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Automatic information enumeration

Description​

It is possible to automatically enumerate system information such as open ports, available services and users personal data.

Impact​

  • Obtain information from internal users.
  • Obtain account information from partners and suppliers.

Recommendation​

Filter the information that is received through the ports avoiding the detection of services.

Threat​

Anonymous attacker from the Internet.

Expected Remediation Time​

⌚ 30 minutes.

Score​

Default score using CVSS 3.1. It may change depending on the context of the vulnerability.

Base​

  • Attack vector: N
  • Attack complexity: L
  • Privileges required: L
  • User interaction: N
  • Scope: C
  • Confidentiality: L
  • Integrity: N
  • Availability: N

Temporal​

  • Exploit code madurity: X
  • Remediation level: X
  • Report confidence: X

Result​

  • Vector string: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N/E:X/RL:X/RC:X
  • Score:
    • Base: 5.0
    • Temporal: 5.0
  • Severity:
    • Base: Medium
    • Temporal: Medium

Code Examples​

Compliant code​

Correctly configure the filters of information according to port numbers

Resources:
  securityGroup1:
    Properties:
      GroupDescription: groupDescription1
      SecurityGroupIngress:
        - CidrIp: 34.229.161.227/16
          IpProtocol: "tcp"
      SecurityGroupEgress:
        - CidrIp: 34.229.161.227/16
          IpProtocol: "tcp"
    Type: AWS::EC2::SecurityGroup

Non compliant code​

Incorrectly configure a resource to not filter information by restricting ports

Resources:
  securityGroup1:
    Properties:
      GroupDescription: groupDescription1
      SecurityGroupIngress:
        - CidrIp: 34.229.161.227/16
          FromPort: 1
          IpProtocol: "-1"
          ToPort: 65535
      SecurityGroupEgress:
        - CidrIp: 34.229.161.227/16
          FromPort: 8080
          IpProtocol: "-1"
          ToPort: 8080
    Type: AWS::EC2::SecurityGroup

Requirements​

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