| Titolo | Open5GS v2.7.6 Denial of Service |
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| Descrizione | 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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| Fonte | ⚠️ https://github.com/open5gs/open5gs/issues/4190 |
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| Utente | WeiYi (UID 96864) |
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| Sottomissione | 24/06/2026 08:37 (2 mesi fa) |
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| Moderazione | 09/08/2026 19:45 (2 months later) |
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| Stato | Accettato |
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| Voce VulDB | 387279 [Open5GS fino a 2.7.6 HSS Service fd_msg_sess_get Session-Id negazione del servizio] |
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| Punti | 20 |
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