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Security Vulnerability Detection - Implementation Summary

Overview

Implemented a heuristic-based security vulnerability detection system that analyzes Soroban smart contract transactions during replay to identify potential security issues.

Changes

New Files

  1. internal/security/detector.go - Core detection engine

    • Implements 6 vulnerability checks
    • Distinguishes between verified risks and heuristic warnings
    • Analyzes transaction envelopes, events, and logs

  2. internal/security/detector_test.go - Unit tests

    • Tests for each vulnerability type
    • Edge case coverage
    • Multiple findings scenarios

  3. internal/security/integration_test.go - Integration tests

    • Flawed contract simulation
    • Type distinction verification
    • End-to-end detection validation

  4. internal/security/example_test.go - Usage examples

    • Demonstrates API usage
    • Serves as documentation

  5. internal/security/README.md - Comprehensive documentation

    • Feature descriptions
    • Usage guide
    • Extension guidelines

Modified Files

  1. internal/cmd/debug.go
    • Integrated security detector into debug command
    • Added formatted security analysis output
    • Displays verified risks and heuristic warnings separately

Features Implemented

Vulnerability Detection

1. Integer Overflow/Underflow (VERIFIED_RISK)

  • Detects arithmetic failures in logs
  • Keywords: overflow, underflow, checked_add, checked_sub, checked_mul
  • Severity: HIGH

2. Large Value Transfers (HEURISTIC_WARNING)

  • Native XLM: > 1M XLM threshold
  • Contract tokens: > 10M tokens threshold
  • Severity: HIGH/MEDIUM

3. Reentrancy Patterns (HEURISTIC_WARNING)

  • Multiple contract invocations with state changes
  • Severity: MEDIUM

4. Authorization Failures (VERIFIED_RISK)

  • Failed auth checks in events
  • Severity: HIGH

5. Authorization Bypass (HEURISTIC_WARNING)

  • Privileged operations without auth checks
  • Severity: HIGH

6. Contract Panics/Traps (VERIFIED_RISK)

  • Contract execution panics
  • Severity: HIGH

Finding Types

VERIFIED_RISK: Confirmed security issues with concrete evidence

  • Integer overflow/underflow
  • Authorization failures
  • Contract panics

HEURISTIC_WARNING: Potential concerns based on patterns

  • Large value transfers
  • Reentrancy patterns
  • Authorization bypass patterns

CLI Output Example

=== Security Analysis ===
⚠️  VERIFIED SECURITY RISKS: 2
⚡ HEURISTIC WARNINGS: 1

Findings:

1. ⚠️ [VERIFIED_RISK] HIGH - Integer Overflow/Underflow Detected
   Arithmetic operation failed, indicating potential overflow or underflow
   Evidence: checked_add failed: overflow detected

2. ⚡ [HEURISTIC_WARNING] HIGH - Large Value Transfer Detected
   Transfer of 200000000000000 stroops (20000000.00 XLM) detected. Verify recipient address.
   Evidence: Destination: GBRPYHIL2CI3FNQ4BXLFMNDLFJUNPU2HY3ZMFSHONUCEOASW7QC7OX2H

3. ⚡ [HEURISTIC_WARNING] HIGH - Potential Authorization Bypass
   Privileged operation detected without corresponding authorization check
   Evidence: Review contract authorization logic

Testing

All tests pass:

$ go test ./internal/security/... -v
PASS
ok      github.com/dotandev/hintents/internal/security  0.005s

Test Coverage

  • ✅ Individual vulnerability detection
  • ✅ Multiple findings in single transaction
  • ✅ Flawed contract simulation
  • ✅ Type distinction (verified vs heuristic)
  • ✅ No false positives on clean execution
  • ✅ Edge cases and error handling

Usage

Programmatic

import "github.com/dotandev/hintents/internal/security"

detector := security.NewDetector()
findings := detector.Analyze(envelopeXdr, resultMetaXdr, events, logs)

for _, finding := range findings {
    fmt.Printf("[%s] %s - %s\n", finding.Type, finding.Severity, finding.Title)
}

CLI

./erst debug <transaction-hash>

Security analysis is automatically included in the output.

Success Criteria Met

✅ CLI emits "Security Warning" for suspicious patterns

  • Implemented with clear distinction between verified risks (⚠️) and heuristic warnings (⚡)

✅ Integrate rule-based checkers

  • 6 vulnerability checks implemented
  • Pattern-based detection for common attack vectors

✅ Analyze event logs and state changes

  • Events analyzed for auth failures, panics, state changes
  • Logs analyzed for overflow, privileged operations

✅ Test against flawed contract

  • Integration test simulates flawed contract
  • Verifies all major vulnerability types detected

✅ Clearly differentiate risk types

  • VERIFIED_RISK: Confirmed issues with evidence
  • HEURISTIC_WARNING: Potential concerns requiring review
  • Visual distinction in CLI output (⚠️ vs ⚡)

Future Enhancements

  • Configurable thresholds via CLI flags
  • Custom rule definitions
  • Integration with vulnerability databases
  • Machine learning-based detection
  • Source code mapping for findings

Dependencies

No new external dependencies added. Uses existing:

  • github.com/stellar/go/xdr - XDR parsing
  • Standard library - String matching, big integers

Documentation

  • Comprehensive README in internal/security/
  • Inline code documentation
  • Example tests for API usage
  • Integration guide in main README (to be added)