GitHub修補重大層級的SAML身分驗證繞過漏洞
支付動態 · 2024-10-17
近期GitHub更新Enterprise Server（GHES），當中修補重大層級的身分驗證繞過漏洞CVE-2024-9487，並指出這項漏洞是處理另一項漏洞的過程引發
10月10日GitHub發布Enterprise Server（GHES）更新3.14.2、3.13.5、3.12.10、3.11.16版，當中修補身分驗證繞過漏洞CVE-2024-9487、資訊洩漏漏洞CVE-2024-9539，以及1個尚未登記CVE編號的漏洞。
其中，最值得留意的是被評為重大層級的CVE-2024-9487，攻擊者可藉由選用的加密斷言（assertion）功能繞過SAML單一簽入（SSO）身分驗證，而能在未經授權的情況下為使用者開通服務，或是存取GHES執行個體。此漏洞的4.0版CVSS風險評分達到9.5（滿分10分）。
對於CVE-2024-9487發生的原因，GitHub表示是他們在今年5月緩解CVE-2024-4985（CVSS風險評為10分）的過程當中衍生。
不過，攻擊者若要利用這項漏洞，必須在特定條件才能觸發：他們要能夠存取已完成簽章簽署的SAML回應，或是相關的中繼資料文件，才有機會得逞。
GitHub強調，並非所有的GHES都曝險。他們指出，預設組態的GHES並未啟動加密斷言機制，而不受影響；再者，若是未採用SAML單一簽入這類身分驗證機制，或用上述單一簽入但未搭配加密斷言的情況下，也不會受到這項漏洞資安風險的影響。
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