Skip to content
Nuclei Templates

Unrestricted SSH Access in EC2

ID: ec2-unrestricted-ssh

Severity: high

Author: princechaddha

Tags: cloud,devops,aws,amazon,ec2,aws-cloud-config

Description

Section titled “Description”

Checks for inbound rules in Amazon EC2 security groups that allow unrestricted SSH access (0.0.0.0/0 or ::/0) on TCP port 22, indicating a security risk by exposing the SSH server to the internet.

YAML Source

Section titled “YAML Source”
id: ec2-unrestricted-ssh
info:
  name: Unrestricted SSH Access in EC2
  author: princechaddha
  severity: high
  description: |
    Checks for inbound rules in Amazon EC2 security groups that allow unrestricted SSH access (0.0.0.0/0 or ::/0) on TCP port 22, indicating a security risk by exposing the SSH server to the internet.
  impact: |
    Unrestricted SSH access increases the risk of unauthorized access and potential brute force attacks against the SSH server, compromising the security of the EC2 instances.
  remediation: |
    Restrict SSH access in EC2 security groups to trusted IP addresses or ranges, adhering to the Principle of Least Privilege (POLP) and mitigating the risk of unauthorized access.
  reference:
    - https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/security-group-rules-reference.html
  tags: cloud,devops,aws,amazon,ec2,aws-cloud-config


variables:
  region: "us-east-1"


self-contained: true
code:
  - engine:
      - sh
      - bash
    source: |
      aws ec2 describe-security-groups --region $region --filters Name=ip-permission.from-port,Values=22 Name=ip-permission.to-port,Values=22 Name=ip-permission.cidr,Values='0.0.0.0/0' --output json --query 'SecurityGroups[*].GroupId'


    extractors:
      - type: json
        name: securitygroup
        internal: true
        json:
          - '.[]'


      - type: dsl
        dsl:
          - 'securitygroup + " security group(s) alows unrestricted access (0.0.0.0/0 or ::/0) on TCP port 22"'
# digest: 4b0a00483046022100e8074eceea770759e675b6129efa00627dced989dcc885eb2be386f01e6e6f20022100ef26f24ef231e9d10f9f1e8309f5fa0e24068ba4560570a071c1e82b36c2bd28:922c64590222798bb761d5b6d8e72950

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 "cloud/aws/ec2/ec2-unrestricted-ssh.yaml"

View on Github