id: CVE-2018-15473

info:
  name: OpenSSH Username Enumeration <= v7.7
  author: r3dg33k,daffainfo,forgedhallpass
  severity: medium
  description: OpenSSH through 7.7 is prone to a user enumeration vulnerability due to not delaying bailout for an invalid authenticating user until after the packet containing the request has been fully parsed, related to auth2-gss.c, auth2-hostbased.c, and auth2-pubkey.c.
  reference:
    - https://nvd.nist.gov/vuln/detail/CVE-2018-15473
    - https://github.com/openbsd/src/commit/779974d35b4859c07bc3cb8a12c74b43b0a7d1e0
    - https://bugs.debian.org/906236
    - http://www.openwall.com/lists/oss-security/2018/08/15/5
  classification:
    cvss-metrics: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
    cvss-score: 5.3
    cve-id: CVE-2018-15473
    cwe-id: CWE-362
  tags: network,openssh,cve,cve2018

network:
  - host:
      - "{{Hostname}}"
      - "{{Host}}:22"

    matchers:
      - type: regex
        regex:
          - '(?i)SSH-2.0-OpenSSH_(?:[1-6][^\d][^\r]+|7\.[0-7][^\d][^\r]+)'

    extractors:
      - type: regex
        regex:
          - '(?i)SSH-2.0-OpenSSH_[^\r]+'