CVE-2014-8085 in OSClass
Summary
by MITRE
Unrestricted file upload vulnerability in the CWebContact::doModel method in oc-includes/osclass/controller/contact.php in OSClass before 3.4.3 allows remote attackers to execute arbitrary PHP code by uploading a file with a PHP extension, then accessing it via a direct request to the file in an unspecified directory.
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Analysis
by VulDB Data Team • 06/13/2024
The CVE-2014-8085 vulnerability represents a critical unrestricted file upload flaw in OSClass versions prior to 3.4.3, specifically within the CWebContact::doModel method located in oc-includes/osclass/controller/contact.php. This vulnerability falls under the category of CWE-434, which addresses "Unrestricted Upload of File with Dangerous Type," making it a severe security risk that can lead to complete system compromise. The flaw exists in the contact form functionality where user input is not properly validated or sanitized, creating an opportunity for malicious actors to upload malicious files directly to the web server.
The technical implementation of this vulnerability allows remote attackers to bypass normal file upload restrictions by simply uploading a file with a PHP extension, such as .php, .phtml, or .php3, to the server. When the file is uploaded successfully, it gets stored in an unspecified directory within the web root, making it directly accessible via HTTP requests. This means that once an attacker successfully uploads a malicious PHP file, they can execute arbitrary code on the target server by simply requesting the file through a web browser or HTTP client. The vulnerability is particularly dangerous because it does not require any authentication or privileged access to exploit, making it a significant threat to any OSClass installation that has not been updated to version 3.4.3 or later.
From an operational perspective, this vulnerability provides attackers with a direct path to execute arbitrary code on the affected server, potentially leading to complete system compromise. Attackers can upload web shells, backdoors, or other malicious payloads that can be used to maintain persistent access, escalate privileges, or exfiltrate sensitive data from the server. The impact extends beyond simple code execution, as the vulnerability can be leveraged to perform further reconnaissance, establish command and control channels, or even pivot to attack other systems within the network. This type of vulnerability is particularly concerning in environments where OSClass is used for business listings, classified ads, or other web applications that may contain sensitive user data or business-critical information.
The exploitation of CVE-2014-8085 aligns with several techniques documented in the MITRE ATT&CK framework, particularly under the T1190 - Exploit Public-Facing Application and T1059 - Command and Scripting Interpreter tactics. The vulnerability represents a classic example of how insufficient input validation can lead to remote code execution, making it a common target for automated exploitation tools and manual attackers alike. Organizations using OSClass should immediately implement mitigations including updating to version 3.4.3 or later, implementing proper file upload validation mechanisms, restricting file types that can be uploaded, and configuring web server restrictions to prevent execution of uploaded files in web-accessible directories. Additionally, implementing proper access controls, regular security audits, and monitoring for unusual file upload activities can help detect and prevent exploitation attempts. The vulnerability underscores the critical importance of keeping web applications updated and implementing robust input validation and file handling mechanisms as part of a comprehensive security posture.