{"id":"GHSA-87fv-vqqr-m4jr","summary":"SeaweedFS: Unauthenticated SSRF with response read-back via VolumeServer.FetchAndWriteNeedle","details":"### Impact\n`VolumeServer.FetchAndWriteNeedle` fetches a caller-supplied remote endpoint and writes the response into a needle. Before 4.24 this RPC performed no authentication and no validation of the target, so anyone able to reach a volume server's gRPC port could coerce the server into issuing requests to arbitrary hosts — including loopback, link-local, RFC 1918, and cloud metadata endpoints such as `169.254.169.254` — and read the response back. On cloud deployments this discloses instance metadata and IAM credentials, and can be used to reach otherwise-unexposed internal services (SSRF with response read-back).\n\nThe volume server gRPC plane is unauthenticated on a default deployment, so no credentials are required. Configuring the documented JWT signing keys does not close it, because that hardening does not apply to this RPC.\n\n### Affected component\n- `weed/server/volume_grpc_remote.go` (`FetchAndWriteNeedle`)\n- `weed/remote_storage/s3/s3_storage_client.go`\n\n### Patches\nFixed in **4.24**. `FetchAndWriteNeedle` now requires admin authorization and refuses loopback / link-local / RFC 1918 / IMDS destinations through a guarded dialer that resolves the host itself and pins the resolved address for the duration of the request, defeating DNS-rebinding. The Rust volume server carries the equivalent endpoint validation.\n\n### Workarounds\nRestrict volume server gRPC ports to trusted hosts via firewall / network policy, and enable mTLS via `security.toml`.","aliases":["BIT-seaweedfs-2026-73080","CVE-2026-73080","GO-2026-6219"],"modified":"2026-08-18T15:11:25.403157164Z","published":"2026-08-11T15:58:23Z","database_specific":{"github_reviewed":true,"github_reviewed_at":"2026-08-11T15:58:23Z","nvd_published_at":null,"cwe_ids":["CWE-918"],"severity":"CRITICAL"},"references":[{"type":"WEB","url":"https://github.com/seaweedfs/seaweedfs/security/advisories/GHSA-87fv-vqqr-m4jr"},{"type":"WEB","url":"https://github.com/seaweedfs/seaweedfs/pull/9441"},{"type":"WEB","url":"https://github.com/seaweedfs/seaweedfs/commit/69da20bdaec923e5a43d8aa71bf3c0a2051fc019"},{"type":"PACKAGE","url":"https://github.com/seaweedfs/seaweedfs"},{"type":"WEB","url":"https://github.com/seaweedfs/seaweedfs/releases/tag/4.24"}],"affected":[{"package":{"name":"github.com/seaweedfs/seaweedfs","ecosystem":"Go","purl":"pkg:golang/github.com/seaweedfs/seaweedfs"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"0.0.0-20260512171120-69da20bdaec9"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/08/GHSA-87fv-vqqr-m4jr/GHSA-87fv-vqqr-m4jr.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N"}]}