# Security Audit Report - up-mcp-email

**Date:** 2024-12-16
**Auditor:** Claude (Wing Coding)
**Repository:** https://github.com/cobach/up-mcp-email
**Original Source:** https://github.com/ai-zerolab/mcp-email-server
**Version:** 0.0.1

---

## Executive Summary

This security audit was performed on the forked repository `up-mcp-email` (originally `mcp-email-server` by ai-zerolab) before integrating it into the ultraPRO ecosystem. The audit focused on identifying malicious behaviors, data exfiltration, backdoors, and security vulnerabilities.

**Result: PASSED** - No malicious code detected. The codebase is suitable for use after branding adjustments.

---

## Scope

### Files Reviewed

| File | Purpose | Lines |
|------|---------|-------|
| `pyproject.toml` | Dependencies and project config | 127 |
| `mcp_email_server/app.py` | MCP tools definition | 206 |
| `mcp_email_server/config.py` | Configuration management | 350 |
| `mcp_email_server/cli.py` | CLI commands | 51 |
| `mcp_email_server/emails/classic.py` | IMAP/SMTP client | 822 |
| `mcp_email_server/emails/dispatcher.py` | Handler dispatcher | 21 |
| `mcp_email_server/tools/installer.py` | Claude Desktop installer | 156 |
| `mcp_email_server/ui.py` | Gradio UI | ~200 |

### Search Patterns Used

```
# Dangerous code patterns
requests\.get|requests\.post|urllib|http\.client
socket\.|subprocess|os\.system
eval\(|exec\(|compile\(|__import__|importlib

# Network indicators
https?://|\.com|\.io|\.net
telemetry|analytics|tracking|phone.home
```

---

## Findings

### 1. Malicious Code Detection

| Check | Result | Notes |
|-------|--------|-------|
| Hardcoded malicious URLs | **NONE** | Only `example.com` placeholders in UI |
| Command injection vectors | **NONE** | No subprocess/os.system/eval/exec |
| Data exfiltration | **NONE** | No outbound connections except user-configured IMAP/SMTP |
| Backdoors | **NONE** | No hidden entry points |
| Obfuscated code | **NONE** | All code is readable and well-structured |
| Hidden telemetry | **NONE** | No analytics or tracking code |

### 2. Dependencies Analysis

All dependencies are well-known, maintained libraries:

| Dependency | Version | Purpose | Risk |
|------------|---------|---------|------|
| `aioimaplib` | >=2.0.1 | Async IMAP client | Low |
| `aiosmtplib` | >=4.0.0 | Async SMTP client | Low |
| `mcp[cli]` | >=1.3.0 | Official MCP SDK | Low |
| `pydantic` | >=2.11.0 | Data validation | Low |
| `pydantic-settings` | >=2.11.0 | Settings management | Low |
| `gradio` | >=6.0.1 | Web UI | Low |
| `typer` | >=0.15.1 | CLI framework | Low |
| `jinja2` | >=3.1.5 | Templating | Low |
| `loguru` | >=0.7.3 | Logging | Low |
| `tomli-w` | >=1.2.0 | TOML writing | Low |

**No suspicious or unknown dependencies found.**

### 3. Credential Handling

| Aspect | Implementation | Assessment |
|--------|----------------|------------|
| Storage location | `~/.config/zerolib/mcp_email_server/config.toml` | Local file, user-controlled |
| Encryption | Plain text in TOML | **Improvement needed** |
| API exposure | `masked()` function hides passwords | Good |
| Environment variables | Supported for sensitive data | Good |

### 4. Network Behavior

The application only connects to:
- **IMAP servers** configured by the user (for reading emails)
- **SMTP servers** configured by the user (for sending emails)

No connections to:
- External analytics services
- Third-party APIs
- Unknown servers

### 5. File System Access

| Operation | Scope | Protection |
|-----------|-------|------------|
| Config read/write | `~/.config/zerolib/` | User home only |
| Attachment download | User-specified path | Requires explicit `enable_attachment_download=true` |
| Attachment upload | User-specified paths | Validates file existence |

### 6. Permission Model

The application implements a conservative permission model:
- Attachment download is **disabled by default**
- Must be explicitly enabled via config or environment variable
- No automatic file execution

---

## Recommendations

### Before Production Use

1. **Rebrand paths and identifiers**
   - Change `zerolib` → `ultrapro` in config paths
   - Change `zerolib-email` → `up-mcp-email` in Claude integration
   - Update project metadata in `pyproject.toml`

2. **Consider credential encryption**
   - Current: Plain text TOML
   - Recommended: Integrate with ultraPRO Desktop's AES-256-GCM encryption

3. **Update default port**
   - Current: 9557
   - Consider: Align with ultraPRO ecosystem standards

### Code Quality Notes

- Well-structured async code
- Good error handling with logging
- Type hints throughout
- Test coverage present in `/tests`

---

## Conclusion

The `mcp-email-server` codebase by ai-zerolab is **safe for use**. It performs only the expected email operations (IMAP/SMTP) with user-configured servers and does not contain any malicious code, backdoors, or hidden functionality.

The code is ready for integration into the ultraPRO ecosystem after applying the recommended branding changes.

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**Audit performed by:** Claude (Opus 4.5) via Wing Coding methodology
**Authorized by:** César Obach / ultraBASE
