DollhouseMCP

# Compact Context Handoff #3 - July 5, 2025 ## 🚨 URGENT SECURITY ISSUE **CRITICAL**: XSS vulnerability found in UpdateChecker requiring immediate fix (Issue #68) ## Current State - **Branch**: `main` (merged enhance/auto-update-testing) - **Last PR**: #67 merged (enhanced security tests) - **Urgent Issue**: #68 (critical security vulnerabilities) - **Status**: Security vulnerabilities identified, fixes needed ## What Just Happened 1. Implemented enhanced security testing for auto-update system 2. **DISCOVERED CRITICAL XSS VULNERABILITY** in UpdateChecker 3. Added comprehensive security test suite (30 tests) 4. Merged PR #67 establishing security baseline 5. Created Issue #68 for urgent security fixes ## 🔥 Critical Vulnerabilities Found ### 1. XSS Vulnerability (HIGH SEVERITY) **Location**: `src/update/UpdateChecker.ts:155` ```typescript // VULNERABLE CODE - NO SANITIZATION '**What\'s New:**\n' + result.releaseNotes + '\n\n' ``` **Impact**: Malicious release notes can inject HTML/JavaScript ### 2. Missing Parameter Validation (MEDIUM) **Location**: `src/update/UpdateChecker.ts:20-22` **Issue**: Constructor accepts null/undefined without validation ### 3. No URL Validation (MEDIUM) **Location**: `src/update/UpdateChecker.ts:158` **Issue**: `javascript:` and `data:` URLs not blocked ### 4. No Length Limits (LOW) **Issue**: 100KB+ release notes accepted without truncation ## Test Status - **UpdateManager.security.test.ts**: ✅ 15/15 PASSING - **UpdateChecker.security.test.ts**: ❌ 4/15 FAILING (vulnerabilities confirmed) ## Immediate Next Steps ### 1. FIX SECURITY VULNERABILITIES (URGENT) ```typescript // Required fixes for UpdateChecker: 1. Add input sanitization (DOMPurify or similar) 2. Add constructor validation 3. Add URL scheme validation 4. Implement consistent length limits ``` ### 2. Required Code Changes ```typescript // In UpdateChecker.ts import DOMPurify from 'isomorphic-dompurify'; constructor(versionManager: VersionManager) { if (!versionManager) throw new Error('VersionManager required'); this.versionManager = versionManager; } formatUpdateCheckResult(result: UpdateCheckResult) { if (result?.releaseNotes) { // Sanitize and truncate result.releaseNotes = DOMPurify.sanitize(result.releaseNotes, { ALLOWED_TAGS: [], ALLOWED_ATTR: [] }).substring(0, 5000); } // ... rest of method } ``` ### 3. Dependencies to Add ```bash npm install isomorphic-dompurify npm install --save-dev @types/dompurify ``` ## Quick Commands ```bash # Current status git status # On main branch npm test -- __tests__/unit/auto-update/UpdateChecker.security.test.ts # Shows failing tests # Start security fixes git checkout -b fix/security-vulnerabilities-updatechecker # Fix the vulnerabilities in src/update/UpdateChecker.ts # Run tests to verify fixes npm test -- __tests__/unit/auto-update/ # Create PR when fixed gh pr create --title "URGENT: Fix critical XSS vulnerability in UpdateChecker" ``` ## Test Files for Reference ``` __tests__/unit/auto-update/ ├── UpdateManager.security.test.ts # ✅ All security tests passing ├── UpdateChecker.security.test.ts # ❌ 4 tests failing (vulnerabilities) ├── UpdateManager.simple.test.ts # ✅ Basic integration tests ├── UpdateChecker.simple.test.ts # ✅ Basic formatting tests ├── BackupManager.simple.test.ts # ✅ File operations tests ├── DependencyChecker.simple.test.ts # ✅ System validation tests └── VersionManager.test.ts # ✅ Version comparison tests ``` ## Key Context ### Security Testing Success Enhanced testing immediately found real vulnerabilities, proving the value of security-focused test development. ### Vulnerability Details The XSS vulnerability allows malicious GitHub release notes to inject script tags or other dangerous content into the MCP server output. ### Fix Validation All security fixes must pass the failing tests in `UpdateChecker.security.test.ts`: - XSS sanitization test - Constructor validation test - URL scheme validation test - Length limit test ## Priority: CRITICAL This is a **HIGH SEVERITY** security vulnerability that needs immediate attention. The auto-update system could be exploited if a GitHub release contains malicious content. ## Success Metrics - All security tests in UpdateChecker.security.test.ts pass (currently 4 failing) - XSS vulnerability eliminated - Input validation implemented - Security baseline established ## Documentation Created - `ENHANCED_TESTING_SESSION_SUMMARY.md` - Complete session details - Issue #68 - Detailed vulnerability report and fix requirements - PR #67 - Security testing framework merged The enhanced testing framework is now in place and has successfully identified critical security vulnerabilities requiring urgent fixes.