VPC security group rules should not permit ingress from ‘0.0.0.0/0’ to TCP/UDP port 11215 (Memcached SSL)¶
Description¶
VPC security group rules should not permit ingress from ‘0.0.0.0/0’ to TCP/UDP port 11215 (Memcached SSL). Removing unfettered connectivity to a Memcached SSL 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 11215 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 11215:
aws ec2 revoke-security-group-ingress --region <region> --group-name <group_name> --protocol <protocol> --port 11215 --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 <protocol> --port 11215 --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
field11215
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 = 11215
to_port = 11215
# other required fields here
}
}