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39 lines
2.2 KiB
Bash
39 lines
2.2 KiB
Bash
#!/usr/bin/env bash
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# Prowler - the handy cloud security tool (copyright 2019) by Toni de la Fuente
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may not
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# use this file except in compliance with the License. You may obtain a copy
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# of the License at http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software distributed
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# under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
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# CONDITIONS OF ANY KIND, either express or implied. See the License for the
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# specific language governing permissions and limitations under the License.
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CHECK_ID_check45="4.5"
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CHECK_TITLE_check45="[check45] Ensure no Network ACLs allow ingress from 0.0.0.0/0 to SSH port 22"
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CHECK_SCORED_check45="SCORED"
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CHECK_TYPE_check45="LEVEL2"
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CHECK_SEVERITY_check45="High"
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CHECK_ASFF_TYPE_check45="Software and Configuration Checks/Industry and Regulatory Standards/CIS AWS Foundations Benchmark"
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CHECK_ASFF_RESOURCE_TYPE_check45="AwsEc2NetworkACLs"
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CHECK_ALTERNATE_check401="check45"
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CHECK_SERVICENAME_check45="ec2"
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CHECK_RISK_check45='Even having a perimeter firewall; having network acls open allows any user or malware with vpc access to scan for well known and sensitive ports and gain access to instance.'
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CHECK_REMEDIATION_check45='Apply Zero Trust approach. Implement a process to scan and remediate unrestricted or overly permissive network acls. Recommended best practices is to narrow the definition for the minimum ports required.'
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CHECK_DOC_check45=''
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CHECK_CAF_EPIC_check45='Infrastructure Security'
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check45(){
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for regx in $REGIONS; do
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NACL_LIST=$($AWSCLI ec2 describe-network-acls --query 'NetworkAcls[?Entries[?(((!PortRange) || (PortRange.From<=`22` && PortRange.To>=`22`)) && ((CidrBlock == `0.0.0.0/0`) && (Egress == `false`) && (RuleAction == `allow`)))]].{NetworkAclId:NetworkAclId}' $PROFILE_OPT --region $regx --output text)
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if [[ $NACL_LIST ]];then
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for NACL in $NACL_LIST;do
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textInfo "$regx: Found Network ACL: $NACL open to 0.0.0.0/0 for SSH port 22" "$regx"
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done
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else
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textPass "$regx: No Network ACL found with SSH port 22 open to 0.0.0.0/0" "$regx"
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fi
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done
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}
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