evaluate-iam-role.sh

This commit is contained in:
mgeeky 2019-12-03 16:34:06 +01:00
parent fa851ace46
commit 86d1f2931f
2 changed files with 81 additions and 0 deletions

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@ -93,6 +93,8 @@ Afterwards, one should see following logs in CloudWatch traces for planted Lambd
[*] Following S3 object could be removed: (Bucket=90112981864022885796153088027941100000000000000000000000, Key=cloudtrail/AWSLogs/712800000000/CloudTrail/us-west-2/2019/03/20/712800000000_CloudTrail_us-west-2_20190320T1000Z_oxxxxxxxxxxxxc.json.gz)
```
- **`evaluate-iam-role.sh`** - Enumerates attached IAM Role policies, goes through all of granted permissions and lists those that are known for Privilege Escalation risks. Based on [Rhino Security Labs work](https://rhinosecuritylabs.com/aws/aws-privilege-escalation-methods-mitigation/). [gist](https://gist.github.com/mgeeky/14685d94af7848e64afefe6fd2341a18)
- **`exfiltrateLambdaTasksDirectory.py`** - Script that creates an in-memory ZIP file from the entire directory `$LAMBDA_TASK_ROOT` (typically `/var/task`) and sends it out in a form of HTTP(S) POST request, within an `exfil` parameter. To be used for exfiltrating AWS Lambda's entire source code.
- **`get-session-creds-in-config-format.sh`** - Calls `aws sts assume-role` using MFA token in order to then retrieve session credentials and reformat it into `~/.aws/credentials` file format. Having that it's easy to copy-and-paste that script's output into credentials file. Then tools such as _s3tk_ that are unable to process MFA tokens may just use preconfigured profile creds.

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clouds/aws/evaluate-iam-role.sh Executable file
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#!/bin/bash
if [ $# -ne 2 ]; then
echo "Usage: evaluate-iam-role.sh <profile> <role-name>"
exit 1
fi
PROFILE=$1
ROLE_NAME=$2
known_dangerous_permissions=(
"iam:CreatePolicyVersion"
"iam:SetDefaultPolicyVersion"
"iam:PassRole"
"ec2:RunInstances"
"iam:CreateAccessKey"
"iam:CreateLoginProfile"
"iam:UpdateLoginProfile"
"iam:AttachUserPolicy"
"iam:AttachGroupPolicy"
"iam:AttachRolePolicy"
"iam:PutUserPolicy"
"iam:PutGroupPolicy"
"iam:PutRolePolicy"
"iam:AddUserToGroup"
"iam:UpdateAssumeRolePolicy"
"sts:AssumeRole"
"iam:PassRole"
"lambda:CreateFunction"
"lambda:InvokeFunction"
"lambda:CreateEventSourceMapping"
"lambda:UpdateFunctionCode"
"glue:CreateDevEndpoint"
"glue:UpdateDevEndpoint"
"cloudformation:CreateStack"
"datapipeline:CreatePipeline"
"datapipeline:PutPipelineDefinition"
)
role_policy=$(aws --profile $PROFILE iam get-role --role-name $ROLE_NAME)
echo -e "=============== Role: $ROLE_NAME ==============="
echo "$role_policy"
IFS=$'\n'
attached_role_policies=($(aws --profile $PROFILE iam list-attached-role-policies --role-name $ROLE_NAME | jq -r '.AttachedPolicies[].PolicyArn'))
dangerous_permissions=()
for policy in "${attached_role_policies[@]}" ; do
echo -e "\n=============== Attached Policy Arn: $policy ==============="
version_id=$(aws --profile $PROFILE iam get-policy --policy-arn $policy | jq -r '.Policy.DefaultVersionId')
policy_version=$(aws --profile $PROFILE iam get-policy-version --policy-arn $policy --version-id $version_id)
echo "$policy_version"
permissions=($(echo "$policy_version" | jq -r '.PolicyVersion.Document.Statement[].Action | if type=="string" then [.] else . end | .[]'))
effect=$(echo "$policy_version" | jq -r '.PolicyVersion.Document.Statement[].Effect' )
if [[ "$effect" == "Allow" ]]; then
for perm in "${permissions[@]}" ; do
for dangperm in "${known_dangerous_permissions[@]}"; do
if echo "$dangperm" | grep -iq $perm ; then
dangerous_permissions+=("$perm")
fi
done
done
fi
done
if [[ ${#dangerous_permissions[@]} -gt 0 ]]; then
echo -e "\n\n=============== Detected dangerous permissions granted ==============="
for dangperm in "${dangerous_permissions[@]}"; do
echo -e "\t$dangperm"
done
else
echo -e "\nNo dangerous permissions were found to be granted."
fi