Security News
Microsoft today published a detailed guide aiming to help customers discover signs of compromise via exploitation of a recently patched Outlook zero-day vulnerability. Microsoft also shared guidance on how to block future attacks targeting this vulnerability, urging organizations to install the recently released Outlook security update.
Security researchers have shared technical details for exploiting a critical Microsoft Outlook vulnerability for Windows that allows hackers to remotely steal hashed passwords by simply receiving an email. The issue is a privilege escalation vulnerability with a 9.8 severity rating that affects all versions of Microsoft Outlook on Windows.
"The attacker could exploit this vulnerability by sending a specially crafted email which triggers automatically when it is retrieved and processed by the Outlook client," Microsoft explained. While Microsoft doesn't provide any details about what kind of nefarious deeds attackers are doing after exploiting the bug - or how widespread attacks are - Zero Day Initiative's Dustin Childs advises: "Definitely test and deploy this fix quickly."
Microsoft has patched an Outlook zero-day vulnerability exploited by a hacking group linked to Russia's military intelligence service GRU to target European organizations. Microsoft shared this info in a private threat analytics report seen by BleepingComputer and available to customers with Microsoft 365 Defender, Microsoft Defender for Business, or Microsoft Defender for Endpoint Plan 2 subscriptions.
Microsoft will soon fast-track multi-factor authentication adoption for its Microsoft 365 cloud productivity platform by adding MFA capabilities to the Outlook email client. The company says in a new Microsoft 365 roadmap entry that users will be able to complete MFA requests for Microsoft 365 apps directly in the Outlook app via a new feature dubbed Authenticator Lite.
Microsoft has shared a fix for Outlook sign-in errors that iOS and Android users may encounter with mailboxes in some Exchange environments. "The error occurs in a hybrid Exchange environment, for mailboxes in on-premises Microsoft Exchange Server or Exchange Online," the company said in a support document released on Tuesday.
Microsoft says its Outlook for Mac email and calendar client is now available for free, and it will no longer require an Office license or a Microsoft 365 subscription to be used. Outlook for Mac comes with support for Microsoft 365, Outlook.com, Gmail, Yahoo Mail, iCloud, IMAP, and POP accounts, according to its Mac App Store page.
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According to reports from an increasing number of Microsoft customers, Outlook inboxes have been flooded with spam emails over the last nine hours because email spam filters are currently broken. This ongoing issue was confirmed by countless Outlook users who have reported that all messages were landing in their inboxes, even those that would have been previously tagged as spam and sent to the junk folder.
Microsoft is investigating and working on addressing an ongoing outage affecting the company's Outlook webmail service. According to information shared via the company's Microsoft 365 Status Twitter account, Redmond is performing targeted restarts to portions of the infrastructure impacted by a recent change.