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https://issues.apache.org/jira/browse/CAMEL-24730?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Claus Ibsen resolved CAMEL-24730.
---------------------------------
Resolution: Fixed
> camel-spiffe - do not let inbound headers choose the operation or the
> validated audience
> ----------------------------------------------------------------------------------------
>
> Key: CAMEL-24730
> URL: https://issues.apache.org/jira/browse/CAMEL-24730
> Project: Camel
> Issue Type: Bug
> Reporter: Andrea Cosentino
> Assignee: Andrea Cosentino
> Priority: Major
> Fix For: 4.23.0
>
>
> h2. Problem
> {{SpiffeProducer}} reads two security-relevant inputs from the message *in
> preference to* the endpoint configuration:
> {code:java}
> private SpiffeOperation determineOperation(Exchange exchange) {
> SpiffeOperation operation =
> exchange.getIn().getHeader(SpiffeConstants.OPERATION, SpiffeOperation.class);
> return operation != null ? operation :
> getEndpoint().getConfiguration().getOperation();
> }
> private String[] resolveAudiences(Exchange exchange) {
> String audience = exchange.getIn().getHeader(SpiffeConstants.AUDIENCE,
> String.class);
> if (ObjectHelper.isEmpty(audience)) {
> audience = getEndpoint().getConfiguration().getAudience();
> }
> ...
> }
> {code}
> Both were reproduced against a route configured as a validator
> ({{operation=validateJwtSvid&audience=spiffe://example.org/my-service}}) with
> a mocked {{WorkloadApiClient}}:
> {noformat}
> configured audience = spiffe://example.org/my-service
> VALIDATED AGAINST = spiffe://example.org/ATTACKER-CHOICE <-
> CamelSpiffeAudience wins
> OPERATION FLIPPED TO MINT = true <- body =
> minted token
>
> validateJwtSvid never called
> {noformat}
> h3. (a) The audience is the check, not a parameter
> For {{validateJwtSvid}} the audience is what binds the token to *this*
> service - it is the {{aud}} claim check. Letting the message pick it means a
> JWT-SVID minted for a different workload validates successfully, and the
> route then treats the caller as authenticated. This is the same shape as
> CAMEL-24281 / CVE-2026-66908, where platform-http-main did not enforce
> {{iss}}/{{aud}}.
> Note this is specific to *validation*. For {{fetchJwtSvid}} the audience is a
> genuine per-message parameter ("mint me a token for X") and the header
> override there is correct.
> h3. (b) A validator can be turned into a minter
> {{CamelSpiffeOperation: fetchJwtSvid}} against an endpoint configured for
> {{validateJwtSvid}} makes the workload mint and return *its own* JWT-SVID to
> the caller - an identity-credential disclosure, not just a bypass.
> h2. Severity and reachability
> This is *defense in depth*, not a reachable-by-default vulnerability: per the
> Camel security model external senders are untrusted, but a well-behaved
> consumer applies a {{HeaderFilterStrategy}} that blocks {{Camel*}} headers,
> so the obvious HTTP path is already closed. It matters because the
> component's entire purpose is workload identity, and because the sibling
> component already takes the opposite - and safer - position:
> {quote}
> The path is taken from the endpoint only: it is deliberately not overridable
> by a message header, so an inbound message cannot pick which policy judges
> it. -- {{OpaEndpoint#policyPath}}
> {quote}
> {{camel-opa}} pins its policy path for exactly this reason. {{camel-spiffe}}
> should be consistent.
> h2. Proposal
> Pin the security-critical inputs, keep the benign override:
> * {{validateJwtSvid}} uses the *configured* audience only;
> {{CamelSpiffeAudience}} is ignored for that operation (and the javadoc/docs
> say so). {{fetchJwtSvid}} keeps the header.
> * Add an {{allowOperationHeader}} option, default {{false}}, gating
> {{CamelSpiffeOperation}}. Existing routes that rely on the header opt in
> explicitly.
> * Add a Security notes section to {{spiffe-component.adoc}}, mirroring the
> one in {{opa-component.adoc}}, recommending {{removeHeaders("CamelSpiffe*")}}
> on untrusted ingress.
> Tests must cover both directions: the header being ignored where it is
> pinned, and still honoured where it is legitimate.
> h2. Scope
> {{main}} only. {{camel-spiffe}} is new in the unreleased 4.23.0, so no
> released version is affected and no security advisory is needed; the
> {{allowOperationHeader}} default can be chosen freely.
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