| 제목 | Linux OpENer (Open EtherNet/IP Stack) lastet Use After Free |
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| 설명 | In the current master branch of OpENer, a stack‑use‑after‑return vulnerability exists in the TCP explicit‑message (SendRRData) processing path. The function `HandleDataOnTcpSocket()` stores the received EtherNet/IP packet into a local stack buffer (`incoming_message`). This buffer is then passed as a raw pointer through multiple layers: encapsulation parsing, CPF (Common Packet Format) parsing, and message routing. The CPF layer stores the pointer to the CIP payload (`data_item.data`) without copying the data to a separately managed storage area. Later, when the original stack frame has returned, the message router function `CreateMessageRouterRequestStructure()` dereferences this pointer (e.g., `*data`) to read the service byte. Because the stack memory has been reclaimed (the function `HandleDataOnTcpSocket()` has already returned when the socket event loop continues), this access causes an invalid memory read. AddressSanitizer reports the issue as `stack-use-after-return`, and the server crashes (denial of service). The vulnerability can be triggered remotely using a crafted `SendRRData` request and has been reproduced on the POSIX server build. |
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| 원천 | ⚠️ https://github.com/EIPStackGroup/OpENer/issues/566 |
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| 사용자 | QvuQ_lkx (UID 98260) |
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| 제출 | 2026. 05. 15. PM 03:04 (5 개월 ago) |
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| 모더레이션 | 2026. 06. 02. PM 07:42 (18 days later) |
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| 상태 | 수락 |
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| VulDB 항목 | 368016 [EIPStackGroup OpENer 까지 2.3.0 SendRRData cipmessagerouter.c CreateMessageRouterRequestStructure 메모리 손상] |
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| 포인트들 | 20 |
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