CVE-2019-8433 in JTBC(PHP)
Summary
by MITRE
JTBC(PHP) 3.0.1.8 allows Arbitrary File Upload via the console/#/console/file/manage.php?type=list URI, as demonstrated by a .php file.
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Analysis
by VulDB Data Team • 07/11/2023
The vulnerability identified as CVE-2019-8433 affects JTBC PHP version 3.0.1.8 and represents a critical arbitrary file upload flaw that enables remote attackers to execute malicious code on affected systems. This vulnerability exists within the web application's file management functionality, specifically through the console interface at the URI console/#/console/file/manage.php?type=list. The flaw stems from inadequate input validation and improper file type restrictions within the file upload mechanism, allowing attackers to bypass security controls and upload malicious files directly to the server.
The technical implementation of this vulnerability demonstrates a classic lack of proper file validation controls, which aligns with CWE-434 - Unrestricted Upload of File with Dangerous Type. Attackers can exploit this weakness by uploading a malicious php file through the exposed management interface, potentially gaining remote code execution capabilities. The vulnerability's exploitation pathway involves sending a crafted HTTP request containing a php payload to the vulnerable endpoint, where the application fails to properly validate the file extension or content type before storing the file on the server filesystem. This flaw represents a fundamental breakdown in the application's security architecture and violates the principle of least privilege by allowing unauthorized file operations.
The operational impact of this vulnerability is severe and multifaceted, as it provides attackers with persistent access to the affected system and enables them to establish backdoors, exfiltrate data, or launch further attacks within the network. Once a malicious file is uploaded successfully, the attacker can execute arbitrary code with the privileges of the web application, potentially leading to complete system compromise. The vulnerability also aligns with ATT&CK technique T1190 - Exploit Public-Facing Application, as it targets a publicly accessible web interface. Organizations running affected JTBC PHP installations face significant risk of data breaches, service disruption, and potential lateral movement within their network infrastructure.
Mitigation strategies for CVE-2019-8433 should focus on immediate patching of the affected JTBC PHP version, implementing robust file validation mechanisms, and restricting file upload capabilities to authorized users only. Organizations should deploy proper input validation that checks file extensions against a strict whitelist of allowed types, implement content type verification, and ensure that uploaded files are stored in non-executable directories. Network segmentation and access controls should be enforced to limit access to the console management interface, while regular security audits and penetration testing should be conducted to identify similar vulnerabilities. Additionally, implementing web application firewalls and monitoring for suspicious file upload activities can help detect and prevent exploitation attempts. The remediation process should also include disabling unnecessary file upload functionality and ensuring that all file operations are properly authenticated and authorized, aligning with security best practices outlined in the OWASP Top Ten and NIST Cybersecurity Framework.