FreeBSD修補虛擬機元件重大層級漏洞
支付動態 · 2024-09-24

上週FreeBSD發布安全性更新,主要是修補重大層級漏洞CVE-2024-41721,由於該漏洞沒有其他緩解機制,他們呼籲用戶應儘速套用相關更新

9月19日FreeBSD開發團隊發布資安公告,他們發布14.1-STABLE、14.1-RELEASE-p5、14.0-RELEASE-p11、13.4-STABLE、13.4-RELEASE-p1,以及13.3-RELEASE-p7更新,目的是修補重大層級的漏洞CVE-2024-41721,這項漏洞存在於名為bhyve(8)的Hypervisor元件,屬於記憶體越界讀取(OBR)弱點,CVSS風險評為9.8分。

此漏洞發生的原因,在於bhyve透過虛擬USB控制器(XHCI)模擬裝置的過程中,缺乏充分的程式碼驗證,可能導致記憶體越界讀取,從而允許任意寫入檔案或是遠端執行程式碼的情況。

攻擊者若要利用這項弱點,可利用惡意軟體取得指定權限,並透過虛擬機器(VM)觸發漏洞,引發bhyve當機,可能於主機bhyve使用者空間層級的處理程序中,得以執行程式碼,由於該Hypervisor程式通常都會以root執行,換言之,攻擊者等於可藉此任意執行程式碼。

這項漏洞無緩解措施,因此FreeBSD維護團隊呼籲儘速更新。但他們也提及,若是未使用XHCI模擬機制的用戶,不會受到這項漏洞影響。

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