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The Recent Microsoft Exchange Attack Underscores the Vulnerability of Organizational Data


It is a little over a week since Microsoft Exchange email servers were attacked by a group which Microsoft as described as a network of hackers it calls Hafnium. It is not clear who these people are, but the attack, which impacted as many as 60,000 companies â€” and by some estimates 100,000 â€” has forced Microsoft to release out of-band emergency patches for Exchange Server 2013, Exchange Server 2016, and Exchange Server 2019.
Exchange Attack Spreading?
The situation is so bad, in fact, that Microsoft has also released updates for older, unsupported versions of Exchange to deal with the four newly discovered security vulnerabilities (Microsoft also made it clear that it was only patching these vulnerabilities and that these older versions will remain unsupported after this has passed.) ....

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Microsoft was warned about Exchange Server flaws two months ago


Warnings also came from Danish cyber security provider Dubex, which first witnessed clients being hit on 18 January. The company reported their incident response findings to Microsoft on 27 January.
In a blog post, Dubex detailed how hackers took advantage of the  unifying messaging module in Exchange, which allows organisations to store voicemail and fax files, as well as emails, calendars, and contacts in users’ mailboxes, in order to install web shell backdoors.
“A unified messaging server also allows users access to voicemail features via smartphones, Microsoft Outlook and Outlook Web App. Most users and IT departments manage their voicemail separately from their email, and voicemail and email exist as separate inboxes hosted on separate servers. Unified Messaging offers an integrated store for all messages and access to content through the computer and the telephone,” Dubex revealed. ....

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