vuln-mcp-filesystem-workspace-actions
Intentionally vulnerable MCP server for AI security pentesting training.
Exposes filesystem tools (read/write/list/execute) with deliberate path traversal and code execution vulnerabilities. The server accepts a workspace directory but path validation is naive — ../../../etc/passwd escapes the workspace.
DO NOT use in production. This is a training target.
Tools
| Tool | Vulnerability |
|---|---|
read_file |
Path traversal — reads any file on the filesystem |
write_file |
Path traversal — writes to any location the process can access |
list_directory |
Path traversal — lists any directory on the system |
execute_code |
Arbitrary Python code execution, no sandboxing |
Usage
# Run via uvx (after publishing to PyPI)
uvx vuln-mcp-filesystem-workspace-actions /path/to/workspace
# Or locally
python -m vuln_mcp_fs /path/to/workspace
MCP Client Configuration
.mcp.json:
{
"mcpServers": {
"vuln-filesystem": {
"command": "uvx",
"args": [
"vuln-mcp-filesystem-workspace-actions",
"/path/to/workspace"
]
}
}
}
Lab Exercises
- Path traversal: Ask the agent to
read_filewith path../../../etc/passwd - Write outside workspace:
write_fileto../../../tmp/pwned.txt - Code execution: Use
execute_codeto run__import__('os').system('id') - Chain attacks: Read
.envfiles, SSH keys, or AWS credentials from the host
1 maintainer
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