CVE-2020-15083 in PrestaShop
Summary
by MITRE
In PrestaShop from version 1.7.0.0 and before version 1.7.6.6, if a target sends a corrupted file, it leads to a reflected XSS. The problem is fixed in 1.7.6.6
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Analysis
by VulDB Data Team • 10/28/2020
The vulnerability CVE-2020-15083 affects PrestaShop e-commerce platform versions 1.7.0.0 through 1.7.6.5, representing a significant security flaw that exposes users to reflected cross-site scripting attacks. This issue stems from inadequate input validation mechanisms within the platform's file handling processes, specifically when processing corrupted or malformed files. The vulnerability creates a pathway for attackers to inject malicious scripts into web pages viewed by other users, potentially compromising user sessions and enabling unauthorized access to sensitive data.
The technical flaw manifests when PrestaShop processes file uploads or references to external resources without proper sanitization of input parameters. When a malicious user sends a corrupted file containing specially crafted script tags or malicious payloads, the platform fails to adequately filter or escape these inputs before rendering them in web responses. This reflected XSS vulnerability occurs because the application directly incorporates user-supplied data into web page content without proper context-aware escaping mechanisms. The vulnerability is classified under CWE-79 as a failure to sanitize user inputs, making it susceptible to exploitation through various attack vectors including malicious file uploads, URL parameters, or form submissions.
The operational impact of this vulnerability extends beyond simple script injection, potentially allowing attackers to hijack user sessions, steal sensitive information, or redirect victims to malicious websites. An attacker could craft a malicious file that, when processed by the vulnerable PrestaShop installation, would execute arbitrary JavaScript code in the context of other users' browsers. This could lead to session theft, data exfiltration, or the execution of unauthorized administrative commands. The reflected nature of the vulnerability means that the malicious payload is reflected back to the user through the web application's response, making it particularly dangerous in web environments where users interact with uploaded files or external resources.
Organizations running affected PrestaShop versions should immediately implement the security patch released in version 1.7.6.6, which addresses the input validation gaps and implements proper sanitization of file-related parameters. The mitigation strategy should include comprehensive input validation, output encoding, and the implementation of Content Security Policy headers to reduce the impact of potential exploitation attempts. Security practitioners should also conduct thorough vulnerability assessments of their PrestaShop installations, review file upload mechanisms, and monitor for suspicious file uploads or unusual user behavior patterns. This vulnerability aligns with ATT&CK technique T1566.001 for initial access through malicious file uploads, emphasizing the importance of robust file validation and user input sanitization in web application security.