CVE-2008-7021 in Jobs Portal Script
Summary
by MITRE
Unrestricted file upload vulnerability in editlogo.php in AvailScript Jobs Portal Script allows remote authenticated users to execute arbitrary code by uploading a file with an executable extension as an image or logo, then accessing it via a direct request to the file in an unspecified directory.
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Analysis
by VulDB Data Team • 11/04/2024
The CVE-2008-7021 vulnerability represents a critical unrestricted file upload flaw within the AvailScript Jobs Portal Script that fundamentally compromises the security posture of affected systems. This vulnerability exists in the editlogo.php component of the application, which processes file uploads for image and logo modifications. The flaw stems from inadequate input validation and sanitization mechanisms that fail to properly restrict file types, allowing authenticated users to bypass normal upload restrictions and upload malicious files with executable extensions. The vulnerability is particularly dangerous because it operates within a legitimate administrative function, making it more likely to be exploited without immediate detection.
The technical implementation of this vulnerability involves a lack of proper file extension validation and content type checking within the file upload process. Attackers can exploit this by uploading a file with an executable extension such as .php, .asp, or .jsp, which would otherwise be rejected by the system's normal upload restrictions. The system's failure to properly validate file contents or enforce strict extension whitelisting creates an attack surface where malicious files can be successfully uploaded to the server. The vulnerability is further exacerbated by the fact that the uploaded files are stored in an unspecified directory, meaning attackers can predict or discover the file locations and execute them through direct web requests. This combination of factors creates a path for remote code execution that bypasses typical security controls.
The operational impact of CVE-2008-7021 is severe and multifaceted, as it provides attackers with persistent remote code execution capabilities on affected systems. Once an attacker successfully uploads a malicious file, they can execute arbitrary commands on the web server, potentially leading to complete system compromise, data theft, or further lateral movement within the network. The vulnerability affects authenticated users, meaning that an attacker would need valid credentials to exploit it, but this requirement is often achievable through various social engineering or credential compromise techniques. The direct accessibility of uploaded files through web requests eliminates the need for additional attack vectors, making exploitation straightforward and highly effective. This vulnerability directly aligns with CWE-434, which describes the weakness of unrestricted upload of file with dangerous type, and corresponds to attack techniques in the MITRE ATT&CK framework under T1190 for Exploit Public-Facing Application.
Mitigation strategies for CVE-2008-7021 require a multi-layered approach that addresses both the immediate vulnerability and broader security practices. Organizations should implement strict file type validation by maintaining comprehensive whitelists of allowed extensions and rejecting all others, while also performing content-based file type verification to prevent file name spoofing attacks. The system should enforce proper file naming conventions, store uploaded files outside the web root directory, and implement proper access controls to prevent direct execution of uploaded files. Additionally, organizations must ensure that all file uploads undergo thorough security scanning and that proper input validation is implemented throughout the application's file handling processes. The remediation efforts should include immediate patching of the affected AvailScript Jobs Portal Script, implementing proper web application firewall rules to detect and block suspicious file upload attempts, and conducting comprehensive security audits to identify similar vulnerabilities in other components of the application stack.