id: GO-2022-0425
modules:
    - module: github.com/flynn/noise
      versions:
        - fixed: 1.0.0
      vulnerable_at: 0.0.0-20210422170017-fc2bb37e287b
      packages:
        - package: github.com/flynn/noise
          symbols:
            - CipherState.Encrypt
            - CipherState.Decrypt
            - symmetricState.EncryptAndHash
          derived_symbols:
            - HandshakeState.ReadMessage
            - HandshakeState.WriteMessage
            - symmetricState.DecryptAndHash
summary: 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.
published: 2022-02-15T01:57:18Z
ghsas:
    - GHSA-6cr6-fmvc-vw2p
    - GHSA-g9mp-8g3h-3c5c
references:
    - fix: https://github.com/flynn/noise/pull/44
cve_metadata:
    id: CVE-2021-4239
    cwe: 'CWE 400: Uncontrolled Resource Consumption'