libp2p nodes vulnerable to attack using large RSA keys
Package
Affected versions
< 0.27.8
>= 0.28.0, < 0.28.2
= 0.29.0
Patched versions
0.27.8
0.28.2
0.29.1
Description
Published by the National Vulnerability Database
Aug 8, 2023
Published to the GitHub Advisory Database
Aug 9, 2023
Reviewed
Aug 9, 2023
Last updated
Nov 10, 2023
Credits
-
marten-seemann Finder
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” golang/go#61460)
Fix in golang/go crypto/tls: golang/go@2350afd
Fix in quic-go quic-go/quic-go#4012
References