CVE-2021-38758 in Online Catering Reservation System
Summary
by MITRE • 08/16/2021
Directory traversal in Online Catering Reservation System due to lack of validation in index.php.
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Analysis
by VulDB Data Team • 08/18/2021
The vulnerability identified as CVE-2021-38758 represents a critical directory traversal flaw within the Online Catering Reservation System application. This security weakness stems from inadequate input validation mechanisms implemented in the index.php file, which serves as the primary entry point for user interactions with the system. The absence of proper sanitization and validation checks creates an exploitable condition that allows malicious actors to manipulate file paths and access restricted system resources. Directory traversal vulnerabilities of this nature are particularly dangerous because they can enable attackers to read arbitrary files, execute unauthorized commands, or potentially compromise the entire underlying system infrastructure. The vulnerability specifically affects the web application's handling of user-supplied data that is processed through the index.php script, making it a prime target for exploitation.
The technical implementation of this flaw manifests when the application fails to properly validate or sanitize user input that is subsequently used to construct file paths or directory references. Attackers can exploit this weakness by crafting malicious input that includes directory traversal sequences such as ../ or ..\, which bypass normal access controls and allow them to navigate outside the intended directory structure. This particular vulnerability falls under the CWE-22 category, which specifically addresses directory traversal or path traversal attacks, a well-documented and frequently exploited weakness in web applications. The issue demonstrates how insufficient input validation can lead to severe consequences, as the application does not properly enforce access controls or validate the legitimacy of file path requests from external sources.
The operational impact of CVE-2021-38758 extends beyond simple data exposure, potentially enabling full system compromise and unauthorized access to sensitive information. An attacker who successfully exploits this vulnerability could gain access to configuration files, database credentials, user data, and potentially execute arbitrary code on the server. This type of vulnerability directly impacts the confidentiality, integrity, and availability of the catering reservation system, as it allows unauthorized parties to manipulate or extract critical business data. The attack surface is particularly concerning given that the vulnerability resides in the index.php file, which likely serves as the main application interface, making it accessible to all users without proper authentication. Organizations using this system face significant risks including data breaches, regulatory compliance violations, and potential financial losses due to compromised customer information.
Mitigation strategies for CVE-2021-38758 must focus on implementing robust input validation and sanitization mechanisms throughout the application. The primary remediation involves adding comprehensive validation checks to the index.php file to ensure all user-supplied input is properly sanitized before being processed or used in file path construction. This includes implementing proper path validation, using allowlists for acceptable file paths, and ensuring that all relative path references are properly resolved within designated directories. Organizations should also consider implementing proper access controls, input filtering, and output encoding to prevent malicious input from being processed. Additionally, the system should be configured to run with minimal privileges and implement proper logging mechanisms to detect and respond to potential exploitation attempts. These measures align with the ATT&CK framework's mitigation strategies for path traversal attacks and address the core weakness identified in the vulnerability. Regular security testing and code reviews should be conducted to prevent similar issues from emerging in other parts of the application.