libp2p nodes vulnerable to attack using large RSA keys

高 7.5CVE-2023-39533 · GHSA-876p-8259-xjgg · GO-2023-2000 · 08/08/2023 公開 · 01/09/2026 更新

要点

CVE-2023-39533 は github.com/libp2p/go-libp2p, go-libp2p (libp2p) に影響する深刻度「高」 (CVSS 7.5) の脆弱性です。
今後30日間に悪用される確率（EPSS）：1.5%（全脆弱性の 74.5% より高い）。
対処：0.28.2, 0.29.1, 0.27.8 以降に更新してください。

パッケージ	影響を受けるバージョン	修正済みバージョン
github.com/libp2p/go-libp2p Go	`≥ 0.28.0, < 0.28.2≥ 0.29.0, < 0.29.1< 0.27.8`	`0.28.20.29.10.27.8`
go-libp2p libp2p	`= 0.29.0≥ 0.28.0, < 0.28.2< 0.27.8`	`0.28.20.27.8`

概要

Impact

A malicious peer can use large RSA keys to run a resource exhaustion attack & force a node to spend time doing signature verification of the large key. This vulnerability is present in the core/crypto module of go-libp2p and can occur during the Noise handshake and the libp2p x509 extension verification step. To prevent this attack, go-libp2p now restricts RSA keys to <= 8192 bits.

Patches

Users should upgrade their go-libp2p versions to >=v0.27.8, >= v0.28.2, or >=v0.29.1 To protect your application, it's necessary to update to these patch releases AND to use the updated Go compiler (1.20.7 or 1.19.12, respectively)

Workarounds

There are no known workarounds

References

The Golang crypto/tls package also had this vulnerability ("verifying certificate chains containing large RSA keys is slow” https://github.com/golang/go/issues/61460) Fix in golang/go crypto/tls: https://github.com/golang/go/commit/2350afd2e8ab054390e284c95d5b089c142db017 Fix in quic-go https://github.com/quic-go/quic-go/pull/4012

NVD の説明

go-libp2p is the Go implementation of the libp2p Networking Stack. Prior to versions 0.27.8, 0.28.2, and 0.29.1 malicious peer can use large RSA keys to run a resource exhaustion attack & force a node to spend time doing signature verification of the large key. This vulnerability is present in the core/crypto module of go-libp2p and can occur during the Noise handshake and the libp2p x509 extension verification step. To prevent this attack, go-libp2p versions 0.27.8, 0.28.2, and 0.29.1 restrict RSA keys to <= 8192 bits. To protect one's application, it is necessary to update to these patch releases and to use the updated Go compiler in 1.20.7 or 1.19.12. There are no known workarounds for this issue.