Critical Zoom vulnerabilities fixed last week required no user interaction

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Google’s Challenge Zero vulnerability analysis staff detailed essential vulnerabilities Zoom patched last week making that made it doable for hackers to execute zero-click assaults that remotely ran malicious code on units operating the messaging software program.

Tracked as CVE-2022-22786 and CVE-2022-22784, the vulnerabilities made it doable to carry out assaults even when the sufferer took no motion apart from to have the consumer open. As detailed on Tuesday by Google Challenge Zero researcher Ivan Fratric, inconsistencies in how the Zoom consumer and Zoom servers parse XMPP messages made it doable to “smuggle” content material in them that often can be blocked. By combining these flaws with a glitch in the way in which Zoom’s code-signing verification works, Fratric achieved full code execution.

“Person interplay will not be required for a profitable assault,” the researcher wrote. “The one potential an attacker wants is to have the ability to ship messages to the sufferer over Zoom chat over XMPP protocol.” Fratric continued:

Preliminary vulnerability (labeled XMPP Stanza Smuggling) abuses parsing inconsistencies between XML parsers on Zoom’s consumer and server so as to have the ability to “smuggle” arbitrary XMPP stanzas to the sufferer consumer. From there, by sending a specifically crafted management stanza, the attacker can power the sufferer consumer to connect with a malicious server, thus turning this primitive right into a man-in-the-middle assault. Lastly, by intercepting/modifying consumer replace requests/responses, the sufferer consumer downloads and executes a malicious replace, leading to arbitrary code execution. A consumer downgrade assault is utilized to bypass signature examine on the replace installer. This assault has been demonstrated in opposition to the most recent (5.9.3) consumer operating on Home windows 64-bit, nonetheless some or all elements of the chain are seemingly relevant to different platforms.

In December, Zoom lastly joined the twenty first century when it gave the macOS and Home windows purchasers the flexibility to replace mechanically. The severity of the vulnerabilities fastened final week underscores the significance of auto replace. Usually, inside a couple of hours or days of the updates like these turning into out there, hackers have already reverse engineered them and use them as an exploit highway map. And but, one of many computer systems I commonly use for Zoom had but to put in the patches till Wednesday, after I thought to decide on the “Test for Updates” choice.

For my Zoom consumer to auto replace, it wanted to run an intermediate model first. As soon as I manually up to date, the auto replace was lastly in place. Readers might wish to examine their techniques to make sure they’re operating the most recent model, too.



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