CVE-2021-37709 in Shopware
Summary
by MITRE • 08/17/2021
Shopware is an open source eCommerce platform. Versions prior to 6.4.3.1 contain a vulnerability involving an insecure direct object reference of log files of the Import/Export feature. Version 6.4.3.1 contains a patch. As workarounds for older versions of 6.1, 6.2, and 6.3, corresponding security measures are also available via a plugin.
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 08/19/2021
The vulnerability identified as CVE-2021-37709 affects Shopware eCommerce platforms prior to version 6.4.3.1, specifically targeting the Import/Export feature's log file handling mechanism. This represents a critical security flaw that exposes sensitive operational data to unauthorized access. The vulnerability stems from improper access control measures within the platform's logging infrastructure, allowing attackers to directly reference and access log files through predictable URL patterns or parameter manipulation. The insecure direct object reference (IDOR) condition creates a pathway for malicious actors to bypass normal authorization checks and retrieve potentially sensitive information from the system's import and export operations.
Shopware's Import/Export functionality generates detailed log files that contain operational metadata, including user actions, system events, and potentially sensitive data processing information. These logs often contain information about file uploads, data transformations, and user activities that could reveal system architecture details, user behavior patterns, or even partial data contents. When the platform fails to properly validate access requests for these log files, it creates an opportunity for attackers to enumerate and access files that should remain restricted to authorized administrative users. The vulnerability specifically impacts versions 6.1, 6.2, and 6.3, where the access control mechanisms were insufficient to prevent unauthorized log file retrieval.
The operational impact of this vulnerability extends beyond simple information disclosure, as the retrieved log files may contain sensitive system information that could aid in subsequent attack phases. Attackers could potentially use the exposed log data to identify system configurations, user credentials, or operational patterns that would facilitate more sophisticated attacks. The vulnerability also represents a deviation from security best practices as outlined in the OWASP Top Ten, specifically addressing the issue of insufficient logging and monitoring capabilities. From an ATT&CK framework perspective, this vulnerability enables the initial access and reconnaissance phases by providing attackers with valuable information about the target system's operational environment.
Organizations utilizing affected Shopware versions should immediately implement the official patch available in version 6.4.3.1, which addresses the underlying IDOR vulnerability through proper access control validation. For those unable to upgrade immediately, the platform provides specific workaround solutions through security plugins designed to mitigate the vulnerability in versions 6.1, 6.2, and 6.3. These workarounds typically involve implementing additional access controls and request validation mechanisms that prevent direct object references to log files. The vulnerability aligns with CWE-284, which categorizes insecure direct object references as a weakness that allows unauthorized access to resources. Security teams should also consider implementing additional monitoring of access patterns to log files as a detection mechanism for potential exploitation attempts.