vulnerability / NVI-00017801 / Revision 1
nebula-mesh: Host revocation is not durable - blocked/offboarded hosts can regain a valid certificate
GitHub lists this reviewed advisory for github.com/forgekeep/nebula-mesh. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.
This report has not inspected your inventory, configuration, deployed build, reachability or evidence. A catalog listing and a severity score do not establish exposure or compromise.
01 / Meaning
Why it matters
Published affected context helps an owner decide what evidence to gather. This report has not examined your application.
02 / Applicability
The affected context
Affected versions, configuration prerequisites and known exclusions are public. Confirm each one against the deployed service.
github.com/forgekeep/nebula-mesh
source listed< 0.3.7
## Summary Two related authorization gaps let a host that should no longer be trusted obtain a fresh, valid Nebula certificate, because nebula-mgmt does not re-evaluate revocation/authorization state at certificate *issuance* time — only at poll time. ## 1. Blocklist not enforced at sign / re-enroll time `internal/api/enroll.go:128` calls `caMgr.Sign(...)` without consulting the blocklist. The blocklist is only checked in the poll path (`internal/api/updates.go:57`, `fingerprintInBlocklist`). The blocklist is keyed by certificate *fingerprint* (`internal/store/sqlite.go`), so a re-enrollment produces a new fingerprint that is not in the blocklist. `mintEnrollmentTokenForHost` (`internal/api/hosts.go:491`) authorizes the caller via `canAccessHost` but does **not** check the host status. There is no guard preventing a `blocked` host from transitioning back to `enrolled` (`internal/store/sqlite.go`, `enrollHostInTx` updates status unconditionally). **Impact:** A host that an operator has blocked can be silently un-blocked by issuing a new enrollment token and re-enrolling — it receives a fresh certificate (new fingerprint) that passes all subsequent poll-time blocklist checks. Re
03 / Response
What to do next
- investigate
Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.
Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system. GitHub Advisory Database
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04 / Limits
What this report cannot establish
- Customer inventory, deployment, reachability and exploitation have not been inspected.
05 / Provenance
Sources you can inspect
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- GHSA-339v-266x-79xr ↗
GitHub Advisory Database · vendor advisory
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Public revision history
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- Revision 1 ·
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