| 제목 | Sipeed PicoClaw <= 0.2.9 Authentication Bypass by Capture-replay (CWE-294) |
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| 설명 | # Technical Details
A webhook replay vulnerability exists in the LINE channel in `pkg/channels/line/line.go` of PicoClaw.
The application fails to suppress duplicate LINE webhook events after signature verification. `webhook.ParseRequest` validates the HMAC signature, but the handler dispatches every parsed event without replay cache or idempotency checks keyed by the stable LINE `message.id`.
# Vulnerable Code
File: `pkg/channels/line/line.go`
Method: LINE webhook handler
Why: Validates the signature, returns `200 OK`, and dispatches every event asynchronously without replay suppression.
File: `pkg/channels/line/line.go`
Method: `processEvent`
Why: Copies the stable LINE `message.id` into `InboundContext.MessageID` but never checks whether that ID has already been processed.
# Reproduction
1. Capture or construct a valid signed LINE webhook body.
2. Send the same signed webhook delivery twice to PicoClaw's LINE webhook endpoint.
3. Observe both requests receive `200`.
4. Observe the internal collector records two inbound events with the same `message.id`.
5. Run a control with distinct message IDs and observe each distinct event produces one delivery.
# Impact
- Allows duplicate agent execution for a single LINE platform event.
- Can trigger repeated replies, repeated external tool actions, duplicated workflow transitions, and unnecessary LLM/API spend.
- Breaks the guarantee that one platform message maps to one internal action. |
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| 원천 | ⚠️ https://github.com/sipeed/picoclaw/issues/3073 |
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| 사용자 | Eric-i (UID 97584) |
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| 제출 | 2026. 06. 09. PM 01:29 (1 월 ago) |
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| 모더레이션 | 2026. 07. 17. PM 03:50 (1 month later) |
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| 상태 | 수락 |
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| VulDB 항목 | 379795 [Sipeed PicoClaw 까지 0.2.9 LINE Webhook line.go webhook.ParseRequest 약한 인증] |
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| 포인트들 | 20 |
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