漏洞信息
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Vulnerability Title
free5GC AUSF authentication contexts can be overwritten by concurrent requests for the same SUPI
Vulnerability Description
free5GC is an open-source implementation of the 5G core network. In version 1.4.4 and earlier, the AUSF component stores per-subscriber authentication state in a global sync.Map named AUSFContext.UePool in internal/context/context.go, keyed only by SUPI. Every request handled by internal/sbi/processor/ue_authentication.go creates an AusfUeContext, and AddAusfUeContextToPool executes ausfContext.UePool.Store(ausfUeContext.Supi, ausfUeContext), unconditionally replacing the active context for that SUPI. An attacker with access to the AUSF SBI/N12 interface can send concurrent POST /nausf-auth/v1/ue-authentications requests for the same target SUPI, causing all attempts to share one logical authentication context URL while K_aut, XRES, and EapID are repeatedly overwritten. A valid EAP-AKA' response for an earlier challenge is then checked against the latest context, causing AT_MAC verification to fail and denying authentication to the selected subscriber while the request flood continues. No fixed version is available as of this review.
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Vulnerability Type
使用共享资源的并发执行不恰当同步问题(竞争条件)
Vulnerability Title
free5GC 竞争条件问题漏洞
Vulnerability Description
free5GC是free5GC团队开源的一个第 5 代 (5G) 移动核心网络的项目平台。 free5GC 1.4.4及之前版本存在竞争条件问题漏洞,该漏洞源于AUSF组件将认证状态存储在全局sync.Map中,仅以SUPI为键,导致并发请求可覆盖活动认证上下文,造成所选用户认证被拒绝。
CVSS Information
N/A
Vulnerability Type
N/A