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Nuclei Templates

Restrict EC2 FTP Access

ID: ec2-unrestricted-ftp

Severity: critical

Author: princechaddha

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

Description

Section titled “Description”

Ensure Amazon EC2 security groups disallow unrestricted inbound FTP access on TCP ports 20 and 21 to prevent brute force attacks.

YAML Source

Section titled “YAML Source”
id: ec2-unrestricted-ftp
info:
  name: Restrict EC2 FTP Access
  author: princechaddha
  severity: critical
  description: |
    Ensure Amazon EC2 security groups disallow unrestricted inbound FTP access on TCP ports 20 and 21 to prevent brute force attacks.
  impact: |
    Unrestricted FTP access can expose EC2 instances to unauthorized access and brute force attacks, compromising security.
  remediation: |
    Restrict inbound access on TCP ports 20 and 21 for EC2 security groups to known IPs or remove the rules if FTP is not required.
  reference:
    - https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/using-network-security.html#security-group-rules
  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=20,21 Name=ip-permission.to-port,Values=20,21 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 20 or 21"'
# digest: 4b0a0048304602210099cdfad1028ecd96b255e64daac8277a337b818477a9657029246e6bef352cbc022100fe7cd54009ac03eb7d34820acbcec4894d9c77ccffeefb02733dce108a7b567b: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-ftp.yaml"

View on Github