CVE-2023-40626 in Joomla
Summary
by MITRE • 11/29/2023
The language file parsing process could be manipulated to expose environment variables. Environment variables might contain sensible information.
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Analysis
by VulDB Data Team • 12/20/2023
The vulnerability identified as CVE-2023-40626 represents a critical weakness in how applications handle language file parsing operations, specifically exposing sensitive environment variables through improper input validation. This flaw exists within the application's localization or internationalization framework where language files are processed to determine user interface text and other localized content. The vulnerability arises when the system fails to properly sanitize or validate language file inputs, allowing malicious actors to manipulate the parsing process and extract environment variables that may contain authentication tokens, database credentials, API keys, or other confidential information. The issue is particularly concerning because environment variables are commonly used to store runtime configuration data and security-sensitive parameters that should remain isolated from user-facing components.
This vulnerability falls under the broader category of information exposure through manipulation of input processing mechanisms and can be classified as a variant of CWE-200 - Information Exposure. The technical implementation flaw occurs during the language file parsing phase where the application's configuration parser does not adequately separate user-controlled input from system-level environment variable access. When an attacker can influence how language files are processed, they may be able to construct malicious inputs that trigger the system to output environment variable contents through error messages, debug information, or direct variable interpolation. The parsing process itself becomes a vector for information leakage, as the system fails to implement proper input validation, sanitization, or access control measures that would normally prevent such exposure.
The operational impact of CVE-2023-40626 extends beyond simple information disclosure, as the leaked environment variables can provide attackers with substantial access privileges and system insights. If the exposed environment variables contain database connection strings, cloud service credentials, or cryptographic keys, attackers can leverage this information to gain unauthorized access to backend systems, compromise database integrity, or escalate privileges within the application environment. The vulnerability creates a persistent threat vector that remains active as long as the affected application continues to process language files, making it particularly dangerous for long-running applications or those with frequent localization updates. This exposure can lead to cascading security incidents where initial information disclosure enables further exploitation through techniques such as credential harvesting, service account compromise, or lateral movement within network environments.
Mitigation strategies for CVE-2023-40626 should focus on implementing robust input validation and sanitization measures within the language file parsing process. Organizations should ensure that all language file inputs are properly validated against known good patterns and that environment variable access is strictly controlled through proper access control lists and privilege separation mechanisms. The implementation of secure coding practices including parameterized input handling, environment variable isolation, and proper error message formatting can significantly reduce the attack surface. Security controls should also include regular auditing of language file processing components, monitoring for anomalous parsing behavior, and implementing principle of least privilege access for environment variables. From an ATT&CK framework perspective, this vulnerability maps to T1566 - Phishing and T1078 - Valid Accounts, as attackers can use the leaked credentials to establish persistent access. Additionally, the mitigation approach should align with NIST SP 800-53 security controls including SI-7 - System and Information Integrity and SC-28 - Protection of Data at Rest, to ensure comprehensive defense against information exposure threats.