CVE-2019-7939 in Magento
Summary
by MITRE
A reflected cross-site scripting vulnerability exists on the customer cart checkout page 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 sending a victim a crafted URL that results in malicious javascript execution in the victim's browser.
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Analysis
by VulDB Data Team • 07/20/2020
The reflected cross-site scripting vulnerability identified as CVE-2019-7939 represents a critical security flaw in Magento e-commerce platforms that affects multiple version ranges including Magento 2.1 before 2.1.18, Magento 2.2 before 2.2.9, and Magento 2.3 before 2.3.2. This vulnerability specifically targets the customer cart checkout page, making it particularly dangerous for online retailers and their customers who engage in purchasing activities through the affected platform. The flaw enables attackers to inject malicious javascript code that executes within the victim's browser when they access a specially crafted URL, creating a persistent threat vector that can compromise user sessions and data integrity.
The technical implementation of this vulnerability stems from inadequate input validation and output encoding within the checkout page processing logic. When users navigate to the cart checkout page, the application fails to properly sanitize user-supplied parameters that are reflected back in the HTTP response without adequate escaping or encoding mechanisms. This allows an attacker to craft malicious URLs containing javascript payloads that, when clicked by an unsuspecting user, execute within the context of the victim's browser session. The reflected nature of the vulnerability means that the malicious script is not stored on the server but is instead reflected back to the user through the application's response, making it particularly challenging to detect and prevent through traditional server-side security measures.
The operational impact of this vulnerability extends beyond simple script execution, as it can enable sophisticated attack vectors including session hijacking, credential theft, and data exfiltration. Attackers can leverage this vulnerability to steal customer session cookies, potentially gaining unauthorized access to user accounts and their associated personal information. The vulnerability also enables man-in-the-middle attacks where malicious actors can intercept and modify transaction data during checkout processes, leading to financial fraud and compromise of sensitive customer data. Given that the affected versions of Magento are widely deployed across e-commerce platforms, the potential attack surface for this vulnerability is substantial, affecting businesses ranging from small online stores to large enterprise retailers.
Security professionals should consider this vulnerability in the context of the CWE-79 classification for cross-site scripting flaws, which specifically addresses the improper handling of untrusted data in web applications. The ATT&CK framework categorizes this as a web application attack vector under the technique of "Cross-site Scripting" with potential for privilege escalation and data theft. Mitigation strategies should prioritize immediate patching of affected Magento installations to the latest available versions, implementation of proper input validation and output encoding mechanisms, and deployment of web application firewalls to detect and block malicious requests. Additionally, organizations should conduct comprehensive security assessments of their web applications, implement content security policies, and establish robust monitoring procedures to detect potential exploitation attempts. Regular security training for development teams on secure coding practices and input validation techniques remains essential in preventing similar vulnerabilities from emerging in future application releases.