---
# System prepended metadata

title: XVIII. CVE-2021-3156
tags: [Env.Nw]

---

###### tags: `Env.Nw`
# XVIII. CVE-2021-3156

1. Download the Linux ubuntu 20.04.01 vmware image from [link](https://www.linuxvmimages.com/images/ubuntu-2004/#ubuntu-20041). 
2. Import the OS image to Vmware and then enter to OS. 
   - Default user/ pass is as ubuntu/ ubuntu
3. Download the PoC code from [link](https://github.com/CptGibbon/CVE-2021-3156)
4. Extract the CVE-2021-3156 PoC code
5. Update the APT package list at first using command as `apt update -y --fix-missing`
![](https://hackmd.io/_uploads/ryoRMPW8q.png)
6. Using the following command to install the dependency packages `apt install -y make gcc`
7. Switch to CVE-2021-3156 PoC code subfolder.
8. Compile the source code.
`make`
9. Using id command to retrive the current user status
![](https://hackmd.io/_uploads/r1XfVDb85.png)
10. exploit
![](https://hackmd.io/_uploads/r1nXNwZL5.png)


