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Nuclei Templates

SSH Diffie-Hellman Modulus <= 1024 Bits

ID: ssh-diffie-hellman-logjam

Severity: low

Author: pussycat0x

Tags: js,enum,ssh,misconfig,network

Description

Section titled “Description”

SSH weak algorithms are outdated cryptographic methods that pose security risks. Identifying and disabling these vulnerable algorithms is crucial for enhancing the overall security of SSH connections.

YAML Source

Section titled “YAML Source”
id: ssh-diffie-hellman-logjam


info:
  name: SSH Diffie-Hellman Modulus <= 1024 Bits
  author: pussycat0x
  severity: low
  description: |
    SSH weak algorithms are outdated cryptographic methods that pose security risks. Identifying and disabling these vulnerable algorithms is crucial for enhancing the overall security of SSH connections.
  reference:
    - https://access.redhat.com/solutions/4278651
  metadata:
    verified: true
    max-request: 2
    shodan-query: product:"OpenSSH"
  tags: js,enum,ssh,misconfig,network


javascript:
  - pre-condition: |
      isPortOpen(Host,Port);
    code: |
      let m = require("nuclei/ssh");
      let c = m.SSHClient();
      let response = c.ConnectSSHInfoMode(Host, Port);
      Export(response);


    args:
      Host: "{{Host}}"
      Port: "22"


    matchers-condition: and
    matchers:
      - type: word
        words:
          - "kex_algorithms"


      - type: word
        words:
          - "diffie-hellman-group1-sha1"
# digest: 490a004630440220643b504686621acaa59b44f31c6d395e9c915e5e3dfaff35382bb130efeda6f002207b350d7fed19b80f557f80417e9c8ad0b3e3ce382bca1c1b16fdee2f443c3d64:922c64590222798bb761d5b6d8e72950

Guide to check the vulnerabilities

Section titled “Guide to check the vulnerabilities”

This template is used to detect vulnerabilities in web applications. It can be used with the Nuclei tool to scan for specific patterns or behaviors.

Terminal window
$ nuclei -u "URL" -t "javascript/enumeration/ssh/ssh-diffie-hellman-logjam.yaml"

View on Github