CVE-2019-7936 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 modify content block titles 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-2019-7936 represents a critical security flaw in the Magento e-commerce platform that affects multiple version ranges 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 resides within the admin panel functionality where content block titles can be modified by authenticated users, creating a persistent XSS attack vector that allows malicious code execution in the context of the victim's browser. The flaw is categorized under CWE-79 as a classic cross-site scripting vulnerability where user-supplied data is not properly sanitized before being rendered back to users. The vulnerability stems from insufficient input validation and output encoding mechanisms within the admin interface, specifically when processing content block title modifications. Attackers with authenticated access to the admin panel can exploit this weakness by injecting malicious javascript payloads into content block titles, which then get executed whenever other administrators or users view these modified content blocks. This creates a persistent threat where malicious code remains active until the affected content is removed or the vulnerability is patched. The operational impact of this vulnerability is significant as it allows for session hijacking, credential theft, and potential lateral movement within the Magento environment, particularly since the affected users typically possess elevated privileges within the system. The attack surface is widened by the fact that these modifications can be made through legitimate administrative functions, making the exploitation less detectable compared to other attack vectors. This vulnerability aligns with ATT&CK technique T1059.007 for command and scripting interpreter and T1566.001 for credential access through phishing, as it enables attackers to establish persistent access and potentially escalate privileges. The security implications extend beyond simple script execution to include potential data exfiltration and system compromise, especially when administrators interact with compromised content blocks. Organizations running affected Magento versions face substantial risk of unauthorized access and data breaches, as the vulnerability enables attackers to execute arbitrary code in the context of authenticated users, potentially leading to full system compromise. The vulnerability's persistence stems from the stored nature of the XSS payload, which remains active in the database until manually removed or patched. This makes it particularly dangerous for environments where multiple administrators access the same content management interface, as any one of them could be compromised when viewing affected content blocks. The exploitation requires only basic authentication credentials to the Magento admin panel, making it accessible to attackers who have gained initial access through other means such as credential theft or compromised accounts. Security teams should prioritize patching affected systems immediately, as the vulnerability provides a straightforward path to persistent access within the Magento environment. The recommended mitigation strategy involves applying the vendor patches released for each affected version, implementing additional input validation measures, and monitoring for suspicious administrative activities that could indicate exploitation attempts. Organizations should also consider implementing web application firewalls and additional security controls to detect and prevent unauthorized modifications to content blocks, particularly those that might be used for XSS attacks.