[STRIPE ANTI-FRAUD] SYSTEM AND PROTECTIONS BYPASS

[GENERAL DARK]

[align=center]
[size=medium]Target: api.stripe.com | Surface: Payments & Identity KYC[/size][/align]

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This report outlines the Inverted Security Pillars of the Stripe ecosystem, focusing on how untrusted input and state machine logic can be manipulated to bypass hardened primitives.

[size=large]PILLAR 1 — Hardware Taint Tracking (Inverted)[/size]
Backwards Probe: Can user-controlled data reach execution or logic-critical paths?

• PaymentIntent `amount`: Integer coercion boundary check.
• Metadata Fields: Freeform string "sinks" that reach downstream log parsers and webhooks unsanitized.
• KYC Binary Taint: Raw document upload bytes hitting OCR/ML pipelines without structural validation.

Taint Result: MODERATE — Schema types are enforced on primitives, but freeform fields are structurally untainted.

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[size=large]PILLAR 2 — Shadow Stack (Inverted)[/size]
Backwards Probe: Can API call sequences be chained out of order to alter state?

• Webhook Replay: Idempotency is consumer-enforced, creating a "return-to-libc" style re-execution of a logic branch (e.g., re-running `payment_intent.succeeded`).
• Card Testing: Chaining `create -> confirm -> cancel` gadgets to extract card validity data without triggering standard fraud signals.

Shadow Stack Result: HIGH RISK — State machine protections are often consumer-dependent rather than structurally enforced.

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[size=large]PILLAR 3 — Information Flow Control (IFC Sieve)[/size]
Backwards Probe: Can injected control characters alter downstream behavior?

Attack Surface	AegisFlow Backwards Finding
Document Upload	Binary Taint in ML pipelines; structural parser vulnerability.
Selfie & Liveness	Hardware isolation gap; adversarial pixel injection via virtual cameras.
PII Reports	Privilege escalation; PII retrievable via standard Secret Key without microkernel-style separation.

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[size=large]SUMMARY SCORECARD[/size]

Pillar                          | Gap Level | Primary Surface
--------------------------------|-----------|-------------------------
1. Taint Tracking               | MODERATE  | metadata, image pipelines
2. Shadow Stack                 | HIGH      | Webhook replay, card testing
3. IFC / Injection              | MODERATE  | Merchant-side flow
4. AST / Query Manipulation     | LOW-MOD   | expand[] tree, search DSL
5. seL4 Privilege               | MODERATE  | PII in identity reports

Systemic Verdict: Stripe is well-hardened at the core. Principal exposure exists in merchant-side webhook responsibility gaps and logic-level API call chain abuse.

[align=right]Generated via AEGIS[/align]

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[GENERAL DARK]

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