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Slack patches Windows app bug that could've been used for spying

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A safety researcher has exposed a flaw in Slack that would’ve been exploited to thieve recordsdata over the industry messaging app and doubtlessly unfold malware.

The flaw comes to Slack’s Home windows desktop app, and the way it can routinely ship downloaded recordsdata to a definite vacation spot—whether or not or not it’s for your PC or to an internet garage server. You’ll set a obtain location within the app’s personal tastes segment. Then again, David Wells, a researcher on the safety company Tenable, spotted there may be in a different way to configure the choice: By way of a unique hyperlink.

“Crafting a hyperlink like ‘slack://settings/?replace=’PrefSSBFileDownloadPath’:<pathHere>” would alternate the default obtain location if clicked,” Wells wrote in a weblog put up at the vulnerability.

Wells discovered the similar serve as may well be abused. Believe a hacker the usage of the hyperlinks to secretly reconfigure a Slack desktop app to ship all downloaded recordsdata to an outdoor server. “The usage of this assault vector, an insider may just exploit this vulnerability for company espionage, manipulation, or to realize get entry to to paperwork outdoor in their purview,” Neatly’s safety company Tenable stated in a separate document.

Symbol: david wells / medium / screenshot

The vulnerability too can pave the way in which for attainable malware infections. Any downloaded recordsdata despatched to the hacker-controller server may also be altered and booby-trapped to incorporate malicious code. The assault will start as soon as the sufferer opens the record at the Slack desktop app.

The principle impediment of sporting out this assault is circulating the hacker-created hyperlinks to other folks on Slack, which helps to keep its channels non-public to paying shoppers and their corporations. To drag this off, Wells spotted how Slack channels may also be configured to subscribe to RSS feeds, together with threads on Reddit.

“I may just make a put up to a very talked-about Reddit group that Slack customers all over the world are subscribed to,” Wells stated. The hacker-created hyperlink will then populate within the Slack channel and in all probability draw in some clicks.

“This method may well be unmasked via savvy Slack customers, alternatively if many years of phishing campaigns have taught us the rest, it is that customers click on hyperlinks, and when leveraged thru an untrusted RSS feed, the have an effect on can get a lot more fascinating,” he added.

Slack has patched the flaw in model of the Home windows desktop app. “We investigated and located no indication that this vulnerability used to be ever applied, nor stories that our customers had been impacted,” the corporate stated in an e-mail.

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