CVE-2020-36364 in Smartstore
Summary
by MITRE • 05/20/2021
An issue was discovered in Smartstore (aka SmartStoreNET) before 4.1.0. Administration/Controllers/ImportController.cs allows path traversal (for copy and delete actions) in the ImportController.Create method via a TempFileName field.
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Analysis
by VulDB Data Team • 05/22/2021
This vulnerability exists in Smartstore versions prior to 4.1.0 where the ImportController.cs file contains a path traversal flaw in the Create method. The issue specifically affects the Administration/Controllers/ImportController.cs component and allows unauthorized users to manipulate the TempFileName field to perform copy and delete operations on arbitrary file paths. The vulnerability stems from insufficient input validation and sanitization of user-supplied file names, enabling attackers to traverse the file system beyond the intended directory boundaries. This type of vulnerability falls under CWE-22 Path Traversal and represents a critical security risk that can lead to unauthorized file access, modification, or deletion across the system.
The technical exploitation of this vulnerability occurs when an attacker crafts a malicious TempFileName value that includes directory traversal sequences such as ../ or ..\ which allows them to navigate outside the intended application directories. During copy and delete operations, the application processes these crafted paths without proper validation, resulting in the execution of unintended file system operations. The flaw is particularly dangerous because it enables attackers to potentially access sensitive system files, overwrite critical application components, or delete essential data files. This vulnerability can be leveraged to escalate privileges and gain deeper access to the underlying system infrastructure.
The operational impact of this vulnerability extends beyond simple file system manipulation as it can enable attackers to compromise the entire application environment. Successful exploitation allows for unauthorized access to application data, potential privilege escalation, and could lead to complete system compromise. Attackers might use this vulnerability to plant malicious files, modify application behavior, or exfiltrate sensitive data from the system. The vulnerability also increases the risk of denial of service conditions when critical files are deleted or overwritten, potentially causing application downtime and business disruption.
Organizations using Smartstore versions prior to 4.1.0 should immediately implement mitigations including upgrading to the patched version 4.1.0 or later. Additional defensive measures should include implementing strict input validation for all user-supplied file names, applying proper file path sanitization techniques, and restricting file system permissions for application directories. Network segmentation and monitoring should be enhanced to detect suspicious file system access patterns. The vulnerability aligns with ATT&CK technique T1059 Command and Scripting Interpreter and T1078 Valid Accounts, as it can be exploited through legitimate administrative interfaces while potentially leveraging compromised credentials to execute malicious file operations. Regular security assessments and penetration testing should be conducted to identify similar path traversal vulnerabilities in other components of the application stack.