id: GO-2020-0013
modules:
    - module: golang.org/x/crypto
      versions:
        - fixed: 0.0.0-20170330155735-e4e2799dd7aa
      vulnerable_at: 0.0.0-20170317163734-459e26527287
      packages:
        - package: golang.org/x/crypto/ssh
          symbols:
            - NewClientConn
          derived_symbols:
            - Dial
summary: Man-in-the-middle attack in golang.org/x/crypto/ssh
description: |-
    By default host key verification is disabled which allows for man-in-the-middle
    attacks against SSH clients if ClientConfig.HostKeyCallback is not set.
published: 2021-04-14T20:04:52Z
cves:
    - CVE-2017-3204
ghsas:
    - GHSA-xhjq-w7xm-p8qj
credits:
    - Phil Pennock
references:
    - fix: https://go.dev/cl/340830
    - fix: https://go.googlesource.com/crypto/+/e4e2799dd7aab89f583e1d898300d96367750991
    - report: https://go.dev/issue/19767
    - web: https://bridge.grumpy-troll.org/2017/04/golang-ssh-security/