modules:
  - module: golang.org/x/crypto
    versions:
      - fixed: 0.0.0-20200220183623-bac4c82f6975
    vulnerable_at: 0.0.0-20200219234226-1ad67e1f0ef4
    packages:
      - package: golang.org/x/crypto/ssh
        symbols:
          - parseED25519
          - ed25519PublicKey.Verify
          - parseSKEd25519
          - skEd25519PublicKey.Verify
          - NewPublicKey
        derived_symbols:
          - CertChecker.Authenticate
          - CertChecker.CheckCert
          - CertChecker.CheckHostKey
          - Certificate.Verify
          - Dial
          - NewClientConn
          - NewServerConn
          - NewSignerFromKey
          - NewSignerFromSigner
          - ParseAuthorizedKey
          - ParseKnownHosts
          - ParsePrivateKey
          - ParsePrivateKeyWithPassphrase
          - ParsePublicKey
          - ParseRawPrivateKey
          - ParseRawPrivateKeyWithPassphrase
summary: |
    Panic due to improper verification of cryptographic signatures in golang.org/x/crypto/ssh
description: |
    An attacker can craft an ssh-ed25519 or sk-ssh-ed25519@openssh.com public
    key, such that the library will panic when trying to verify a signature
    with it. If verifying signatures using user supplied public keys, this
    may be used as a denial of service vector.
published: 2021-04-14T20:04:52Z
cves:
  - CVE-2020-9283
ghsas:
  - GHSA-ffhg-7mh4-33c4
credits:
  - Alex Gaynor, Fish in a Barrel
references:
  - fix: https://go.dev/cl/220357
  - fix: https://go.googlesource.com/crypto/+/bac4c82f69751a6dd76e702d54b3ceb88adab236
  - web: https://groups.google.com/g/golang-announce/c/3L45YRc91SY