CVE-2018-19329 in GreenCMS
Summary
by MITRE
GreenCMS v2.3.0603 allows remote authenticated administrators to delete arbitrary files by modifying a base64-encoded pathname in an m=admin&c=media&a=delfilehandle&id= call, related to the m=admin&c=media&a=restorefile delete button.
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Analysis
by VulDB Data Team • 06/11/2023
The vulnerability CVE-2018-19329 represents a critical file deletion flaw in GreenCMS version 2.3.0603 that enables authenticated administrative users to perform unauthorized file removal operations on the target system. This issue stems from insufficient input validation and improper path handling within the content management system's media management functionality. The vulnerability specifically affects the file deletion mechanism that processes base64-encoded pathnames through the administrative interface, creating a path traversal condition that allows attackers to manipulate file system operations beyond their intended scope.
The technical exploitation of this vulnerability occurs through a carefully crafted HTTP request that modifies the base64-encoded pathname parameter within the URL structure m=admin&c=media&a=delfilehandle&id=. The attacker must first authenticate as an administrator to access the administrative panel, after which they can manipulate the restorefile functionality to execute arbitrary file deletion commands. The vulnerability is particularly concerning because it leverages the legitimate administrative capabilities of the system while bypassing normal file access controls and validation mechanisms that should prevent such operations.
From an operational perspective, this vulnerability creates a significant risk for organizations using GreenCMS v2.3.0603 as it allows for potential data loss, system compromise, and service disruption. An authenticated attacker could delete critical system files, configuration data, user uploads, or even executable components that would severely impact system functionality and availability. The attack vector is relatively straightforward requiring only administrative credentials and knowledge of the specific URL structure, making it accessible to attackers who have gained administrative access through other means or who can exploit additional vulnerabilities to obtain administrative privileges.
The vulnerability maps to CWE-22 Path Traversal and CWE-770 Allocation of Resources Without Limits or Throttling, as it allows for arbitrary file system access without proper boundary checks and resource limitations. From an ATT&CK framework perspective, this vulnerability aligns with T1078 Valid Accounts for initial access and T1485 Data Destruction for the potential impact of file deletion operations. The flaw represents a privilege escalation issue within the context of existing administrative access, where the attacker can leverage their legitimate administrative rights to perform operations beyond normal expected behavior.
Organizations should implement immediate mitigations including upgrading to a patched version of GreenCMS, implementing input validation controls for all pathname parameters, and restricting administrative access to only necessary personnel. Network segmentation and monitoring of administrative activities can help detect unauthorized file deletion attempts. Additionally, implementing proper access controls and least privilege principles for administrative accounts can limit the potential impact of such vulnerabilities. The vulnerability highlights the importance of validating all user-supplied input, particularly when dealing with file system operations, and demonstrates why proper path validation and resource allocation controls are essential for maintaining system integrity.