Checks whether the outbound rules of each security group allow access from all CIDR blocks. If not, the evaluation result is Compliant.
Scenarios
This rule applies when you need to configure a rule for a security group based on the principle of least privilege (PoLP). This helps you reduce network exposure and ensure the network security of cloud environments.
Risk level
Default risk level: high.
When you apply this rule, you can change the risk level based on your business requirements.
Compliance evaluation logic
- If the outbound rules of each security group do not allow access from all CIDR blocks, the evaluation result is Compliant.
- If the outbound rules of each security group allow access from all CIDR blocks, the evaluation result is Incompliant. For more information about how to remediate an incompliant configuration, see Incompliance remediation.
- This rule applies only to Elastic Compute Service (ECS). This rule does not apply
to other Alibaba Cloud services, such as Cloud Firewall (CFW) and NAT Gateway, or
security groups that are used by virtual network operators (VNOs).
Note Security groups that are created by using Alibaba Cloud services except ECS in managed mode are called managed security groups. For more information about managed security groups, see Managed security groups.
Rule details
| Item | Description |
|---|---|
| Rule name | ecs-security-group-egress-not-all-access |
| Rule identifier | ecs-security-group-egress-not-all-access |
| Tag | SecurityGroup |
| Automatic remediation | Not supported |
| Trigger Type | Configuration change |
| Supported resource type | ECS security group |
| Input parameter | None. |
Incompliance remediation
Modify a security group rule. For more information, see Modify security group rules.