CVE-2018-20646 in Basic B2B Script
Summary
by MITRE
PHP Scripts Mall Basic B2B Script 2.0.9 has has directory traversal via a direct request for a listing of an image directory such as an uploads/ directory.
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Analysis
by VulDB Data Team • 08/03/2023
The vulnerability identified as CVE-2018-20646 affects PHP Scripts Mall Basic B2B Script version 2.0.9, representing a directory traversal flaw that allows unauthorized access to sensitive directories within the application's file system. This type of vulnerability falls under the broader category of insecure direct object references and directory traversal attacks, which are classified as CWE-22 in the Common Weakness Enumeration system. The flaw manifests when an attacker can manipulate file path parameters to access files outside the intended directory structure, specifically targeting image upload directories such as uploads/.
The technical implementation of this vulnerability stems from inadequate input validation and sanitization within the script's file handling mechanisms. When the application processes requests for directory listings, it fails to properly validate or sanitize user-supplied input that specifies directory paths. This allows malicious actors to craft requests that traverse the file system hierarchy using sequences such as ../ or ..\ to move up directory levels and access restricted content. The vulnerability specifically impacts the script's ability to enforce proper access controls, enabling attackers to bypass intended security boundaries and potentially gain access to sensitive files, configuration data, or even system files that should remain protected from direct web access.
The operational impact of this vulnerability extends beyond simple information disclosure, as it can enable attackers to access not only image files but potentially other sensitive data stored within the application's directory structure. An attacker could leverage this flaw to enumerate directory contents, access configuration files that might contain database credentials, or even retrieve executable files that could lead to further exploitation. The vulnerability's presence in a B2B script environment increases the risk profile significantly, as such applications often handle business-critical data and may contain proprietary information, customer data, or financial records that could be compromised. The attack vector is particularly concerning because it requires only a direct web request, making it easily exploitable through standard web browsing tools or automated scanning utilities.
Mitigation strategies for this vulnerability should focus on implementing proper input validation and sanitization measures at all points where user input influences file system operations. The recommended approach includes implementing strict path validation that ensures all file paths are resolved within the intended directory boundaries and rejecting any requests that attempt to traverse above the allowed directory levels. Organizations should implement proper access controls and authentication mechanisms to ensure that only authorized users can access directory listing features. Additionally, the application should employ proper file access controls and ensure that sensitive directories are not directly accessible through web requests. This vulnerability aligns with ATT&CK technique T1083 (File and Directory Discovery) and represents a critical weakness in the application's security posture that requires immediate remediation to prevent potential data breaches or system compromise. The implementation of secure coding practices and regular security testing can help prevent similar vulnerabilities from emerging in future versions of the software.