| tiêu đề | Open5GS 2.7.6 Incorrect Authorization |
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| Mô tả | The AMF in Open5GS v2.7.6 (and main branch) resolves UE-associated NGAP messages by AMF-UE-NGAP-ID via a process-wide pool lookup (ran_ue_find_by_amf_ue_ngap_id in src/amf/context.c) without verifying that the message arrived on the SCTP/TNLA association bound to the resolved UE's serving gNB.
A second NG-RAN node that has completed its own NG Setup with the AMF can submit a single forged PDUSessionResourceSetupResponse carrying a victim UE's AMF-UE-NGAP-ID and an attacker-controlled GTP-U endpoint. The AMF accepts the message and forwards the supplied transfer to the SMF as Nsmf_PDUSession_UpdateSMContext, causing the SMF to reprogram the UPF's Forwarding Action Rule and deliver the victim UE's downlink user-plane traffic to the attacker's gNB.
This violates the per-NG-RAN-node scope of UE-associated NGAP signalling defined in 3GPP TS 38.413 §10.6 and §9.3.3.2. |
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| Nguồn | ⚠️ https://github.com/open5gs/open5gs/issues/4498 |
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| Người dùng | Seungjoon Na (UID 97657) |
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| Đệ trình | 28/04/2026 04:17 (cách đây 1 tháng) |
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| Kiểm duyệt | 16/05/2026 14:38 (18 days later) |
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| Trạng thái | được chấp nhận |
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| Mục VulDB | 364330 [Open5GS đến 2.7.6 AMF/MME src/amf/context.c ran_ue_find_by_amf_ue_ngap_id nâng cao đặc quyền] |
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| điểm | 20 |
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