Microsoft Exchange service exposes nearly 100,000 names and logins

The Autodiscover feature in Microsoft Substitution is resulting in a bit more data being exchanged than users likely hoped for. In brusk, Guardicore reports that the Autodiscover protocol's improper implementation has led to "96,671 unique credentials" being leaked (via BleepingComputer).

Here's an aggressively simplified overview of how the leaks happened: Imagine an Substitution user signs into a mail customer (Outlook, for example). Said client volition effort to ensure Exchange Autodiscover URLs are legitimate. That user's login details are and so sent to the URLs in question.

However, considering of the procedures of some mail clients, the Autodiscover protocol results in untrusted domains receiving hallmark attempts. And that means that the untrusted domain'due south owners can collect the information they wrongly received and do whatever they want with it.

That'due south how the leak occurs, and how 96,671 credentials have gone places they shouldn't take. You tin can read Guardicore's full study for the nitty-gritty details, but that's a full general summary of the situation.

When BleepingComputer reached out to Microsoft about the issue, this was Senior Director of Communications Jeff Jones' response:

We are actively investigating and will take appropriate steps to protect customers. We are committed to coordinated vulnerability disclosure, an industry standard, collaborative arroyo that reduces unnecessary chance for customers before issues are fabricated public. Unfortunately, this effect was not reported to us before the researcher marketing team presented it to the media, so nosotros learned of the claims today.

Microsoft has repeatedly reminded everyone to play it smart with Exchange, though in this particular instance, information technology'south not clear how exactly users tin can practice annihilation on their end for added protection. We'll update the story if the company updates its guidance regarding the current situation.

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