Undertow ProxyProtocolReadListener Vulnerability

CVE-2024-7885

Summary

A notable vulnerability exists in the Undertow HTTP server related to the handling of multiple requests over the same HTTP connection. The issue stemmed from the misuse of a shared StringBuilder instance within the ProxyProtocolReadListener, specifically during the process of handling requests in the parseProxyProtocolV1 method. This flaw can lead to information leakage, where sensitive data from a preceding request may be inadvertently included in a subsequent response. The consequence is not only potential data exposure but also issues with connection stability, as errors may arise during processing, affecting overall application performance in environments that handle multiple requests concurrently.

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