CVE-2016-7443 in Exponent
Summary
by MITRE
Exponent CMS 2.3.0 through 2.3.9 allows remote attackers to have unspecified impact via vectors related to "uploading files to wrong location."
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Analysis
by VulDB Data Team • 02/17/2023
The vulnerability identified as CVE-2016-7443 affects Exponent CMS versions 2.3.0 through 2.3.9 and represents a critical file upload misconfiguration that enables remote attackers to execute arbitrary code on affected systems. This flaw resides in the content management system's file handling mechanisms, specifically within the file upload functionality that lacks proper validation and sanitization of uploaded files. The vulnerability allows attackers to upload malicious files to incorrect directories within the application's file structure, potentially leading to privilege escalation, remote code execution, or complete system compromise.
The technical implementation of this vulnerability stems from inadequate input validation and improper file path handling within the CMS's upload module. When users or attackers attempt to upload files through the web interface, the system fails to properly verify the file type, destination directory, or file permissions before storing the uploaded content. This misconfiguration creates opportunities for attackers to manipulate the file upload process and place malicious payloads in locations where they can be executed by the web server. The vulnerability aligns with CWE-434 which describes insecure file upload vulnerabilities, and specifically relates to improper file handling and path traversal issues that are commonly exploited in web application attacks.
The operational impact of CVE-2016-7443 extends beyond simple unauthorized file placement, as it can lead to complete system compromise and data breach scenarios. Attackers exploiting this vulnerability can upload web shells, backdoor scripts, or other malicious executables that persist on the server and provide ongoing access to the compromised environment. The unspecified impact mentioned in the CVE description suggests that the consequences could range from local privilege escalation to full remote code execution capabilities. This vulnerability particularly affects organizations using Exponent CMS versions within the specified range, as these installations lack proper security controls to prevent unauthorized file placement in critical system directories.
Security professionals should prioritize immediate remediation of this vulnerability through patch management and application updates to the latest stable versions of Exponent CMS. Organizations should implement network segmentation and web application firewalls to monitor and restrict file upload activities to minimize potential attack surface. The mitigation strategies should include comprehensive input validation, proper file type checking, and strict access controls on upload directories. Additionally, regular security audits and penetration testing should verify that file upload mechanisms function correctly and that no unauthorized file placement occurs. This vulnerability demonstrates the critical importance of proper file handling security controls and aligns with ATT&CK technique T1190 which covers exploit public-facing application vulnerabilities, highlighting the need for continuous security monitoring and timely patch deployment to prevent exploitation of such critical flaws in content management systems.