CVE-2008-6513 in aphpkb
Summary
by MITRE
Unrestricted file upload vulnerability in saa.php in Andy s PHP Knowledgebase (aphpkb) 0.92.9 allows remote attackers to execute arbitrary code by uploading a file with an executable extension, then accessing it via a link that is listed by authors.php.
If you want to get the best quality for vulnerability data then you always have to consider VulDB.
Analysis
by VulDB Data Team • 11/12/2024
The CVE-2008-6513 vulnerability represents a critical unrestricted file upload flaw in the Andy s PHP Knowledgebase (aphpkb) version 0.92.9 web application. This vulnerability resides within the saa.php script which handles file uploads, creating a pathway for remote attackers to compromise the affected system through malicious file execution. The flaw specifically permits attackers to upload files with executable extensions, bypassing proper validation mechanisms that should prevent such uploads from being stored or executed within the web server environment.
This vulnerability operates under the Common Weakness Enumeration CWE-434 which classifies unrestricted file uploads as a serious security weakness allowing attackers to upload malicious files that can execute arbitrary code on the target system. The vulnerability's exploitation pathway is particularly concerning as it leverages the application's authors.php script to enumerate and access the uploaded malicious files, effectively creating a persistent backdoor or execution channel. The attack vector enables remote code execution through simple file upload operations, making it highly accessible to attackers with minimal technical expertise.
The operational impact of this vulnerability extends beyond simple code execution to encompass complete system compromise. Attackers can upload web shells, malicious scripts, or other executable payloads that persistently reside on the web server, allowing them to maintain access, escalate privileges, and potentially use the compromised system as a launch point for further attacks within the network. The vulnerability's persistence is enhanced by the fact that uploaded files are accessible through the authors.php listing mechanism, providing attackers with an easy method to verify successful uploads and execute their payloads. This represents a significant risk to organizations relying on the affected knowledgebase application for content management and knowledge sharing.
Mitigation strategies for CVE-2008-6513 should implement multiple layers of defense including strict file type validation, proper file extension filtering, and secure file storage practices. Organizations must ensure that all file uploads undergo rigorous validation processes that reject executable file types and enforce proper content type checking. The implementation of secure file upload mechanisms should include storing uploaded files outside the web root directory, implementing proper file naming conventions, and establishing strict access controls. Additionally, regular security assessments and application updates should be conducted to prevent similar vulnerabilities from being exploited through the MITRE ATT&CK framework's techniques for command and control, persistence, and privilege escalation. The vulnerability demonstrates the critical importance of input validation and secure coding practices in preventing remote code execution attacks that can lead to complete system compromise.