Informazioni sul CVE-2023-34459
OpenZeppelin Contracts's MerkleProof multiproofs may allow proving arbitrary leaves for specific trees
CWE ID: CWE-354
Base Score (CVSS): N/A
CVE: CVE-2023-34459
Descrizione: OpenZeppelin Contracts is a library for smart contract development. Starting in version 4.7.0 and prior to version 4.9.2, when the `verifyMultiProof`, `verifyMultiProofCalldata`, `procesprocessMultiProof`, or `processMultiProofCalldat` functions are in use, it is possible to construct merkle trees that allow forging a valid multiproof for an arbitrary set of leaves. A contract may be vulnerable if it uses multiproofs for verification and the merkle tree that is processed includes a node with value 0 at depth 1 (just under the root). This could happen inadvertedly for balanced trees with 3 leaves or less, if the leaves are not hashed. This could happen deliberately if a malicious tree builder includes such a node in the tree. A contract is not vulnerable if it uses single-leaf proving (`verify`, `verifyCalldata`, `processProof`, or `processProofCalldata`), or if it uses multiproofs with a known tree that has hashed leaves. Standard merkle trees produced or validated with the @openzeppelin/merkle-tree library are safe. The problem has been patched in version 4.9.2. Some workarounds are available. For those using multiproofs: When constructing merkle trees hash the leaves and do not insert empty nodes in your trees. Using the @openzeppelin/merkle-tree package eliminates this issue. Do not accept user-provided merkle roots without reconstructing at least the first level of the tree. Verify the merkle tree structure by reconstructing it from the leaves.
Vettore di attacco CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N
Punteggio CVSS
Il CVSS è un sistema di valutazione che misura la gravità di una vulnerabilità informatica considerando fattori come l’impatto potenziale, la probabilità di attacco e la facilità di esecuzione.
Riassunto: Accesso: Network, Privilegi: Low, Interazione utente: None, Confidenzialità: None, Integrità: High, Disponibilità: None.
Dettaglio del Vettore
| Metrica | Valore | Significato | Descrizione |
|---|---|---|---|
| Attack Vector (AV) | N | Network | L’attacco può essere eseguito da remoto attraverso la rete. |
| Attack Complexity (AC) | H | High | L’attacco richiede condizioni particolari o avanzate. |
| Privileges Required (PR) | L | Low | Richiede pochi privilegi. |
| User Interaction (UI) | N | None | Non è richiesta interazione dell’utente. |
| Scope (S) | U | Unchanged | Il raggio d’azione non cambia. |
| Confidentiality Impact (C) | N | None | Nessun impatto sulla riservatezza. |
| Integrity Impact (I) | H | High | Grave impatto sull’integrità. |
| Availability Impact (A) | N | None | Nessun impatto sulla disponibilità. |
Riferimenti esterni
- https://github.com/OpenZeppelin/openzeppelin-contracts/security/advisories/GHSA-wprv-93r4-jj2p
- https://github.com/OpenZeppelin/openzeppelin-contracts/commit/4d2383e17186be3e8ccf5a442e9686ecc7de1c55
- https://github.com/OpenZeppelin/openzeppelin-contracts/releases/tag/v4.9.2
Prodotti interessati
- OpenZeppelin – openzeppelin-contracts
Relazioni con altri prodotti
Produttore:OpenZeppelin
Prodotto: openzeppelin-contracts
Anno: 2023
CWE: CWE-354
CVSS: 0.0