CVE-2016-10759 in Precurio
Summary
by MITRE
The Xinha plugin in Precurio 2.1 allows Directory Traversal, with resultant arbitrary code execution, via ExtendedFileManager/Classes/ExtendedFileManager.php because ExtendedFileManager can be used to rename the .htaccess file that blocks .php uploads.
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Analysis
by VulDB Data Team • 09/24/2023
The vulnerability identified as CVE-2016-10759 resides within the Xinha plugin of Precurio 2.1, representing a critical security flaw that enables directory traversal attacks leading to arbitrary code execution. This vulnerability stems from insufficient input validation and improper access controls within the ExtendedFileManager component, specifically in the ExtendedFileManager.php file located at ExtendedFileManager/Classes/ExtendedFileManager.php. The flaw allows attackers to manipulate file operations through the file renaming functionality, which creates a pathway for privilege escalation and remote code execution.
The technical mechanism behind this vulnerability operates through a specific chain of events that begins with the ExtendedFileManager's ability to rename files within the system. When an attacker can rename files, they exploit the system's lack of proper access control enforcement to target the .htaccess file, which serves as a critical security mechanism blocking php file uploads. This file renaming capability bypasses the intended security restrictions that should prevent php files from being uploaded and executed within the web application context. The vulnerability is classified under CWE-22 as a Directory Traversal, and its exploitation aligns with ATT&CK technique T1059.007 for Command and Scripting Interpreter, specifically targeting PHP execution.
The operational impact of this vulnerability is severe and multifaceted, as it provides attackers with complete control over the affected web server. Once exploited, an attacker can upload and execute malicious PHP code, potentially leading to data breaches, system compromise, and further lateral movement within the network. The vulnerability affects the core security model of the application, as it undermines the fundamental principle of restricting file uploads to prevent malicious code execution. The attack vector is particularly concerning because it leverages legitimate file management functionality to gain unauthorized access, making detection more difficult and the attack harder to prevent through traditional security measures.
Mitigation strategies for CVE-2016-10759 should focus on implementing strict file access controls and input validation mechanisms. Organizations should immediately update to the latest version of Precurio or apply vendor-specific patches that address the file renaming functionality within the ExtendedFileManager component. Security measures must include restricting the ability to rename critical system files such as .htaccess, implementing proper file type validation, and enforcing strict access controls for file management operations. Additionally, network segmentation and monitoring solutions should be deployed to detect suspicious file operations and unauthorized access attempts. The vulnerability demonstrates the importance of principle of least privilege and proper input sanitization, as recommended by security frameworks such as OWASP Top 10 and NIST Cybersecurity Framework. Regular security assessments and penetration testing should be conducted to identify similar flaws in other components of the application stack, ensuring comprehensive protection against similar directory traversal and code execution vulnerabilities.