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New check for Metadata Service Version 2 #413

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Toni de la Fuente
2020-04-07 16:46:46 +02:00
parent b5e1c9002a
commit bd432fed92
2 changed files with 53 additions and 1 deletions
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52
checks/check_extra786 Normal file
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@@ -0,0 +1,52 @@
#!/usr/bin/env bash
# Prowler - the handy cloud security tool (copyright 2020) by Toni de la Fuente
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may not
# use this file except in compliance with the License. You may obtain a copy
# of the License at http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software distributed
# under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
# CONDITIONS OF ANY KIND, either express or implied. See the License for the
# specific language governing permissions and limitations under the License.
CHECK_ID_extra786="7.86"
CHECK_TITLE_extra786="[extra786] Check if EC2 Instance Metadata Service Version 2 (IMDSv2) is Enabled and Required (Not Scored) (Not part of CIS benchmark)"
CHECK_SCORED_extra786="NOT_SCORED"
CHECK_TYPE_extra786="EXTRA"
CHECK_ALTERNATE_check770="extra786"
extra786(){
for regx in $REGIONS; do
TEMP_EXTRA786_FILE=$(mktemp -t prowler-${ACCOUNT_NUM}-es-domain.EXTRA779.XXXXXXXXXX)
$AWSCLI ec2 describe-instances $PROFILE_OPT --region $regx \
--query 'Reservations[*].Instances[*].{HttpTokens:MetadataOptions.HttpTokens,HttpEndpoint:MetadataOptions.HttpEndpoint,InstanceId:InstanceId}' \
--output text --max-items $MAXITEMS > $TEMP_EXTRA786_FILE
# if the file contains data, there are instances in that region
if [[ -s "$TEMP_EXTRA786_FILE" ]];then
# here we read content from the file fields instanceid httptokens_status httpendpoint
while read httpendpoint httptokens_status instanceid ; do
#echo i:$instanceid tok:$httptokens_status end:$httpendpoint
if [[ "$httpendpoint" == "enabled" && "$httptokens_status" == "required" ]];then
textPass "$regx: EC2 Instance $instanceid has IMDSv2 enabled and required" "$regx"
elif [[ "$httpendpoint" == "disabled" ]];then
textInfo "$regx: EC2 Instance $instanceid has HTTP endpoint access to metadata service disabled" "$regx"
else
textFail "$regx: EC2 Instance $instanceid has IMDSv2 disabled or not required" "$regx"
fi
done < <(cat $TEMP_EXTRA786_FILE)
else
textInfo "$regx: no EC2 Instances found" "$regx"
fi
rm -fr $TEMP_EXTRA786_FILE
done
}
# Remediation:
# aws ec2 modify-instance-metadata-options \
# --instance-id i-1234567898abcdef0 \
# --http-tokens required \
# --http-endpoint enabled
# More information here https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/configuring-instance-metadata-service.html

2
groups/group7_extras
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@@ -15,7 +15,7 @@ GROUP_ID[7]='extras'
GROUP_NUMBER[7]='7.0'
GROUP_TITLE[7]='Extras - all non CIS specific checks - [extras] ****************'
GROUP_RUN_BY_DEFAULT[7]='Y' # run it when execute_all is called
GROUP_CHECKS[7]='extra71,extra72,extra73,extra74,extra75,extra76,extra77,extra78,extra79,extra710,extra711,extra712,extra713,extra714,extra715,extra716,extra717,extra718,extra719,extra720,extra721,extra722,extra723,extra724,extra725,extra726,extra727,extra728,extra729,extra730,extra731,extra732,extra733,extra734,extra735,extra736,extra737,extra738,extra739,extra740,extra741,extra742,extra743,extra744,extra745,extra746,extra747,extra748,extra749,extra750,extra751,extra752,extra753,extra754,extra755,extra756,extra757,extra758,extra761,extra762,extra763,extra764,extra765,extra767,extra768,extra769,extra770,extra771,extra772,extra773,extra774,extra775,extra776,extra777,extra778,extra779,extra780,extra781,extra782,extra783,extra784,extra785'
GROUP_CHECKS[7]='extra71,extra72,extra73,extra74,extra75,extra76,extra77,extra78,extra79,extra710,extra711,extra712,extra713,extra714,extra715,extra716,extra717,extra718,extra719,extra720,extra721,extra722,extra723,extra724,extra725,extra726,extra727,extra728,extra729,extra730,extra731,extra732,extra733,extra734,extra735,extra736,extra737,extra738,extra739,extra740,extra741,extra742,extra743,extra744,extra745,extra746,extra747,extra748,extra749,extra750,extra751,extra752,extra753,extra754,extra755,extra756,extra757,extra758,extra761,extra762,extra763,extra764,extra765,extra767,extra768,extra769,extra770,extra771,extra772,extra773,extra774,extra775,extra776,extra777,extra778,extra779,extra780,extra781,extra782,extra783,extra784,extra785,extra786'
# Extras 759 and 760 (lambda variables and code secrets finder are not included)
# to run detect-secrets use `./prowler -g secrets`