VPC security group rules should not permit ingress from ‘0.0.0.0/0’ to TCP/UDP port 7001 (Cassandra)¶
Description¶
VPC security group rules should not permit ingress from ‘0.0.0.0/0’ to TCP/UDP port 7001 (Cassandra). Removing unfettered connectivity to a Cassandra server reduces the chance of exposing critical data.
Remediation Steps¶
AWS Console¶
Navigate to VPC.
In the left navigation pane, click Security Groups.
Remove any rules that include port 7001 and have a source of 0.0.0.0/0.
Click Save.
AWS CLI¶
List all security groups with an ingress rule of 0.0.0.0/0:
aws ec2 describe-security-groups --filters Name=ip-permission.cidr,Values='0.0.0.0/0' --query "SecurityGroups[*].{Name:GroupName,ID:GroupId}"
Remove the inbound rule(s) that permits unrestricted ingress to port 7001:
aws ec2 revoke-security-group-ingress --region <region> --group-name <group_name> --protocol tcp --port 7001 --cidr 0.0.0.0/0
Optionally add a more restrictive ingress rule to the selected Security Group:
aws ec2 authorize-security-group-ingress --region <region> --group-name <group_name> --protocol tcp --port 7001 --cidr <cidr_block>
Terraform¶
Ensure that an aws_security_group
ingress
block does NOT contain both of the following:A
0.0.0.0/0
in thecidr_blocks
field7001
is within the port range defined fromfrom_port
toto_port
, ORfrom_port
andto_port
are both set to0
Example Configuration¶
resource "aws_security_group" "example" {
ingress {
cidr_blocks = [10.0.0.0/16]
from_port = 7001
to_port = 7001
# other required fields here
}
}