| 제목 | Open5GS v2.7.6 Denial of Service |
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| 설명 | Open5GS v2.7.6 is affected by a denial-of-service condition in the Diameter/S6a handling path of open5gs-hssd when processing a malformed Diameter Update-Location-Request (ULR) message. After a Diameter peer establishes an SCTP connection and completes a standard Capabilities-Exchange-Request (CER) registration step, a malformed ULR message with an invalid or missing Session-Id AVP can trigger an assertion failure inside the freeDiameter session management logic. The crash occurs in fd_msg_sess_get(), where the assertion `avp->avp_public.avp_value' fails. As a result, the open5gs-hssd process terminates with SIGABRT instead of rejecting the malformed Diameter message gracefully. An attacker with network access to the Diameter listener can send a crafted ULR message and crash the HSS service, causing a denial of service. |
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| 원천 | ⚠️ https://github.com/open5gs/open5gs/issues/4190 |
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| 사용자 | WeiYi (UID 96864) |
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| 제출 | 2026. 06. 24. AM 08:37 (2 개월 ago) |
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| 모더레이션 | 2026. 08. 09. PM 07:45 (2 months later) |
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| 상태 | 수락 |
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| VulDB 항목 | 387279 [Open5GS 까지 2.7.6 HSS Service fd_msg_sess_get Session-Id 서비스 거부] |
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| 포인트들 | 20 |
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