nuclei-templates/cloud/aws/ec2/ec2-unrestricted-ftp.yaml

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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"'
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