CVE-2018-19798 in Fleet Maintenance Management
Summary
by MITRE
Fleetco Fleet Maintenance Management (FMM) 1.2 and earlier allows uploading an arbitrary ".php" file with the application/x-php Content-Type to the accidents_add.php?submit=1 URI, as demonstrated by the value_Images_1 field, which leads to remote command execution on the remote server. Any authenticated user can exploit this.
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Analysis
by VulDB Data Team • 03/03/2020
This vulnerability exists in Fleetco Fleet Maintenance Management version 1.2 and earlier, representing a critical file upload flaw that enables remote command execution. The vulnerability stems from insufficient input validation and file type verification mechanisms within the application's upload functionality. Attackers can exploit this weakness by uploading malicious php files with the application/x-php Content-Type to the specific URI accidents_add.php?submit=1, targeting the value_Images_1 field which serves as the upload interface for accident-related images.
The technical implementation of this vulnerability involves a lack of proper file extension and content type validation. When authenticated users submit files through the accidents_add.php endpoint, the application fails to adequately verify the file type or content, allowing php files to be uploaded directly to the web server. This occurs because the application does not properly sanitize the file upload process, enabling attackers to bypass security checks that should prevent execution of php scripts. The vulnerability is particularly dangerous because it requires only authenticated access, meaning any legitimate user with valid credentials can exploit this flaw.
The operational impact of this vulnerability is severe and far-reaching. Successful exploitation allows attackers to execute arbitrary commands on the remote server with the privileges of the web application. This creates a complete compromise of the affected system, enabling attackers to access sensitive data, modify system configurations, install backdoors, or establish persistent access. The vulnerability affects the entire fleet maintenance management system, potentially compromising vehicle data, maintenance records, and operational information. Additionally, the compromised system could serve as a foothold for lateral movement within the organization's network, especially if the application shares resources or databases with other systems.
The vulnerability aligns with CWE-434, which describes "Unrestricted Upload of File with Dangerous Type," and represents a classic example of insecure file handling practices. From an attack perspective, this vulnerability maps to the ATT&CK technique T1190 - Exploit Public-Facing Application, and T1059 - Command and Scripting Interpreter, as it enables command execution through uploaded malicious files. Organizations should implement immediate mitigations including restricting file upload functionality, implementing strict file type validation, and removing unnecessary upload capabilities. Additionally, proper input sanitization, content type verification, and access controls should be enforced to prevent unauthorized file uploads. Regular security audits and penetration testing should be conducted to identify similar vulnerabilities in other components of the fleet management system.