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CVE-2024-38820 is a Spring Framework vulnerability in DataBinder field protection logic. A prior fix for CVE-2022-22968 changed disallowedFields pattern handling to be case-insensitive, but the implementation relied on String.toLowerCase(). Because Java case conversion is locale-dependent, certain locale-specific mappings can cause field-name comparisons to behave unexpectedly. As a result, fields intended to be blocked by DataBinder disallowedFields may fail to match as expected, allowing otherwise disallowed request parameters to be bound. The issue affects applications that depend on disallowedFields as a security control for restricting mass assignment or sensitive property binding.
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This repository is a comprehensive proof-of-concept (PoC) for CVE-2024-38820, a vulnerability in the Spring Framework's DataBinder component. The vulnerability arises from locale-dependent behavior of Java's String.toLowerCase() method, which can be exploited in locales such as Turkish (tr_TR) to bypass the disallowedFields protection mechanism. The repository contains a Spring Boot application (Java) with controllers that demonstrate the vulnerability, a model with a protected field (adminId), and configuration files to set the locale. The main exploit is performed by sending HTTP GET requests to the /user endpoint with parameter names that, due to locale-specific case conversion, are not properly blocked by the DataBinder. The included Bash script (test-cve-2024-38820.sh) automates the exploitation and verification process. The PoC confirms that, in a Turkish locale, using parameter names like ADMINID or ADMİNID allows an attacker to set the protected adminId field, potentially leading to privilege escalation. The repository is well-documented, with detailed explanations, test cases, and mitigation advice. No fake or destructive code is present; the exploit is a legitimate demonstration of the vulnerability.
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Vulnerability in the external Spring framework affecting Adobe Experience Manager Forms that could allow unauthorized access to sensitive data.
A vulnerability in the Spring dependency affecting Adobe Experience Manager Forms on JEE that could lead to a case sensitive match exception.
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