| Título | Open5GS v2.7.6 Denial of Service |
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| Descripción | 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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| Fuente | ⚠️ https://github.com/open5gs/open5gs/issues/4190 |
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| Usuario | WeiYi (UID 96864) |
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| Sumisión | 2026-06-24 08:37 (hace 2 meses) |
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| Moderación | 2026-08-09 19:45 (2 months later) |
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| Estado | Aceptado |
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| Entrada de VulDB | 387279 [Open5GS hasta 2.7.6 HSS Service fd_msg_sess_get Session-Id denegación de servicio] |
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| Puntos | 20 |
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