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Microsoft Teams security flaw lets hackers steal accounts – and there’s no fix in sight
There’s a safety flaw in Microsoft Groups that permits risk actors to log into different individuals’s accounts, even when these accounts are protected with multi-factor authentication, researchers have claimed.
Cybersecurity analysts from Vectra say the Groups desktop software for Home windows, Linux, and Mac, shops consumer authentication tokens in cleartext, with none locks guarding the entry. Anybody with native entry to a system with Groups put in can steal these tokens and use them to log into the accounts.
“This assault doesn’t require particular permissions or superior malware to get away with main inside injury,” Vectra’s Connor Peoples stated – Microsoft, then again, says the entire deal is blown out of proportion and it’s not all in favour of addressing the problem right now.
The issue lies in the truth that Microsoft Groups is an Electron app, working in a browser home windows. As Electron doesn’t include help for encryption, or protected file places by default, it’s considerably simpler to make use of, but additionally dangerous on the information safety aspect of issues. Deeper evaluation uncovered that the tokens weren’t saved in error, or as a part of a earlier knowledge dump.
“Upon evaluate, it was decided that these entry tokens had been energetic and never an unintended dump of a earlier error. These entry tokens gave us entry to the Outlook and Skype APIs,” Vectra defined. What’s extra, the “cookies” folder additionally held tokens, account data, session knowledge, and different worthwhile data.
However Microsoft performed the entire thing down, saying it isn’t that extreme and that it doesn’t meet the factors for patching.
In a press release despatched to BleepingComputer, Microsoft stated “The approach described doesn’t meet our bar for speedy servicing because it requires an attacker to first achieve entry to a goal community. We admire Vectra Defend’s partnership in figuring out and responsibly disclosing this subject and can contemplate addressing in a future product launch.”
Vectra, then again, disagrees, and to show its level, it developed an exploit that abuses an API name, permitting a consumer to ship messages to themselves. By studying the cookies database by SQLite engine, the exploit was in a position to obtain the authentication tokens in a message.
In the event you’re fearful about your small business (opens in new tab) having its tokens snatched, you must swap to the browser model of the Groups shopper, Vectra suggests. Linux customers ought to migrate to a special collaboration (opens in new tab) platform, as effectively.
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By way of: BleepingComputer (opens in new tab)