulnerability through code-level fixes and configuration changes. The primary remediation involves implementing strict input validation and sanitization for all user-supplied parameters, particularly those used in file inclusion operations. Organizations should implement whitelisting mechanisms that only permit specific, known good file paths rather than accepting arbitrary input. Additionally, disabling remote file inclusion features entirely and using absolute paths for file operations can prevent exploitation. Security configurations should include disabling the allow_url_include directive in PHP settings to prevent the inclusion of remote files. System administrators must also implement proper access controls and monitor application logs for suspicious file inclusion patterns. The implementation of web application firewalls and intrusion detection systems can provide additional layers of protection against exploitation attempts. Regular security assessments and code reviews should be conducted to identify similar vulnerabilities in other applications and ensure that proper security practices are followed throughout the software development lifecycle. Organizations should also consider implementing automated patch management processes to ensure timely remediation of known vulnerabilities. The vulnerability highlights the importance of following secure coding practices and adhering to security standards such as those outlined in the OWASP Top Ten and NIST guidelines for web application security.