CVE-2016-10704 in Community Edition
Summary
by MITRE
Magento Community Edition and Enterprise Edition before 2.0.10 and 2.1.x before 2.1.2 have XSS via e-mail templates that are mishandled during a preview, aka APPSEC-1503.
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Analysis
by VulDB Data Team • 12/18/2019
This vulnerability affects Magento Community Edition and Enterprise Edition versions prior to 2.0.10 and 2.1.x versions prior to 2.1.2, specifically targeting email template handling during preview operations. The flaw represents a cross-site scripting vulnerability that occurs when email templates containing malicious scripts are processed through the preview functionality. This issue was categorized as APPSEC-1503 by Magento's security team, highlighting the critical nature of email template injection attacks in e-commerce platforms. The vulnerability stems from inadequate input sanitization and output encoding of template variables when rendered in preview mode, allowing attackers to inject malicious javascript code that executes in the context of administrators or users who preview these templates.
The technical implementation of this vulnerability exploits the way Magento processes email template variables during preview operations. When administrators or users access the preview functionality for email templates, the system fails to properly sanitize user-supplied content that may contain script tags or other malicious payloads. This occurs because the preview mechanism directly renders template variables without adequate context-aware encoding, creating an environment where attacker-controlled data can be executed as javascript code. The vulnerability is particularly dangerous because email templates are often edited by privileged users with administrative access, making the attack surface more significant than typical XSS scenarios. This flaw aligns with CWE-79 Cross-site Scripting and follows the ATT&CK technique T1213.002 for credential access through web application vulnerabilities.
The operational impact of this vulnerability extends beyond simple script execution, as it can lead to complete administrative compromise of Magento installations. Attackers can leverage this vulnerability to steal administrator sessions, modify email templates to redirect users to malicious sites, or inject persistent backdoors into the email system. The preview functionality typically requires elevated privileges to access, making successful exploitation particularly damaging as it can provide attackers with the ability to manipulate the entire email communication infrastructure. This vulnerability also poses risks to customer data integrity, as attackers can modify email content to include phishing elements or malicious links that could compromise customer accounts. The attack chain typically involves crafting malicious template content, uploading it through the admin interface, and then triggering the preview functionality to execute the payload. Organizations using affected Magento versions face potential data breaches, reputational damage, and regulatory compliance violations due to the exposure of sensitive customer information through compromised email systems.
The recommended mitigation strategy involves immediate patching of affected Magento installations to versions 2.0.10 or 2.1.2 and later, which contain the necessary input validation and output encoding fixes. Administrators should also implement additional security measures including strict template validation policies, regular security audits of email templates, and monitoring of preview functionality access logs. Network segmentation and access controls should be enforced to limit who can access the email template preview features. Security teams should also consider implementing web application firewalls with rules specifically designed to detect and block XSS patterns in email template content. Organizations should conduct thorough vulnerability assessments to ensure all Magento installations are updated and monitor for any signs of exploitation attempts. The fix addresses the root cause by implementing proper context-aware encoding of template variables during preview operations and establishing stricter input validation for all user-supplied template content.