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GHSA-qqc3-94qv-7fw3
No affected components available
Summary
When an application configures hubuum_client with ClientBuilder::with_transport, several client operations still use the built-in reqwest client directly. The bypass includes password login, bearer-token validation, authentication-provider discovery, health and readiness probes, export-output downloads, and unified-search streams.
Impact
Applications may use a custom transport as a security boundary for network isolation, proxy enforcement, request signing, audit logging, or policy checks. Affected operations bypass those controls and make direct network requests to the configured base URL. Password login can therefore send plaintext credentials outside the intended transport, while token validation can send a bearer token outside it. Other bypassing calls can evade audit and routing policy.
The issue affects custom transports introduced in 0.3.0. Applications that do not configure a custom transport are not affected by the bypass.
Defense in depth
The same private fix disables redirect following for built-in async and blocking clients so an authenticated request remains at the endpoint validated and constructed by the client. Applications supplying a preconfigured reqwest client continue to control its redirect policy.
Remediation
The proposed fix routes authentication, public discovery and probe calls, export downloads, unified-search streams, raw requests, and typed requests through the configured transport in both async and blocking clients. It preserves retry and error-body policies, documents the buffering semantics of custom transports, and surfaces built-in-client redirects as 3xx API errors.
Validation
Regression tests assert async and blocking routing, paths, login bodies, bearer headers, streaming bodies, retries, error handling, and redirect behavior. Formatting, Clippy with warnings denied, rustdoc warnings, the complete workspace suite, all supported feature combinations, Rust 1.88 MSRV, OpenAPI validation, and the combined library plus downstream-consumer integration suites pass against the immutable Hubuum 0.0.3 image.
The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability.
Limited exploitation activity has been observed. Close monitoring and planned remediation are recommended.
Probability that this vulnerability will be exploited in the wild within the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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