CVE-2021-37764 in XOS-Shop
Summary
by MITRE • 06/17/2022
Arbitrary File Deletion vulnerability in XOS-Shop xos_shop_system 1.0.9 via current_manufacturer_image parameter to /shop/admin/manufacturers.php.
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Analysis
by VulDB Data Team • 06/17/2022
The CVE-2021-37764 vulnerability represents a critical arbitrary file deletion flaw discovered in the XOS-Shop xos_shop_system version 1.0.9 administration interface. This vulnerability specifically affects the manufacturers.php script within the shop/admin directory, where the application fails to properly validate or sanitize user input parameters. The vulnerability is triggered through the current_manufacturer_image parameter, which is processed without adequate security controls, allowing malicious actors to manipulate the file deletion process.
The technical implementation of this vulnerability stems from insufficient input validation and inadequate access control mechanisms within the administrative functionality of the e-commerce platform. When an attacker submits a crafted current_manufacturer_image parameter to the manufacturers.php endpoint, the application processes this input directly without verifying whether the specified file path is within acceptable boundaries or if the user possesses appropriate privileges to delete the targeted file. This lack of proper sanitization creates a path traversal condition where arbitrary files on the server can be deleted, potentially including critical system files, configuration data, or other sensitive resources.
The operational impact of this vulnerability extends beyond simple file deletion capabilities, as it provides attackers with a means to compromise the integrity and availability of the entire e-commerce platform. An attacker who successfully exploits this vulnerability could potentially delete essential application files, configuration databases, or even system-critical components that would render the shop completely inoperable. The vulnerability also creates opportunities for further exploitation, as the deletion of key files could be used as part of a broader attack strategy to establish persistent access or to cause denial of service conditions. The administrative context of the vulnerability means that successful exploitation would require either administrative credentials or a way to bypass authentication, though the severity remains high regardless of the initial access method.
Security mitigations for this vulnerability should focus on implementing proper input validation and parameter sanitization within the application's administrative components. The system should enforce strict path validation to ensure that file operations only occur within designated directories and that all user-supplied file paths are properly sanitized. Additionally, implementing robust access control mechanisms and ensuring that administrative functions require proper authentication and authorization checks would significantly reduce the risk of exploitation. The vulnerability aligns with CWE-22 Path Traversal and CWE-770 Resource Exhaustion categories, and represents a technique that could be categorized under ATT&CK tactics such as T1499.004 Endpoint Denial of Service and T1078 Valid Accounts. Organizations should immediately apply patches or implement workarounds that restrict file operations to predefined safe directories, implement proper input validation, and conduct thorough security assessments of all administrative interfaces to prevent similar vulnerabilities from being exploited in other components of the system.