Vulnerability · Published Dec 8, 2022 · Assigned by GitHub_M
CVE-2022-23495ProtoNode may be modified such that common method calls may panic in ipfs/go-merkledag
High 7.5
In plain English
A high-severity security flaw in go-merkledag from ipfs. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.4% (higher than 72% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/ipfs/go-merkledag | 0.8.1 | GHSA-x39j-h85h-3f46 |
| Go | github.com/ipfs/go-merkledag | 0.8.1 | GO-2022-1155 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| ipfs | go-merkledag | >= 0.4.0, < 0.8.1 |
Weakness: CWE-755 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
References
- https://github.com/ipfs/go-merkledag/security/advisories/GHSA-x39j-h85h-3f46 x_refsource_CONFIRM
- https://github.com/ipfs/go-merkledag/issues/90 x_refsource_MISC
- https://github.com/ipfs/kubo/issues/9297 x_refsource_MISC
- https://github.com/ipfs/go-merkledag/pull/91 x_refsource_MISC
- https://github.com/ipfs/go-merkledag/pull/92 x_refsource_MISC
- https://github.com/ipfs/go-merkledag/pull/93 x_refsource_MISC
- https://en.wikipedia.org/wiki/Directed_acyclic_graph x_refsource_MISC
- https://github.com/ipfs/go-merkledag/releases/tag/v0.8.0 x_refsource_MISC
- https://github.com/ipfs/go-merkledag/releases/tag/v0.8.1 x_refsource_MISC