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Nuclei Templates

Limit SSH Users Group Access

ID: file-limit-ssh-group

Severity: unknown

Author: pussycat0x

Tags: audit,config,file,ssh

Description

Section titled “Description”

Limiting SSH user group access enhances security by restricting login permissions to authorized groups, reducing the attack surface and preventing unauthorized access.

YAML Source

Section titled “YAML Source”
id: file-limit-ssh-group


info:
  name: Limit SSH Users Group Access
  author: pussycat0x
  severity: unknown
  description: |
    Limiting SSH user group access enhances security by restricting login permissions to authorized groups, reducing the attack surface and preventing unauthorized access.
  remediation: |
    Ensure only necessary users are listed in AllowUsers within /etc/ssh/sshd_config, then restart the SSH service.
  reference:
    - https://vishalraj82.medium.com/hardening-openssh-security-37f5d634015f
    - https://cloud.ibm.com/docs/ssh-keys?topic=ssh-keys-granting-ssh-access-to-a-user
  metadata:
    verified: true
  tags: audit,config,file,ssh


file:
  - extensions:
      - all


    matchers-condition: and
    matchers:
      - type: word
        words:
          - "# This is the sshd server system-wide configuration file"


      - type: word
        words:
          - "AllowGroups"
        negative: true
# digest: 490a0046304402201bf46836cc1c9c0d678530c5166f58c9e6d2be6bde12ee9df19c3f611ecacd7f022011099d6e8891b6948a096831ef5eab2e747b1fe16de30f10dd8d50fc27c0ea37:922c64590222798bb761d5b6d8e72950

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 "file/audit/ssh/file-limit-ssh-group.yaml"

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