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60 lines
3.1 KiB
Bash
60 lines
3.1 KiB
Bash
#!/usr/bin/env bash
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# Prowler - the handy cloud security tool (copyright 2020) 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_extra786="7.86"
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CHECK_TITLE_extra786="[extra786] Check if EC2 Instance Metadata Service Version 2 (IMDSv2) is Enabled and Required "
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CHECK_SCORED_extra786="NOT_SCORED"
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CHECK_TYPE_extra786="EXTRA"
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CHECK_SEVERITY_extra786="Medium"
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CHECK_ASFF_RESOURCE_TYPE_extra786="AwsEc2Instance"
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CHECK_ALTERNATE_check786="extra786"
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CHECK_SERVICENAME_extra786="ec2"
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CHECK_RISK_extra786='Using IMDSv2 will protect from misconfiguration and SSRF vulnerabilities. IMDSv1 will not.'
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CHECK_REMEDIATION_extra786='If you don’t need IMDS you can turn it off. Using aws-cli you can force the instance to use only IMDSv2.'
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CHECK_DOC_extra786='https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/configuring-instance-metadata-service.html#configuring-instance-metadata-options'
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CHECK_CAF_EPIC_extra786='Infrastructure Security'
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extra786(){
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for regx in $REGIONS; do
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TEMP_EXTRA786_FILE=$(mktemp -t prowler-${ACCOUNT_NUM}-es-domain.EXTRA786.XXXXXXXXXX)
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$AWSCLI ec2 describe-instances $PROFILE_OPT --region $regx \
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--query 'Reservations[*].Instances[*].{HttpTokens:MetadataOptions.HttpTokens,HttpEndpoint:MetadataOptions.HttpEndpoint,InstanceId:InstanceId}' \
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--output text --max-items $MAXITEMS > $TEMP_EXTRA786_FILE
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# if the file contains data, there are instances in that region
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if [[ -s "$TEMP_EXTRA786_FILE" ]];then
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# here we read content from the file fields instanceid httptokens_status httpendpoint
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while read httpendpoint httptokens_status instanceid ; do
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#echo i:$instanceid tok:$httptokens_status end:$httpendpoint
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if [[ "$httpendpoint" == "enabled" && "$httptokens_status" == "required" ]];then
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textPass "$regx: EC2 Instance $instanceid has IMDSv2 enabled and required" "$regx" "$instanceid"
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elif [[ "$httpendpoint" == "disabled" ]];then
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textInfo "$regx: EC2 Instance $instanceid has HTTP endpoint access to metadata service disabled" "$regx"
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else
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textFail "$regx: EC2 Instance $instanceid has IMDSv2 disabled or not required" "$regx" "$instanceid"
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fi
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done < <(cat $TEMP_EXTRA786_FILE)
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else
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textInfo "$regx: no EC2 Instances found" "$regx"
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fi
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rm -fr $TEMP_EXTRA786_FILE
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done
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}
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# Remediation:
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# aws ec2 modify-instance-metadata-options \
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# --instance-id i-1234567898abcdef0 \
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# --http-tokens required \
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# --http-endpoint enabled
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# More information here https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/configuring-instance-metadata-service.html
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