CVE-2021-4239 Information

Description

The Noise protocol implementation suffers from weakened cryptographic security after encrypting 2^64 messages and a potential denial of service attack. After 2^64 (~18.4 quintillion) messages are encrypted with the Encrypt function the nonce counter will wrap around causing multiple messages to be encrypted with the same key and nonce. In a separate issue the Decrypt function increments the nonce state even when it fails to decrypt a message. If an attacker can provide an invalid input to the Decrypt function this will cause the nonce state to desynchronize between the peers resulting in a failure to encrypt all subsequent messages.

Reference

https://github.com/flynn/noise/pull/44 https://pkg.go.dev/vuln/GO-2022-0425