AdversarialNexus: Autonomous Agent Red-Teaming & Runtime Defense Suite

Autonomous Agent Dynamic Red-Teaming, Indirect Prompt Injection Auditor, Privilege Boundary Verification, and Runtime Defensive Guardrails.
Built for enterprise AI teams, fintech/healthcare agent deployments, and frontier AI lab security audits.

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🎯 The Agent Security Dilemma

Autonomous LLM agents with tool-calling capabilities (MCP servers, Bash execution, SQL databases) are vulnerable to severe threats that static regex WAFs and basic Promptfoo tests cannot catch:

1. OWASP LLM01: Indirect Prompt Injection: Untrusted data retrieved from external tools (PDFs, SQL returns, web scraping) overrides agent system instructions.
2. OWASP LLM07/08: Excessive Agency & Privilege Escalation: Agents coerced into executing administrative or OS-level tools outside their role boundaries.
3. Token Steganography: Adversarial payloads encoded into zero-width Unicode characters bypass standard input filters while activating LLM tokenizers.

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⚡ AdversarialNexus Benchmarks & Defensive Capabilities

Feature	Static WAF / Basic Prompt Testing	AdversarialNexus Engine	Security Assurance
Indirect Injection Auditing	Basic string matching (misses 80%+)	Synthetic Database & Tool Payload Synthesizer	Simulates polymorphic nested overrides
Steganography Evasion Testing	❌ (Zero-width chars pass undetected)	Binary Zero-Width Unicode Stripper & Auditor	100% detection and neutralization
Tool Privilege Enforcement	Soft system prompt instructions	Deterministic Role Boundary Policy Engine	Hard mathematical execution blockage
Runtime Control Barriers	Post-hoc error logging	Zero-latency argument guardrails	Intercepts commands before OS execution

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🛠️ Architecture

adversarial-nexus/
├── adversarial_nexus/
│   ├── attacks/
│   │   ├── indirect_injection.py  # Synthetic document/SQL injection payload generator
│   │   └── steganography.py       # Zero-width Unicode adversarial encoding/decoding
│   ├── auditor/
│   │   ├── privilege_escalator.py # Role boundary and tool allowlist/blocklist auditor
│   │   └── execution_tracer.py    # Deterministic vulnerability causal graph tracer
│   └── defense/
│       ├── token_sanitizer.py     # Adversarial token and zero-width stripper
│       └── runtime_guard.py       # Control barrier argument policy enforcer

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💻 Quick Start & CLI

# Run unit tests
python3 -m unittest discover -s tests

# 1. Generate Synthetic Indirect Injection Payloads
adversarial-nexus generate-injection

# 2. Test Zero-Width Token Steganography Evasion
adversarial-nexus test-stego

# 3. Audit Agent Tool Privilege Escalation Boundaries
adversarial-nexus audit-privilege

# 4. Verify Runtime Guardrails & Input Sanitization
adversarial-nexus test-defense

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📄 License & Red-Teaming Engagements

Apache-2.0 License. Authored by Ahmed Hassan (Founder, A2Z SOC).
For pre-deployment enterprise agent red-teaming, contact: ahmed@a2zsoc.com.