CVE-2007-4326 in Bilder Uploader
Summary
by MITRE
Multiple PHP remote file inclusion vulnerabilities in Bilder Uploader 1.3 allow remote attackers to execute arbitrary PHP code via a URL in the config[root_ordner] parameter to (1) gruppen.php, (2) bild.php, (3) feed.php, (4) mitglieder.php, (5) online.php, (6) profil.php, and possibly other unspecified PHP scripts.
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Analysis
by VulDB Data Team • 10/31/2017
The CVE-2007-4326 vulnerability represents a critical remote file inclusion flaw affecting Bilder Uploader version 1.3, which operates within PHP environments and exposes multiple attack vectors through improper input validation mechanisms. This vulnerability stems from the application's failure to properly sanitize user-supplied input parameters, specifically targeting the config[root_ordner] parameter that is processed across several core PHP scripts. The flaw allows malicious actors to inject arbitrary URLs that are then included and executed by the PHP interpreter, effectively enabling remote code execution capabilities. The vulnerability impacts multiple files including gruppen.php, bild.php, feed.php, mitglieder.php, online.php, and profil.php, indicating a systemic issue in the application's parameter handling architecture that affects the entire upload and user management system.
The technical exploitation of this vulnerability follows a well-established pattern that aligns with CWE-88, which describes improper neutralization of special elements used in an expression, specifically in the context of remote file inclusion attacks. Attackers can construct malicious URLs that, when passed through the vulnerable config[root_ordner] parameter, are directly included using PHP's include or require functions without proper validation or sanitization. This creates a direct pathway for arbitrary code execution, as the PHP interpreter treats the injected URL as a legitimate script location and processes its contents as PHP code. The attack requires minimal privileges and can be executed remotely, making it particularly dangerous for web applications that are publicly accessible. The vulnerability's scope extends beyond the explicitly mentioned files, suggesting that the application's architecture contains a fundamental flaw in how it handles dynamic file inclusion operations.
The operational impact of CVE-2007-4326 is severe and multifaceted, as it provides attackers with complete control over the affected web server's execution environment. Successful exploitation can result in unauthorized access to sensitive data, server compromise, and potential lateral movement within network infrastructures. The vulnerability enables attackers to upload and execute malicious payloads, establish backdoors, or conduct further reconnaissance activities against the compromised system. Additionally, the impact extends to data integrity and availability, as attackers can modify or delete critical application files and user data. From a compliance perspective, this vulnerability violates fundamental security principles and could result in regulatory violations for organizations that fail to maintain secure web applications. The long-term consequences include potential data breaches, reputation damage, and financial losses due to system compromise and recovery efforts.
Mitigation strategies for CVE-2007-4326 must address both immediate remediation and long-term architectural improvements. The primary solution involves implementing strict input validation and sanitization mechanisms that prevent user-supplied data from being interpreted as file paths or URLs. This includes disabling remote file inclusion features entirely by configuring PHP's allow_url_include directive to false, which prevents the inclusion of remote resources. Additionally, developers should implement whitelisting mechanisms that only permit specific, trusted directories or files to be included, rather than accepting arbitrary paths. The application should employ proper parameter validation that rejects any input containing URL schemes or special characters that could enable inclusion attacks. Security hardening measures include disabling dangerous PHP functions such as eval, system, and exec, and implementing proper access controls and authentication mechanisms to limit exposure. Organizations should also consider implementing web application firewalls and intrusion detection systems to monitor for suspicious activity patterns associated with file inclusion attacks. Regular security audits and code reviews are essential to identify similar vulnerabilities in other components and ensure that security measures remain effective against evolving threat landscapes. The vulnerability's classification under ATT&CK technique T1190 emphasizes the need for comprehensive network security controls to prevent exploitation attempts and detect unauthorized access attempts.