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GHSA-gv5w-hfx8-8cwq
github.com/seaweedfs/seaweedfsImpact
When a filer JWT restricts a token to a set of path prefixes via allowed_prefixes, the authorization check used a literal byte-prefix match (strings.HasPrefix). A token scoped to /tenant1 therefore also authorized requests to sibling paths such as /tenant1234, /tenant1-old, and /tenant1backup.
In a multi-tenant deployment this lets the holder of one tenant's token access another tenant's data. Because allowed_prefixes gates both read and write tokens, the impact covers cross-tenant reads and writes. A valid scoped token is required, so this is an authorization bypass rather than a fully unauthenticated flaw.
Affected component
weed/server/filer_server_handlers.go(JWTallowed_prefixesauthorization check)
Patches
Fixed in 4.24. The check now matches on /-separated path components after path.Clean normalisation, so /tenant1 authorizes only /tenant1 and its descendants — not /tenant1234 or other sibling paths.
Workarounds
Where feasible, choose prefix names that are not string-prefixes of one another (e.g. keep a trailing separator convention). Upgrade to 4.24.
References
- Reported by Kadir Arslan (https://github.com/KadirArslan)
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The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker needs basic access or low-level privileges. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a high impact on the confidentiality of the information. There is a high impact on the integrity of the data.
Exploitation activity has been observed. Apply available patches or mitigations urgently.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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