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Vulnerability · Published Aug 8, 2023 · Assigned by GitHub_M

CVE-2023-39533libp2p nodes vulnerable to attack using large RSA keys

High 7.5

In plain English

A high-severity resource allocation without limits in go-libp2p from libp2p. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 1.5% (higher than 75% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.5High
Exploit odds (30 days)1.5%top 25.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official description

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Gogithub.com/libp2p/go-libp2p0.27.8, 0.28.2, 0.29.1GO-2023-2000
Gogithub.com/libp2p/go-libp2p0.27.8GHSA-876p-8259-xjgg
Gogithub.com/libp2p/go-libp2p0.28.2GHSA-876p-8259-xjgg
Gogithub.com/libp2p/go-libp2p0.29.1GHSA-876p-8259-xjgg

Affected products (as reported)

VendorProductVersions
libp2p go-libp2p < 0.27.8>= 0.28.0, < 0.28.2= 0.29.0

Weakness: CWE-770 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References