CVE-2019-19684 in nopCommerce
Summary
by MITRE
nopCommerce v4.2.0 allows privilege escalation via file upload in Presentation/Nop.Web/Admin/Areas/Controllers/PluginController.cs via Admin/FacebookAuthentication/Configure because it is possible to upload a crafted Facebook Auth plugin.
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Analysis
by VulDB Data Team • 12/10/2019
The vulnerability CVE-2019-19684 affects nopCommerce version 4.2.0 and represents a critical privilege escalation flaw that stems from inadequate file upload validation within the administrative plugin management system. This vulnerability exists in the Presentation/Nop.Web/Admin/Areas/Controllers/PluginController.cs file where the application fails to properly validate file types during plugin upload operations. The specific pathway for exploitation occurs through the Admin/FacebookAuthentication/Configure endpoint, which allows attackers to upload maliciously crafted Facebook authentication plugins that can execute arbitrary code on the target system.
The technical implementation of this vulnerability demonstrates a classic insecure file upload flaw that aligns with CWE-434, which describes the improper restriction of uploads of file with dangerous types. The vulnerability occurs because the application does not properly validate the file extensions, content types, or file headers of uploaded plugins, allowing attackers to bypass security controls and upload malicious assemblies or scripts. When an administrator accesses the Facebook Authentication configuration page, the system processes the uploaded plugin without sufficient sanitization, creating a path for remote code execution and privilege escalation.
The operational impact of this vulnerability is severe as it provides attackers with the ability to escalate privileges from a standard user account to administrative level access within the nopCommerce system. Once successfully exploited, the attacker can gain complete control over the web application, including access to customer data, product information, payment processing capabilities, and administrative functions. The vulnerability affects the entire administrative interface of the application, making it particularly dangerous for e-commerce platforms that rely on nopCommerce for their online retail operations.
Mitigation strategies for CVE-2019-19684 should include immediate patching of the nopCommerce application to version 4.2.1 or later, which contains the necessary security fixes. Organizations should also implement additional defensive measures such as restricting file upload capabilities to specific trusted administrators, implementing strict file type validation with whitelisting approaches, and monitoring administrative access logs for suspicious activities. The ATT&CK framework categorizes this vulnerability under T1078 Valid Accounts and T1505 Server Software Component, as it leverages legitimate administrative functions to gain elevated privileges. Network segmentation and application firewalls should be deployed to limit access to administrative endpoints, while regular security audits should verify that all uploaded files are properly validated and sanitized before being processed by the application.