Description
Posta before v0.18.0 contains a server-side request forgery vulnerability that allows authenticated users with edit rights to make the backend send POST requests to internal destinations by creating webhooks with arbitrary URLs. Attackers can target loopback, private-network or cloud metadata addresses and read delivery status codes and error strings to probe internal hosts and ports.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| goposta | posta | < v0.18.0 | v0.18.0 |
References
- https://github.com/goposta/posta/issues/282 issue-tracking
- https://github.com/goposta/posta/pull/315 patch issue-tracking
- https://github.com/goposta/posta/commit/6bb376b55dcfdcb979040ed42c4bf57b99e4f46a patch
- posta v0.18.0 Release Notes release-notes
- https://github.com/goposta/posta/blob/8c3cb6f89c8a992329fac21491c38aed70d05c73/internal/services/webhook/dispatcher.go#L321-L338 technical-description
- VulnCheck Advisory: Posta before v0.18.0 SSRF via Webhook URL third-party-advisory