/
aws_security_group_tightly_restricts_outbound_traffic.yml
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/
aws_security_group_tightly_restricts_outbound_traffic.yml
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AnalysisType: policy
Filename: aws_security_group_tightly_restricts_outbound_traffic.py
PolicyID: "AWS.SecurityGroup.TightlyRestrictsOutboundTraffic"
DisplayName: "AWS Security Group Tightly Restricts Outbound Traffic"
Enabled: true
ResourceTypes:
- AWS.EC2.SecurityGroup
Tags:
- AWS
- PCI
- Exfiltration:Exfiltration Over Web Service
Reports:
PCI:
- 1.1.4
MITRE ATT&CK:
- TA0010:T1567
Severity: Medium
Description: >
This policy validates that Security Groups have restrictive controls on outbound traffic.
Runbook: >
Add appropriate restrictions to outbound traffic on Security Groups via IP permissions
Reference: https://docs.aws.amazon.com/cli/latest/userguide/cli-services-ec2-sg.html
Tests:
- Name: Security Group Tightly Restricts Outbound Traffic
ExpectedResult: true
Resource:
{
"Description": "example VPC security group",
"GroupId": "sg-abc123",
"GroupName": "default",
"IpPermissions":
[
{
"FromPort": null,
"IpProtocol": "-1",
"IpRanges": null,
"Ipv6Ranges": null,
"PrefixListIds": null,
"ToPort": null,
"UserIdGroupPairs":
[
{
"Description": null,
"GroupId": "sg-def123",
"GroupName": null,
"PeeringStatus": null,
"UserId": "123456789012",
"VpcId": null,
"VpcPeeringConnectionId": null,
},
],
},
],
"IpPermissionsEgress":
[
{
"FromPort": 2222,
"IpProtocol": "-1",
"IpRanges": [{ "CidrIp": "0.0.0.0/0", "Description": null }],
"Ipv6Ranges": null,
"PrefixListIds": null,
"ToPort": 2222,
"UserIdGroupPairs": null,
},
],
"OwnerId": "123456789012",
"Tags": { "environment": "pci" },
"VpcId": "vpc-abc111222333",
}
- Name: Security Group Does Not Restrict Outbound Traffic
ExpectedResult: false
Resource:
{
"Description": "example VPC security group",
"GroupId": "sg-abc123",
"GroupName": "default",
"IpPermissions":
[
{
"FromPort": null,
"IpProtocol": "-1",
"IpRanges": null,
"Ipv6Ranges": null,
"PrefixListIds": null,
"ToPort": null,
"UserIdGroupPairs":
[
{
"Description": null,
"GroupId": "sg-def123",
"GroupName": null,
"PeeringStatus": null,
"UserId": "123456789012",
"VpcId": null,
"VpcPeeringConnectionId": null,
},
],
},
],
"IpPermissionsEgress":
[
{
"FromPort": null,
"IpProtocol": "-1",
"IpRanges": [{ "CidrIp": "0.0.0.0/0", "Description": null }],
"Ipv6Ranges": null,
"PrefixListIds": null,
"ToPort": null,
"UserIdGroupPairs": null,
},
],
"OwnerId": "123456789012",
"Tags": { "environment": "pci" },
"VpcId": "vpc-abc111222333",
}
- Name: Security Group Does Not Tightly Restrict Outbound Traffic
ExpectedResult: false
Resource:
{
"Description": "example VPC security group",
"GroupId": "sg-abc123",
"GroupName": "default",
"IpPermissions":
[
{
"FromPort": null,
"IpProtocol": "-1",
"IpRanges": null,
"Ipv6Ranges": null,
"PrefixListIds": null,
"ToPort": null,
"UserIdGroupPairs":
[
{
"Description": null,
"GroupId": "sg-def123",
"GroupName": null,
"PeeringStatus": null,
"UserId": "123456789012",
"VpcId": null,
"VpcPeeringConnectionId": null,
},
],
},
],
"IpPermissionsEgress":
[
{
"FromPort": 80,
"IpProtocol": "-1",
"IpRanges": [{ "CidrIp": "0.0.0.0/0", "Description": null }],
"Ipv6Ranges": null,
"PrefixListIds": null,
"ToPort": 443,
"UserIdGroupPairs": null,
},
],
"OwnerId": "123456789012",
"Tags": { "environment": "pci" },
"VpcId": "vpc-abc111222333",
}