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# AWS - STS Persistence
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{{#include ../../../../banners/hacktricks-training.md}}
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## STS
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Pour plus d'informations, consultez :
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{{#ref}}
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../../aws-services/aws-sts-enum.md
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{{#endref}}
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### Assume role token
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Les jetons temporaires ne peuvent pas être listés, donc maintenir un jeton temporaire actif est un moyen de conserver la persistance.
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<pre class="language-bash"><code class="lang-bash">aws sts get-session-token --duration-seconds 129600
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# With MFA
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aws sts get-session-token \
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--serial-number <mfa-device-name> \
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--token-code <code-from-token>
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# Hardware device name is usually the number from the back of the device, such as GAHT12345678
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<strong># SMS device name is the ARN in AWS, such as arn:aws:iam::123456789012:sms-mfa/username
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</strong># Vritual device name is the ARN in AWS, such as arn:aws:iam::123456789012:mfa/username
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</code></pre>
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### Role Chain Juggling
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[**Role chaining is an acknowledged AWS feature**](https://docs.aws.amazon.com/IAM/latest/UserGuide/id_roles_terms-and-concepts.html#Role%20chaining), souvent utilisé pour maintenir une persistance furtive. Cela implique la capacité de **assume a role which then assumes another**, pouvant revenir au rôle initial de manière **cyclique**. Chaque fois qu'un rôle est assumé, le champ d'expiration des identifiants est rafraîchi. Par conséquent, si deux rôles sont configurés pour s'assumer mutuellement, cette configuration permet le renouvellement perpétuel des identifiants.
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Vous pouvez utiliser cet [**tool**](https://github.com/hotnops/AWSRoleJuggler/) pour maintenir le role chaining :
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```bash
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./aws_role_juggler.py -h
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usage: aws_role_juggler.py [-h] [-r ROLE_LIST [ROLE_LIST ...]]
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optional arguments:
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-h, --help show this help message and exit
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-r ROLE_LIST [ROLE_LIST ...], --role-list ROLE_LIST [ROLE_LIST ...]
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```
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> [!CAUTION]
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> Notez que le script [find_circular_trust.py](https://github.com/hotnops/AWSRoleJuggler/blob/master/find_circular_trust.py) de ce dépôt Github ne trouve pas toutes les façons dont une chaîne de rôles peut être configurée.
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<details>
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<summary>Code pour effectuer du Role Juggling depuis PowerShell</summary>
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```bash
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# PowerShell script to check for role juggling possibilities using AWS CLI
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# Check for AWS CLI installation
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if (-not (Get-Command "aws" -ErrorAction SilentlyContinue)) {
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Write-Error "AWS CLI is not installed. Please install it and configure it with 'aws configure'."
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exit
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}
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# Function to list IAM roles
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function List-IAMRoles {
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aws iam list-roles --query "Roles[*].{RoleName:RoleName, Arn:Arn}" --output json
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}
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# Initialize error count
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$errorCount = 0
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# List all roles
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$roles = List-IAMRoles | ConvertFrom-Json
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# Attempt to assume each role
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foreach ($role in $roles) {
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$sessionName = "RoleJugglingTest-" + (Get-Date -Format FileDateTime)
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try {
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$credentials = aws sts assume-role --role-arn $role.Arn --role-session-name $sessionName --query "Credentials" --output json 2>$null | ConvertFrom-Json
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if ($credentials) {
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Write-Host "Successfully assumed role: $($role.RoleName)"
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Write-Host "Access Key: $($credentials.AccessKeyId)"
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Write-Host "Secret Access Key: $($credentials.SecretAccessKey)"
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Write-Host "Session Token: $($credentials.SessionToken)"
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Write-Host "Expiration: $($credentials.Expiration)"
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# Set temporary credentials to assume the next role
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$env:AWS_ACCESS_KEY_ID = $credentials.AccessKeyId
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$env:AWS_SECRET_ACCESS_KEY = $credentials.SecretAccessKey
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$env:AWS_SESSION_TOKEN = $credentials.SessionToken
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# Try to assume another role using the temporary credentials
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foreach ($nextRole in $roles) {
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if ($nextRole.Arn -ne $role.Arn) {
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$nextSessionName = "RoleJugglingTest-" + (Get-Date -Format FileDateTime)
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try {
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$nextCredentials = aws sts assume-role --role-arn $nextRole.Arn --role-session-name $nextSessionName --query "Credentials" --output json 2>$null | ConvertFrom-Json
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if ($nextCredentials) {
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Write-Host "Also successfully assumed role: $($nextRole.RoleName) from $($role.RoleName)"
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Write-Host "Access Key: $($nextCredentials.AccessKeyId)"
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Write-Host "Secret Access Key: $($nextCredentials.SecretAccessKey)"
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Write-Host "Session Token: $($nextCredentials.SessionToken)"
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Write-Host "Expiration: $($nextCredentials.Expiration)"
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}
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} catch {
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$errorCount++
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}
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}
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}
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# Reset environment variables
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Remove-Item Env:\AWS_ACCESS_KEY_ID
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Remove-Item Env:\AWS_SECRET_ACCESS_KEY
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Remove-Item Env:\AWS_SESSION_TOKEN
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} else {
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$errorCount++
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}
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} catch {
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$errorCount++
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}
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}
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# Output the number of errors if any
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if ($errorCount -gt 0) {
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Write-Host "$errorCount error(s) occurred during role assumption attempts."
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} else {
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Write-Host "No errors occurred. All roles checked successfully."
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}
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Write-Host "Role juggling check complete."
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```
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</details>
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{{#include ../../../../banners/hacktricks-training.md}}
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