CVE-2019-7937 in Magento
Summary
by MITRE
A stored cross-site scripting vulnerability exists in the admin panel of Magento 2.1 prior to 2.1.18, Magento 2.2 prior to 2.2.9, Magento 2.3 prior to 2.3.2. This could be exploited by an authenticated user with privileges to store product attributes to inject malicious javascript.
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Analysis
by VulDB Data Team • 07/20/2020
The stored cross-site scripting vulnerability identified as CVE-2019-7937 represents a critical security flaw in Magento e-commerce platforms that affects multiple versions including Magento 2.1 prior to 2.1.18, Magento 2.2 prior to 2.2.9, and Magento 2.3 prior to 2.3.2. This vulnerability specifically targets the admin panel functionality and exploits the lack of proper input sanitization when processing product attribute data. The flaw allows authenticated users with sufficient privileges to store product attributes to inject malicious javascript code that persists in the system and can be executed when other users access the affected pages. This type of vulnerability falls under CWE-79 which specifically addresses cross-site scripting flaws where untrusted data is improperly integrated into web pages without adequate validation or escaping mechanisms. The vulnerability operates through the administrative interface where product attributes are managed, creating a persistent threat that can affect any user who views the compromised product information within the admin panel.
The technical exploitation of this vulnerability requires an authenticated attacker who possesses the necessary permissions to modify product attributes within the Magento admin panel. Once the malicious javascript code is stored in the product attribute fields, it becomes persistent and executes whenever the affected product information is displayed in the admin interface. This creates a dangerous scenario where legitimate administrators or other authorized users may unknowingly execute malicious code when viewing product details, potentially leading to session hijacking, credential theft, or further system compromise. The stored nature of this XSS vulnerability means that the malicious payload remains active even after the initial injection, making it particularly dangerous as it can affect multiple users over time. The vulnerability demonstrates poor input validation practices where user-supplied data containing javascript code is directly stored and rendered without proper sanitization or encoding, violating fundamental web application security principles and creating a persistent backdoor for attackers.
The operational impact of CVE-2019-7937 extends beyond simple script execution as it provides attackers with potential access to sensitive administrative functions and user data. When legitimate users access the compromised product information, they may unknowingly execute malicious javascript that can perform actions such as stealing cookies, redirecting to malicious sites, or even modifying system configurations. This vulnerability can be leveraged for privilege escalation attacks where attackers might gain access to additional administrative functions or extract sensitive information from the application's session management. The attack vector is particularly concerning because it requires minimal privileges to exploit, as the attacker only needs the ability to modify product attributes, which many e-commerce administrators might grant to trusted third-party vendors or content managers. The vulnerability creates a persistent threat that can be used to maintain long-term access to the system, making it a significant concern for organizations relying on Magento platforms for their online commerce operations.
Organizations affected by CVE-2019-7937 should immediately implement the recommended security patches provided by Magento for the affected versions, specifically upgrading to Magento 2.1.18, 2.2.9, or 2.3.2 respectively. Additionally, administrators should conduct thorough security reviews of all product attribute data that has been stored since the vulnerability was introduced, as any malicious code injected prior to patching remains active. Network monitoring should be enhanced to detect suspicious activities related to product attribute modifications, and access controls should be reviewed to ensure that only authorized personnel have the ability to modify product data. The implementation of Content Security Policy headers can provide an additional layer of protection against XSS attacks by restricting the sources from which scripts can be executed within the application. Security teams should also consider implementing automated scanning tools to identify and remediate similar vulnerabilities in other applications within their environment, as this type of flaw often indicates broader security issues in web application development practices. Organizations should follow ATT&CK framework guidance for defending against credential access and privilege escalation techniques that may be facilitated by this vulnerability, particularly focusing on the persistence and privilege escalation tactics that attackers might employ through stored XSS exploitation.