title: Weak encryption and denial of service in github.com/flynn/noise
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.
problem types: CWE 400: Uncontrolled Resource Consumption
affected:
{
vendor: github.com/flynn/noise
product: github.com/flynn/noise
collectionURL: https://pkg.go.dev
packageName: github.com/flynn/noise
versions:
version: 0, lessThan: 1.0.0, status: affected, versionType: semver
programRoutines:
name: CipherState.Encrypt
name: CipherState.Decrypt
name: symmetricState.EncryptAndHash
name: HandshakeState.ReadMessage
name: HandshakeState.WriteMessage
name: symmetricState.DecryptAndHash
defaultStatus: unaffected
}