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https://github.com/ghndrx/prowler.git
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87 lines
3.9 KiB
Bash
87 lines
3.9 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_extra778="7.78"
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CHECK_TITLE_extra778="[extra778] Find VPC security groups with wide-open public IPv4 CIDR ranges (non-RFC1918) "
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CHECK_SCORED_extra778="NOT_SCORED"
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CHECK_CIS_LEVEL_extra778="EXTRA"
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CHECK_SEVERITY_extra778="Medium"
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CHECK_ASFF_RESOURCE_TYPE_extra778="AwsEc2SecurityGroup"
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CHECK_ALTERNATE_check778="extra778"
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CHECK_SERVICENAME_extra778="ec2"
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CHECK_RISK_extra778='If Security groups are not properly configured the attack surface is increased. '
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CHECK_REMEDIATION_extra778='Use a Zero Trust approach. Narrow ingress traffic as much as possible. Consider north-south as well as east-west traffic.'
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CHECK_DOC_extra778='https://docs.aws.amazon.com/vpc/latest/userguide/VPC_SecurityGroups.html'
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CHECK_CAF_EPIC_extra778='Infrastructure Security'
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extra778(){
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CIDR_THRESHOLD=24
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RFC1918_REGEX="(^127\.)|(^10\.)|(^172\.1[6-9]\.)|(^172\.2[0-9]\.)|(^172\.3[0-1]\.)|(^192\.168\.)"
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check_cidr() {
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local SECURITY_GROUP=$1
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local DIRECTION=$2
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local DIRECTION_FILTER=""
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local REGION=$3
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case ${DIRECTION} in
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"inbound")
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DIRECTION_FILTER="IpPermissions"
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;;
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"outbound")
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DIRECTION_FILTER="IpPermissionsEgress"
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;;
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esac
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CIDR_IP_LIST=$(${AWSCLI} ec2 describe-security-groups \
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${PROFILE_OPT} \
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--filter "Name=group-id,Values=${SECURITY_GROUP}" \
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--query "SecurityGroups[*].${DIRECTION_FILTER}[*].IpRanges[*].CidrIp" \
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--region ${REGION} \
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--output text 2>&1| xargs )
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if [[ $(echo "$CIDR_IP_LIST" | grep -E 'AccessDenied|UnauthorizedOperation|AuthorizationError') ]]; then
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textInfo "$regx: Access Denied trying to describe security groups" "$regx"
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continue
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fi
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for CIDR_IP in ${CIDR_IP_LIST}; do
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if [[ ! ${CIDR_IP} =~ ${RFC1918_REGEX} ]]; then
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CIDR=$(echo ${CIDR_IP} | cut -d"/" -f2 | xargs)
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# Edge case "0.0.0.0/0" for RDP and SSH are checked already by check41 and check42
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if [[ ${CIDR} < ${CIDR_THRESHOLD} && 0 < ${CIDR} ]]; then
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textFail "${REGION}: ${SECURITY_GROUP} has potential wide-open non-RFC1918 address ${CIDR_IP} in ${DIRECTION} rule" "${REGION}" "${SECURITY_GROUP}"
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else
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textPass "${REGION}: ${SECURITY_GROUP} has no potential wide-open non-RFC1918 address" "${REGION}" "${SECURITY_GROUP}"
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fi
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fi
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done
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}
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for regx in ${REGIONS}; do
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SECURITY_GROUP_IDS=$(${AWSCLI} ec2 describe-security-groups \
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${PROFILE_OPT} \
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--region ${regx} \
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--query 'SecurityGroups[*].GroupId' \
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--output text 2>&1| xargs )
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if [[ $(echo "$SECURITY_GROUP_IDS" | grep -E 'AccessDenied|UnauthorizedOperation|AuthorizationError') ]]; then
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textInfo "$regx: Access Denied trying to describe security groups" "$regx"
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continue
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fi
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for SECURITY_GROUP in ${SECURITY_GROUP_IDS}; do
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check_cidr "${SECURITY_GROUP}" "inbound" "${regx}"
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check_cidr "${SECURITY_GROUP}" "outbound" "${regx}"
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done
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done
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}
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