CVE-2022-29266 in APISIX
Summary
by MITRE • 04/20/2022
In APache APISIX before 3.13.1, the jwt-auth plugin has a security issue that leaks the user's secret key because the error message returned from the dependency lua-resty-jwt contains sensitive information.
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Analysis
by VulDB Data Team • 04/27/2022
The vulnerability identified as CVE-2022-29266 affects Apache APISIX versions prior to 3.13.1 and specifically targets the jwt-auth plugin implementation. This security flaw represents a critical information disclosure vulnerability that occurs when the plugin processes authentication requests and encounters errors during JWT validation. The issue stems from the improper handling of error messages within the lua-resty-jwt dependency, which is a core component responsible for JSON Web Token processing in the APISIX environment. When authentication fails, the system returns error messages that inadvertently expose sensitive user secret keys, creating a significant risk for systems relying on this authentication mechanism.
The technical root cause of this vulnerability lies in the error message generation logic within the jwt-auth plugin's interaction with the lua-resty-jwt library. When a JWT validation fails, the system should provide generic error responses that do not reveal internal implementation details or sensitive data. However, in affected versions, the error handling mechanism fails to sanitize the output, resulting in the leakage of user secret keys through error messages. This behavior directly violates security best practices for error handling and information disclosure prevention. The vulnerability is categorized under CWE-209, which specifically addresses "Information Exposure Through an Error Message," and aligns with ATT&CK technique T1566.001 for credential access through the exploitation of information disclosure vulnerabilities.
The operational impact of this vulnerability extends beyond simple information leakage, as it provides attackers with the means to compromise user authentication credentials and potentially gain unauthorized access to protected resources. Attackers can exploit this vulnerability by crafting malicious JWT tokens that will trigger the error condition, thereby extracting secret keys from the error responses. This compromise undermines the entire authentication framework, as the secret keys can then be used to generate valid JWT tokens for unauthorized access to services protected by APISIX. The vulnerability affects organizations using APISIX as an API gateway where JWT-based authentication is implemented, potentially exposing thousands of users' credentials if not properly addressed. The risk is particularly severe in environments where APISIX serves as a critical authentication layer for microservices architectures or API management platforms.
Organizations should immediately upgrade to Apache APISIX version 3.13.1 or later to remediate this vulnerability. The upgrade process should include comprehensive testing to ensure that existing JWT-based authentication workflows continue to function correctly. Additionally, security teams should implement monitoring for error message patterns that might indicate exploitation attempts, particularly focusing on unusual error responses containing cryptographic material. Network segmentation and access controls should be reviewed to limit exposure, while certificate rotation procedures should be implemented for any compromised secret keys. The fix implemented in version 3.13.1 addresses the root cause by ensuring that error messages do not contain sensitive information, thereby preventing the leakage of user secret keys during authentication failures. Organizations should also consider implementing additional logging and alerting mechanisms to detect potential exploitation attempts and maintain audit trails for security investigations.