vulnerability / NVI-00017787 / Revision 1
Nezha Monitoring: Pre-auth path traversal via /dashboard.. prefix confusion leaks jwt_secret_key
GitHub lists this reviewed advisory for github.com/nezhahq/nezha. 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.
9.1 critical
GitHub source severity; exploitability and local consequence require separate evidence.
As of · GitHub Advisory Database
02 / Applicability
The affected context
Affected versions, configuration prerequisites and known exclusions are public. Confirm each one against the deployed service.
github.com/nezhahq/nezha
source listed< 2.0.13
### Summary `fallbackToFrontend` in the dashboard's `NoRoute` handler treats any URL whose **raw string** starts with `/dashboard` as an admin-frontend asset request. The check uses `strings.HasPrefix`, not a path-segment match, so the input `/dashboard../data/config.yaml` is accepted; `strings.TrimPrefix` leaves `../data/config.yaml`; and `path.Join("admin-dist", "../data/config.yaml")` normalizes to `data/config.yaml` — which `os.Stat` finds and `http.ServeFile` returns. No authentication required. In default deployments (the values shipped in `model/config.go` and the layout shipped in the project `Dockerfile`) `data/config.yaml` contains the HS256 `jwt_secret_key` used by `cmd/dashboard/controller/jwt.go` to sign every dashboard session cookie. A unauth attacker reads that secret, forges an admin JWT, and signs in as any user — full dashboard takeover from one GET request. ### Details ## Root cause ```go // cmd/dashboard/controller/controller.go @ 636f4a9 387: fallbackStatusCode := getFallbackStatusCode(c.Request.URL.Path) 388: if strings.HasPrefix(c.Request.URL.Path, "/dashboard") { 389: stripPath := strings.TrimPrefix(c.Request.URL.Path, "/dashboard") 390:
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.
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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-5c25-7vpj-9mqh ↗
GitHub Advisory Database · vendor advisory
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Public revision history
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- Revision 1 ·
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