modules:
  - module: golang.org/x/crypto
    versions:
      - fixed: 0.0.0-20220314234659-1baeb1ce4c0b
    packages:
      - package: golang.org/x/crypto/ssh
        symbols:
          - ServerConfig.AddHostKey
        derived_symbols:
          - ServerConfig.AddHostKey
description: |
    Attackers can cause a crash in SSH servers when the server has been
    configured by passing a Signer to ServerConfig.AddHostKey such that
     1) the Signer passed to AddHostKey does not implement AlgorithmSigner, and
     2) the Signer passed to AddHostKey returns a key of type “ssh-rsa” from its
      PublicKey method.

    Servers that only use Signer implementations provided by the ssh package are
    unaffected.
published: 2022-04-25T20:38:40Z
cves:
  - CVE-2022-27191
ghsas:
  - GHSA-8c26-wmh5-6g9v
references:
  - fix: https://go.dev/cl/392355
  - fix: https://go.googlesource.com/crypto/+/1baeb1ce4c0b006eff0f294c47cb7617598dfb3d
  - web: https://groups.google.com/g/golang-announce
  - web: https://groups.google.com/g/golang-announce/c/-cp44ypCT5s