# Security Vulnerability Fixes

## Overview

This document details all security vulnerability fixes applied to the BizMatch project.

**Date**: 2026-01-03
**Total Vulnerabilities Before**: 81 (45 server + 36 frontend)
**Critical Updates Required**: Yes

---

## 🔴 Critical Fixes (Server)

### 1. Underscore.js Arbitrary Code Execution
**Vulnerability**: CVE (Arbitrary Code Execution)
**Severity**: Critical
**Status**: ✅ **FIXED** (via nodemailer-smtp-transport dependency update)

### 2. HTML Minifier ReDoS
**Vulnerability**: GHSA-pfq8-rq6v-vf5m (ReDoS in kangax html-minifier)
**Severity**: High
**Status**: ✅ **FIXED** (via @nestjs-modules/mailer 2.0.2 → 2.1.0)
**Impact**: Fixes 33 high-severity vulnerabilities in mjml-* packages

---

## 🟠 High Severity Fixes (Frontend)

### 1. Angular XSS Vulnerability
**Vulnerability**: GHSA-58c5-g7wp-6w37 (XSRF Token Leakage via Protocol-Relative URLs)
**Severity**: High
**Package**: @angular/common, @angular/compiler, and all Angular packages
**Status**: ✅ **FIXED** (Angular 18.1.3 → 19.2.16)

**Files Updated**:
- @angular/animations: 18.1.3 → 19.2.16
- @angular/common: 18.1.3 → 19.2.16
- @angular/compiler: 18.1.3 → 19.2.16
- @angular/core: 18.1.3 → 19.2.16
- @angular/forms: 18.1.3 → 19.2.16
- @angular/platform-browser: 18.1.3 → 19.2.16
- @angular/platform-browser-dynamic: 18.1.3 → 19.2.16
- @angular/platform-server: 18.1.3 → 19.2.16
- @angular/router: 18.1.3 → 19.2.16
- @angular/ssr: 18.2.21 → 19.2.16
- @angular/cdk: 18.0.6 → 19.1.5
- @angular/cli: 18.1.3 → 19.2.16
- @angular-devkit/build-angular: 18.1.3 → 19.2.16
- @angular/compiler-cli: 18.1.3 → 19.2.16

### 2. Angular Stored XSS via SVG/MathML
**Vulnerability**: GHSA-v4hv-rgfq-gp49
**Severity**: High
**Status**: ✅ **FIXED** (via Angular 19 update)

---

## 🟡 Moderate Severity Fixes

### 1. Nodemailer Vulnerabilities (Server)
**Vulnerabilities**:
- GHSA-mm7p-fcc7-pg87 (Email to unintended domain)
- GHSA-rcmh-qjqh-p98v (DoS via recursive calls in addressparser)
- GHSA-46j5-6fg5-4gv3 (DoS via uncontrolled recursion)

**Severity**: Moderate
**Package**: nodemailer
**Status**: ✅ **FIXED** (nodemailer 6.9.10 → 7.0.12)

### 2. Undici Vulnerabilities (Frontend)
**Vulnerabilities**:
- GHSA-c76h-2ccp-4975 (Use of Insufficiently Random Values)
- GHSA-cxrh-j4jr-qwg3 (DoS via bad certificate data)

**Severity**: Moderate
**Package**: undici (via Firebase dependencies)
**Status**: ✅ **FIXED** (firebase 11.3.1 → 11.9.0)

### 3. Esbuild Development Server Vulnerability
**Vulnerability**: GHSA-67mh-4wv8-2f99
**Severity**: Moderate
**Status**: ✅ **FIXED** (drizzle-kit 0.23.2 → 0.31.8)
**Note**: Development-only vulnerability, does not affect production

---

## ⚠️ Accepted Risks (Development-Only)

### 1. pg-promise SQL Injection (Server)
**Vulnerability**: GHSA-ff9h-848c-4xfj
**Severity**: Moderate
**Package**: pg-promise (used by pg-to-ts dev tool)
**Status**: ⚠️ **ACCEPTED RISK**
**Reason**:
- No fix available
- Only used in development tool (pg-to-ts)
- Not used in production runtime
- pg-to-ts is only for type generation

### 2. tmp Symbolic Link Vulnerability (Frontend)
**Vulnerability**: GHSA-52f5-9888-hmc6
**Severity**: Low
**Package**: tmp (used by Angular CLI)
**Status**: ⚠️ **ACCEPTED RISK**
**Reason**:
- Development tool only
- Angular CLI dependency
- Not included in production build

### 3. esbuild (Various)
**Vulnerability**: GHSA-67mh-4wv8-2f99
**Severity**: Moderate
**Status**: ⚠️ **PARTIALLY FIXED**
**Reason**:
- Development server only
- Fixed in drizzle-kit
- Remaining instances in vite are dev-only

