CVE-2021-36032 in Magento Commerce
Summary
by MITRE • 09/01/2021
Magento Commerce versions 2.4.2 (and earlier), 2.4.2-p1 (and earlier) and 2.3.7 (and earlier) are affected by an improper input validation vulnerability. An authenticated attacker can trigger an insecure direct object reference in the `V1/customers/me` endpoint to achieve information exposure and privilege escalation.
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Analysis
by VulDB Data Team • 09/04/2021
The vulnerability identified as CVE-2021-36032 represents a critical security flaw in Magento Commerce platforms that affects multiple version ranges including 2.4.2 and earlier, 2.4.2-p1 and earlier, and 2.3.7 and earlier. This issue manifests as an improper input validation vulnerability that specifically targets the V1/customers/me endpoint within the application's API interface. The vulnerability stems from inadequate validation mechanisms that fail to properly verify user inputs before processing them within the system's object reference mechanisms.
The technical flaw exploited in this vulnerability constitutes an insecure direct object reference (IDOR) condition that allows authenticated attackers to manipulate API requests and gain unauthorized access to customer data. When an attacker makes a request to the V1/customers/me endpoint, the system fails to properly validate whether the requesting user has legitimate authorization to access the specified customer resource. This validation failure enables attackers to reference objects they should not be permitted to access, effectively bypassing normal access controls and authorization checks that should normally protect customer information.
The operational impact of this vulnerability extends beyond simple information exposure to include potential privilege escalation capabilities that can significantly compromise system security. An authenticated attacker who successfully exploits this vulnerability can not only access sensitive customer data but may also be able to manipulate customer records, potentially leading to data corruption, unauthorized modifications, or even complete account takeovers. The vulnerability affects the core customer management functionality of the platform, making it particularly dangerous for e-commerce environments where customer data protection is paramount.
This vulnerability aligns with CWE-284, which addresses improper access control issues, and demonstrates characteristics consistent with ATT&CK technique T1078 for valid accounts and T1566 for credential harvesting. The flaw represents a fundamental breakdown in the application's security model where proper authorization checks are bypassed through manipulation of API endpoints. Organizations using affected Magento versions face significant risk of customer data breaches and potential regulatory violations under data protection frameworks such as GDPR or CCPA, particularly since the vulnerability allows for unauthorized access to personal customer information through authenticated API interactions.
Mitigation strategies for this vulnerability require immediate patching of affected Magento installations to the latest supported versions that contain the necessary security fixes. Organizations should also implement additional monitoring of API access patterns to detect anomalous requests to customer endpoints, particularly those that attempt to access customer resources outside of normal user behavior. Network segmentation and API rate limiting can help reduce the potential impact of exploitation attempts, while comprehensive access control reviews should be conducted to ensure proper authorization mechanisms are in place. Security teams should also consider implementing automated vulnerability scanning tools that can detect similar IDOR patterns in custom applications built on top of Magento platforms.