CVE-2019-7868 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 can be exploited by an authenticated user with permissions to manage tax rules.
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Analysis
by VulDB Data Team • 07/19/2020
This vulnerability represents a critical stored cross-site scripting flaw that affects multiple versions of the Magento e-commerce platform. The issue specifically targets the admin panel functionality where users with appropriate permissions can manipulate tax rule configurations. The vulnerability is classified under CWE-79 as a failure to sanitize user input, creating a persistent XSS attack vector that can be exploited by malicious actors who have gained administrative access to the system.
The technical implementation of this flaw occurs within the tax rule management component of Magento's administrative interface. When authenticated administrators create or modify tax rules, the application fails to properly sanitize and validate user-supplied input before storing it in the database and subsequently rendering it in subsequent web page responses. This allows an attacker with administrative privileges to inject malicious javascript code that persists in the system and executes whenever other users view the affected tax rule entries.
The operational impact of this vulnerability is significant as it provides attackers with a persistent foothold within the Magento environment. Since the vulnerability requires only authenticated access with tax rule management permissions, attackers who have compromised administrative credentials or gained access through other means can leverage this flaw to execute arbitrary javascript code in the context of other users' browsers. This can lead to session hijacking, data exfiltration, and further privilege escalation attacks. The stored nature of the vulnerability means that the malicious payload remains active even after the initial exploitation, continuously affecting any user who views the compromised tax rule entries.
Attackers can utilize this vulnerability to perform various malicious activities including stealing administrative sessions, redirecting users to phishing sites, modifying critical system configurations, or executing commands on behalf of the victim user. The attack chain typically begins with an attacker obtaining valid administrative credentials, followed by navigation to the tax rule management section, and finally the injection of malicious javascript code that gets stored and executed in subsequent user sessions. This vulnerability aligns with ATT&CK technique T1059.007 for command and scripting interpreter and T1566.001 for credential access through social engineering.
Organizations should immediately apply the vendor-provided patches for Magento versions 2.1.18, 2.2.9, and 2.3.2 to remediate this vulnerability. Additionally, implementing proper input validation and output encoding measures within the application's admin panel can help prevent similar issues in the future. Security monitoring should include detection of suspicious activities within tax rule management functions, and regular security audits of administrative interfaces should be conducted to identify potential input sanitization gaps. Network segmentation and privilege least-privilege principles should be enforced to limit the potential impact of successful exploitation attempts.