CVE-2008-5732 in KafooeyBlog
Summary
by MITRE
Unrestricted file upload vulnerability in lib/image_upload.php in KafooeyBlog 1.55b allows remote attackers to execute arbitrary code by uploading a file with an executable extension, then accessing it via a direct request to the file.
Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.
Analysis
by VulDB Data Team • 04/02/2025
The vulnerability identified as CVE-2008-5732 represents a critical unrestricted file upload flaw within the KafooeyBlog 1.55b content management system, specifically affecting the lib/image_upload.php component. This issue stems from inadequate input validation and sanitization mechanisms that fail to properly restrict file types accepted during the upload process. The vulnerability classifies under CWE-434 which defines unrestricted file upload as a weakness where applications allow users to upload files without proper restrictions on file types, potentially enabling malicious file execution. The flaw enables remote attackers to bypass security controls by uploading malicious files with executable extensions such as .php, .asp, or .jsp, which can then be executed on the web server.
The technical exploitation of this vulnerability occurs through a straightforward but dangerous attack vector where an authenticated or unauthenticated user can upload a specially crafted file containing malicious code. Once the file is successfully uploaded to the server, it becomes accessible via direct HTTP requests to the file's location, allowing attackers to execute arbitrary commands on the vulnerable system. The vulnerability's impact is amplified by the fact that the uploaded files are stored in a location accessible via the web server, eliminating the need for additional attack vectors to achieve remote code execution. This flaw essentially provides attackers with a persistent backdoor mechanism to compromise the entire web application and potentially the underlying server infrastructure.
From an operational perspective, this vulnerability creates significant security risks for organizations using KafooeyBlog 1.55b, as it allows for complete system compromise through relatively simple means. The attack surface extends beyond immediate code execution to include potential privilege escalation, data exfiltration, and further network reconnaissance. The vulnerability aligns with ATT&CK technique T1190 which describes the use of web shells and file upload capabilities for maintaining access to compromised systems. Organizations may face regulatory compliance violations and reputational damage if such vulnerabilities are exploited, particularly in environments where sensitive data is processed or stored. The lack of proper file extension validation and content type checking means that even files with misleading extensions can be uploaded and executed, making detection and prevention particularly challenging.
Mitigation strategies for this vulnerability must address both immediate remediation and long-term security hardening. The most effective immediate solution involves implementing strict file type validation that rejects executable extensions and verifies file content through multiple methods including MIME type checking and file signature validation. Organizations should also implement proper file upload restrictions by storing uploaded files outside the web root directory and using randomized filenames to prevent direct access. Additional measures include implementing web application firewalls to monitor and block suspicious upload patterns, enforcing strict access controls on upload directories, and regularly updating the application to patched versions. The vulnerability demonstrates the critical importance of input validation and the principle of least privilege in web application security, as outlined in industry best practices for preventing similar flaws in modern applications.