Default Security Groups With Unrestricted Traffic
- Query id: ea33fcf7-394b-4d11-a228-985c5d08f205
- Query name: Default Security Groups With Unrestricted Traffic
- Platform: CloudFormation
- Severity: High
- Category: Networking and Firewall
- URL: Github
Description¶
Check if default security group does not restrict all inbound and outbound traffic.
Documentation
Code samples¶
Code samples with security vulnerabilities¶
Postitive test num. 1 - yaml file
Parameters:
KeyName:
Description: The EC2 Key Pair to allow SSH access to the instance
Type: 'AWS::EC2::KeyPair::KeyName'
Resources:
Ec2Instance:
Type: 'AWS::EC2::Instance'
Properties:
SecurityGroups:
- !Ref InstanceSecurityGroup
- MyExistingSecurityGroup
KeyName: !Ref KeyName
ImageId: ami-7a11e213
InstanceSecurityGroup:
Type: 'AWS::EC2::SecurityGroup'
Properties:
GroupName: default
GroupDescription: Enable SSH access via port 22
SecurityGroupIngress:
- IpProtocol: tcp
FromPort: '22'
ToPort: '22'
CidrIp: 0.0.0.0/0
SecurityGroupEgress:
- IpProtocol: tcp
FromPort: '22'
ToPort: '22'
CidrIp: 0.0.0.0/0
Postitive test num. 2 - json file
{
"Parameters": {
"KeyName": {
"Description": "The EC2 Key Pair to allow SSH access to the instance",
"Type": "AWS::EC2::KeyPair::KeyName"
}
},
"Resources": {
"Ec2Instance": {
"Type": "AWS::EC2::Instance",
"Properties": {
"SecurityGroups": [
"InstanceSecurityGroup",
"MyExistingSecurityGroup"
],
"KeyName": "KeyName",
"ImageId": "ami-7a11e213"
}
},
"InstanceSecurityGroup": {
"Properties": {
"GroupName": "default",
"GroupDescription": "Enable SSH access via port 22",
"SecurityGroupIngress": [
{
"IpProtocol": "tcp",
"FromPort": "22",
"ToPort": "22",
"CidrIp": "0.0.0.0/0"
}
],
"SecurityGroupEgress": [
{
"FromPort": "22",
"ToPort": "22",
"CidrIp": "0.0.0.0/0",
"IpProtocol": "tcp"
}
]
},
"Type": "AWS::EC2::SecurityGroup"
}
}
}
Code samples without security vulnerabilities¶
Negative test num. 1 - yaml file
Parameters:
KeyName:
Description: The EC2 Key Pair to allow SSH access to the instance
Type: 'AWS::EC2::KeyPair::KeyName'
Resources:
Ec2Instance:
Type: 'AWS::EC2::Instance'
Properties:
SecurityGroups:
- !Ref InstanceSecurityGroup
- MyExistingSecurityGroup
KeyName: !Ref KeyName
ImageId: ami-7a11e213
InstanceSecurityGroup:
Type: 'AWS::EC2::SecurityGroup'
Properties:
GroupName: default
GroupDescription: Enable SSH access via port 22
Negative test num. 2 - json file
{
"Parameters": {
"KeyName": {
"Description": "The EC2 Key Pair to allow SSH access to the instance",
"Type": "AWS::EC2::KeyPair::KeyName"
}
},
"Resources": {
"Ec2Instance": {
"Type": "AWS::EC2::Instance",
"Properties": {
"SecurityGroups": [
"InstanceSecurityGroup",
"MyExistingSecurityGroup"
],
"KeyName": "KeyName",
"ImageId": "ami-7a11e213"
}
},
"InstanceSecurityGroup": {
"Type": "AWS::EC2::SecurityGroup",
"Properties": {
"GroupName": "default",
"GroupDescription": "Enable SSH access via port 22"
}
}
}
}