Prisma Public Cloud Query - Exclude AWS security group that is not associated with any resources

[DXiao]

Hi,

Some policies are producing alerts against SGs that are not associated with any resources.

Can you please advise how to customize the query and exclude those SGs? 

For example, policy "AWS Security Groups allow internet traffic from internet to MYSQL port (3306)"  is defined as follows:

config where cloud.type = 'aws' AND api.name='aws-ec2-describe-security-groups' AND json.rule = (((ipPermissions[?(@.toPort > 3306 && @.fromPort < 3306)].ipRanges[*] contains 0.0.0.0/0) or (ipPermissions[?(@.toPort == 3306 || @.fromPort == 3306)].ipRanges[*] contains 0.0.0.0/0)) or ((ipPermissions[?(@.toPort > 3306 && @.fromPort < 3306)].ipv6Ranges[*].cidrIpv6 contains ::/0) or (ipPermissions[?(@.toPort == 3306 || @.fromPort == 3306)].ipv6Ranges[*].cidrIpv6 contains ::/0)))

Thank you

[kchen · Accepted solution]

There isn't a way to exclude SGs attached to any kind of resources, but you can at least put in a few more restrictions.  For example, the below query will return all security groups that are open to the public on port 22 that are on a VPC which contains an IGW with an EC2 instance attached.

config where api.name = 'aws-ec2-describe-security-groups' as X; config where api.name = 'aws-ec2-describe-internet-gateways' as Y; config where api.name = 'aws-ec2-describe-instances' as Z; filter '$.Z.securityGroups[*].groupId contains $.X.groupId and $.Y.attachments[*].vpcId contains $.X.vpcId and ($.X.ipPermissions[?(@.toPort==22||@.fromPort==22)].ipv6Ranges[*].cidrIpv6 contains ::/0 or $.X.ipPermissions[?(@.toPort==22||@.fromPort==22)].ipRanges[*] contains 0.0.0.0/0 or $.X.ipPermissions[?(@.toPort>22&&@.fromPort<22)].ipv6Ranges[*].cidrIpv6 contains ::/0 or $.X.ipPermissions[?(@.toPort>22&&@.fromPort<22)].ipRanges[*] contains 0.0.0.0/0)'; show X;

Hope this helps.