Exchange Server修補程式造成系統停止運作,微軟暫停發送
支付動態 · 2024-11-19

微軟11月Patch Tuesday釋出的Exchange Server安全更新,導致某些系統停止收發信件,微軟公告撤回該更新待日後重發

背景/Mick Haupt on Unsplash

微軟於上周釋出的Exchange Server修補程式引發部份系統停止收發信件,迅即遭微軟撤回待日後重發。

上周包含在11月Patch Tuesday釋出的Exchange Server安全更新版,是為了解決編號CVE-2024-49040的冒名漏洞,影響Exchange Server 2016及2019。不過在釋出隔天微軟就宣布暫停部署,原因是部份管理員反映,安裝更新後郵件完全暫停收發。

微軟解釋,該公司注意到用戶在安裝本更新後,發生傳輸(Transport)規則不時暫停的問題。初步調查顯示,這發生在使用自有Transport或DLP規則的用戶身上。

微軟已啟動調查,並在上周暫停經由Windows Update或Microsoft Update發布這個版本的Exchange Server更新,預定之後重新發送新版更新。在此之前,微軟建議出現上述情形的企業移除11月的軟體更新,但未使用Transport或DLP規則,也未發生郵件停擺情形者,微軟說不影響11月安全更新的使用

本更新修補的CVE-2024-49040為CVSS 3.1版風險評分7.5的冒名漏洞,能讓攻擊者在惡意郵件中冒用合法寄送者。它是起於郵件傳輸中,Exchange Server對P2 FROM header的驗證不當,使得不符合RFC 5322 header格式的信件也能通過,並以合法郵件的樣貌出現在Microsoft Outlook之中。

上周微軟警告,CVE-2024-49040已經發生濫用情形。因此,若企業未使用Transport或DLP規則,也未發生郵件停擺情形者,仍應保留11月安全更新。

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