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A critical vulnerability exists in Apache Druid through version 34.0.0 affecting the Kerberos authenticator. If the configuration parameter 'druid.auth.authenticator.kerberos.cookieSignatureSecret' is not explicitly set, Druid generates a fallback secret using ThreadLocalRandom, which is not cryptographically secure. This weak secret can be predicted or brute-forced by attackers, enabling authentication cookie forgery and potential authentication bypass. Furthermore, each process generates its own fallback secret, leading to inconsistent secrets across nodes and causing authentication failures in distributed or multi-broker deployments.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos.
This repository contains a proof-of-concept (POC) exploit for CVE-2025-59390, a vulnerability in Apache Druid (through version 34.0.0) where the Kerberos authenticator uses a weak fallback secret for signing authentication cookies if the 'druid.auth.authenticator.kerberos.cookieSignatureSecret' configuration is not set. The fallback secret is generated using Java's ThreadLocalRandom, which is not cryptographically secure. The provided C++ code ('ThreadLocalRandom Inverse POC') demonstrates how to invert the ThreadLocalRandom's mix32 function to recover the original seed (fallback secret) from observed outputs. By recovering this secret, an attacker could forge authentication tokens or bypass authentication. The repository structure is simple, consisting of a README explaining the vulnerability and a single C++ file implementing the cryptanalytic attack. No hardcoded network endpoints are present, but the attack targets the Kerberos authentication mechanism over the network.
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