AWS - STS Persistence

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STS

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AWS - STS Enum

Assume role token

Tymczasowych tokenów nie można wylistować, więc utrzymanie aktywnego tokenu tymczasowego jest sposobem na utrzymanie persistence.

aws sts get-session-token --duration-seconds 129600

# With MFA
aws sts get-session-token \
--serial-number  \
--token-code 

# Hardware device name is usually the number from the back of the device, such as GAHT12345678
# SMS device name is the ARN in AWS, such as arn:aws:iam::123456789012:sms-mfa/username
# Vritual device name is the ARN in AWS, such as arn:aws:iam::123456789012:mfa/username


Role Chain Juggling


Role chaining is an acknowledged AWS feature, często wykorzystywana do utrzymywania stealth persistence. Polega na możliwości assume a role which then assumes another, potencjalnie powracając do roli początkowej w cyclical manner. Za każdym razem, gdy rola zostanie assumed, pole expiration poświadczeń (credentials) jest odświeżane. W konsekwencji, jeśli dwie role są skonfigurowane tak, aby wzajemnie się assume’owały, rozwiązanie to umożliwia perpetual renewal of credentials.


Możesz użyć tego tool aby utrzymać role chaining:


./aws_role_juggler.py -h
usage: aws_role_juggler.py [-h] [-r ROLE_LIST [ROLE_LIST ...]]

optional arguments:
-h, --help            show this help message and exit
-r ROLE_LIST [ROLE_LIST ...], --role-list ROLE_LIST [ROLE_LIST ...]





Caution


Zwróć uwagę, że skrypt find_circular_trust.py z tego repozytorium Github nie znajduje wszystkich sposobów, w jakie łańcuch roli może być skonfigurowany.





Kod do przeprowadzenia Role Juggling przy użyciu PowerShell
```bash
# PowerShell script to check for role juggling possibilities using AWS CLI

Check for AWS CLI installation


if (-not (Get-Command “aws” -ErrorAction SilentlyContinue)) {
Write-Error “AWS CLI is not installed. Please install it and configure it with ‘aws configure’.”
exit
}


Function to list IAM roles


function List-IAMRoles {
aws iam list-roles –query “Roles[*].{RoleName:RoleName, Arn:Arn}” –output json
}


Initialize error count


$errorCount = 0


List all roles


$roles = List-IAMRoles | ConvertFrom-Json


Attempt to assume each role


foreach ($role in $roles) {
$sessionName = “RoleJugglingTest-” + (Get-Date -Format FileDateTime)
try {
$credentials = aws sts assume-role –role-arn $role.Arn –role-session-name $sessionName –query “Credentials” –output json 2>$null | ConvertFrom-Json
if ($credentials) {
Write-Host “Successfully assumed role: $($role.RoleName)”
Write-Host “Access Key: $($credentials.AccessKeyId)”
Write-Host “Secret Access Key: $($credentials.SecretAccessKey)”
Write-Host “Session Token: $($credentials.SessionToken)”
Write-Host “Expiration: $($credentials.Expiration)”


Set temporary credentials to assume the next role


$env:AWS_ACCESS_KEY_ID = $credentials.AccessKeyId
$env:AWS_SECRET_ACCESS_KEY = $credentials.SecretAccessKey
$env:AWS_SESSION_TOKEN = $credentials.SessionToken


Try to assume another role using the temporary credentials


foreach ($nextRole in $roles) {
if ($nextRole.Arn -ne $role.Arn) {
$nextSessionName = “RoleJugglingTest-” + (Get-Date -Format FileDateTime)
try {
$nextCredentials = aws sts assume-role –role-arn $nextRole.Arn –role-session-name $nextSessionName –query “Credentials” –output json 2>$null | ConvertFrom-Json
if ($nextCredentials) {
Write-Host “Also successfully assumed role: $($nextRole.RoleName) from $($role.RoleName)”
Write-Host “Access Key: $($nextCredentials.AccessKeyId)”
Write-Host “Secret Access Key: $($nextCredentials.SecretAccessKey)”
Write-Host “Session Token: $($nextCredentials.SessionToken)”
Write-Host “Expiration: $($nextCredentials.Expiration)”
}
} catch {
$errorCount++
}
}
}


Reset environment variables


Remove-Item Env:\AWS_ACCESS_KEY_ID
Remove-Item Env:\AWS_SECRET_ACCESS_KEY
Remove-Item Env:\AWS_SESSION_TOKEN
} else {
$errorCount++
}
} catch {
$errorCount++
}
}


Output the number of errors if any


if ($errorCount -gt 0) {
Write-Host “$errorCount error(s) occurred during role assumption attempts.”
} else {
Write-Host “No errors occurred. All roles checked successfully.”
}


Write-Host “Role juggling check complete.”


</details>

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