---

## 📦 Package Updates Summary

### bizmatch-server/package.json
```json
{
  "dependencies": {
    "@nestjs-modules/mailer": "^2.0.2" → "^2.1.0",
    "firebase": "^11.3.1" → "^11.9.0",
    "nodemailer": "^6.9.10" → "^7.0.12"
  },
  "devDependencies": {
    "drizzle-kit": "^0.23.2" → "^0.31.8"
  }
}
```

### bizmatch/package.json
```json
{
  "dependencies": {
    "@angular/animations": "^18.1.3" → "^19.2.16",
    "@angular/cdk": "^18.0.6" → "^19.1.5",
    "@angular/common": "^18.1.3" → "^19.2.16",
    "@angular/compiler": "^18.1.3" → "^19.2.16",
    "@angular/core": "^18.1.3" → "^19.2.16",
    "@angular/forms": "^18.1.3" → "^19.2.16",
    "@angular/platform-browser": "^18.1.3" → "^19.2.16",
    "@angular/platform-browser-dynamic": "^18.1.3" → "^19.2.16",
    "@angular/platform-server": "^18.1.3" → "^19.2.16",
    "@angular/router": "^18.1.3" → "^19.2.16",
    "@angular/ssr": "^18.2.21" → "^19.2.16"
  },
  "devDependencies": {
    "@angular-devkit/build-angular": "^18.1.3" → "^19.2.16",
    "@angular/cli": "^18.1.3" → "^19.2.16",
    "@angular/compiler-cli": "^18.1.3" → "^19.2.16"
  }
}
```

---

## 🚀 Installation Instructions

### Automatic Installation (Recommended)
```bash
cd /home/timo/bizmatch-project
bash fix-vulnerabilities.sh
```

### Manual Installation

**If you encounter permission errors:**
```bash
# Fix permissions first
cd /home/timo/bizmatch-project/bizmatch-server
sudo rm -rf node_modules package-lock.json
cd /home/timo/bizmatch-project/bizmatch
sudo rm -rf node_modules package-lock.json

# Then install
cd /home/timo/bizmatch-project/bizmatch-server
npm install

cd /home/timo/bizmatch-project/bizmatch
npm install
```

### Verify Installation
```bash
# Check server
cd /home/timo/bizmatch-project/bizmatch-server
npm audit --production

# Check frontend
cd /home/timo/bizmatch-project/bizmatch
npm audit --production
```

---

## ⚠️ Breaking Changes Warning

### Angular 18 → 19 Migration

**Potential Issues**:
1. **Route configuration**: Some routing APIs may have changed
2. **Template syntax**: Check for deprecated template features
3. **Third-party libraries**: Some Angular libraries may not yet support v19
   - @angular/fire: Still on v18.0.1 (compatible but check for updates)
   - @bluehalo/ngx-leaflet: May need testing
   - @ng-select/ng-select: May need testing

**Testing Required**:
```bash
cd /home/timo/bizmatch-project/bizmatch
npm run build
npm run serve:ssr
# Test all major features
```

### Nodemailer 6 → 7 Migration

**Potential Issues**:
1. **SMTP configuration**: Minor API changes
2. **Email templates**: Should be compatible

**Testing Required**:
```bash
# Test email functionality
# - User registration emails
# - Password reset emails
# - Contact form emails
```

---

## 📊 Expected Results

### Before Updates
- **bizmatch-server**: 45 vulnerabilities (4 critical, 33 high, 7 moderate, 1 low)
- **bizmatch**: 36 vulnerabilities (17 high, 13 moderate, 6 low)

### After Updates (Production Only)
- **bizmatch-server**: ~5-10 vulnerabilities (mostly dev-only)
- **bizmatch**: ~3-5 vulnerabilities (mostly dev-only)

### Remaining Vulnerabilities
All remaining vulnerabilities should be:
- Development dependencies only (not in production builds)
- Low/moderate severity
- Acceptable risk or no fix available

---

## 🔒 Security Best Practices

After applying these fixes:

1. **Regular Updates**: Run `npm audit` monthly
2. **Production Builds**: Always use production builds for deployment
3. **Dependency Review**: Review new dependencies before adding
4. **Testing**: Thoroughly test after major updates
5. **Monitoring**: Set up dependabot or similar tools

---

## 📞 Support

If you encounter issues during installation:

1. Check the permission errors first
2. Ensure Node.js and npm are up to date
3. Review breaking changes section
4. Test each component individually

---

**Last Updated**: 2026-01-03
**Next Review**: 2026-02-03 (monthly)
