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Nuclei Templates

EC2 Unrestricted CIFS Access

ID: ec2-unrestricted-cifs

Severity: critical

Author: princechaddha

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

Description

Section titled “Description”

Checks for inbound rules in Amazon EC2 security groups allowing unrestricted access (0.0.0.0/0 or ::/0) on TCP port 445, used for CIFS/SMB file sharing, posing a high security risk.

YAML Source

Section titled “YAML Source”
id: ec2-unrestricted-cifs
info:
  name: EC2 Unrestricted CIFS Access
  author: princechaddha
  severity: critical
  description: |
    Checks for inbound rules in Amazon EC2 security groups allowing unrestricted access (0.0.0.0/0 or ::/0) on TCP port 445, used for CIFS/SMB file sharing, posing a high security risk.
  impact: |
    Unrestricted CIFS access can expose EC2 instances to unwanted external access, increasing the risk of data breaches and unauthorized control over resources.
  remediation: |
    Restrict inbound access on TCP port 445 to known IPs or ranges. Regularly review security group configurations to ensure compliance with security policies.
  reference:
    - https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/using-network-security.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=445 Name=ip-permission.to-port,Values=445 Name=ip-permission.cidr,Values='0.0.0.0/0' Name=ip-permission.ipv6-cidr,Values='::/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 445"'
# digest: 4a0a0047304502210097f5bd76a88837f9b5e95e8e80f5995cd3c54f0a3469731fb144c5d69323f26a022007272036cbffa31f0e1fb4ecbc160686740a8a5f341656b6cc8189394a387690:922c64590222798bb761d5b6d8e72950

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-cifs.yaml"

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