CVE-2022-43691 in Concrete
Summary
by MITRE • 11/15/2022
Concrete CMS (formerly concrete5) below 8.5.10 and between 9.0.0 and 9.1.2 inadvertently disclose server-side sensitive information (secrets in environment variables and server information) when Debug Mode is left on in production.
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Analysis
by VulDB Data Team • 05/01/2025
Concrete CMS vulnerability CVE-2022-43691 represents a critical information disclosure flaw that arises from improper configuration management in the content management system. This vulnerability specifically affects versions prior to 8.5.10 and within the 9.0.0 to 9.1.2 range, where debug mode remains enabled in production environments. The flaw stems from the application's failure to properly sanitize output when debug mode is active, leading to exposure of sensitive server-side information including environment variables that may contain database credentials, API keys, and other confidential data. This represents a direct violation of security principle #10 from the OWASP Top Ten 2017, which addresses information leakage, and aligns with CWE-200, which categorizes improper information exposure. The vulnerability is particularly dangerous because it allows attackers to gain insights into the underlying infrastructure and potentially extract credentials that could be used for further exploitation.
The technical implementation of this vulnerability occurs through the application's debug output mechanisms that are designed for development environments but are inadvertently left active in production systems. When debug mode is enabled, the system logs and displays detailed information about the server configuration, including PHP environment variables, database connection strings, and potentially other sensitive configuration parameters. This information disclosure can occur through various application endpoints that are meant to provide debugging information to developers but fail to properly restrict access in production deployments. The vulnerability is classified under ATT&CK technique T1212, which describes exploitation of information disclosure vulnerabilities to gain access to sensitive data, and represents a classic case of insecure configuration management that violates security best practices.
The operational impact of this vulnerability extends beyond simple information disclosure, as it creates a significant attack surface that can be leveraged for subsequent exploitation attempts. Attackers who discover exposed environment variables can potentially use database credentials to directly access backend databases, or utilize API keys to make unauthorized calls to external services. The exposure of server information such as operating system details, PHP configuration, and application version information provides attackers with valuable reconnaissance data that can be used to identify other potential vulnerabilities in the system. This vulnerability particularly affects organizations that follow the principle of least privilege in their deployment configurations but fail to properly disable debug mode in production environments, creating an implicit trust model that exposes sensitive data to unauthorized parties.
Mitigation strategies for CVE-2022-43691 require immediate configuration changes to disable debug mode in production environments and implement proper access controls for debugging features. Organizations should establish mandatory security configuration reviews that include verification of debug mode status in production deployments, as outlined in NIST SP 800-53 controls for configuration management. The recommended approach involves implementing automated deployment checks that validate debug mode status and disable it automatically in production environments, while also ensuring that sensitive environment variables are properly managed through secure configuration management systems. Additionally, organizations should implement network segmentation and access controls to limit exposure of debugging endpoints even when debug mode is enabled in development environments. Regular security audits should verify that debug mode is only enabled in controlled development environments and that sensitive information is not exposed through application logs or error messages, aligning with the security controls specified in ISO/IEC 27001 and the security configuration guidelines from the Center for Internet Security.