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CVE-2024-38820 is a field protection bypass in Spring Framework DataBinder. The fix for CVE-2022-22968 made disallowedFields pattern matching case-insensitive, but its use of String.toLowerCase() introduced locale-dependent case-conversion behavior. Under certain locale-dependent conditions, configured exclusion patterns may fail to protect intended fields, allowing unintended request parameter binding. The correction uses locale-independent lowercase conversion for both disallowedFields patterns and request parameter names.
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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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A locale-dependent weakness in DataBinder's case-insensitive disallowedFields matching can leave fields insufficiently protected. The advisory identifies affected org.springframework:spring-context packages, assigns a CVSS v3 base score of 5.3, and recommends updating to version 6.1.14 or later.
An earlier Spring Framework vulnerability referenced as background to the current issue. Its correction introduced locale-independent lowercase conversion for disallowedFields patterns and request parameter names, but the current advisory describes remaining bypass cases separately as CVE-2025-22233. This reference does not specify affected versions or exploit status for CVE-2024-38820.
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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