CVE-2022-23495
Vulnérabilité élevée dans go-merkledag (ipfs)
Description
go-merkledag implements the 'DAGService' interface and adds two ipld node types, Protobuf and Raw for the ipfs project. A `ProtoNode` may be modified in such a way as to cause various encode errors which will trigger a panic on common method calls that don't allow for error returns. A `ProtoNode` should only be able to encode to valid DAG-PB, attempting to encode invalid DAG-PB forms will result in an error from the codec. Manipulation of an existing (newly created or decoded) `ProtoNode` using the modifier methods did not account for certain states that would place the `ProtoNode` into an unencodeable form. Due to conformance with the [`github.com/ipfs/go-block-format#Block`](https://pkg.go.dev/github.com/ipfs/go-block-format#Block) and [`github.com/ipfs/go-ipld-format#Node`](https://pkg.go.dev/github.com/ipfs/go-ipld-format#Node) interfaces, certain methods, which internally require a re-encode if state has changed, will panic due to the inability to return an error. This issue has been addressed across a number of pull requests. Users are advised to upgrade to version 0.8.1 for a complete set of fixes. Users unable to upgrade may attempt to mitigate this issue by sanitising inputs when allowing user-input to set a new `CidBuilder` on a `ProtoNode` and by sanitising `Tsize` (`Link#Size`) values such that they are a reasonable byte-size for sub-DAGs where derived from user-input.
Gravité et risque d'exploitation
CVE-2022-23495 obtient un score CVSS de 7.5/10, soit une gravité élevée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 1.38 %, ce qui la place devant 71.7 % des CVE référencées.
Que faire ?
- Vérifiez si go-merkledag (versions >= 0.4.0, < 0.8.1) est présent sur votre parc.
- Appliquez le correctif ou la version corrigée indiqués dans les références de l'éditeur.
- À défaut de correctif, limitez l'exposition (filtrage réseau, désactivation du composant).
- Automatisez la détection : les agents CVE Heimdall (gratuits, open source) corrèlent l'inventaire de vos serveurs avec la base CVE.
Références
- https://github.com/ipfs/go-merkledag/security/advisories/GHSA-x39j-h85h-3f46
- https://github.com/ipfs/go-merkledag/issues/90
- https://github.com/ipfs/kubo/issues/9297
- https://github.com/ipfs/go-merkledag/pull/91
- https://github.com/ipfs/go-merkledag/pull/92
- https://github.com/ipfs/go-merkledag/pull/93
- https://en.wikipedia.org/wiki/Directed_acyclic_graph
- https://github.com/ipfs/go-merkledag/releases/tag/v0.8.0
- https://github.com/ipfs/go-merkledag/releases/tag/v0.8.1