Google Warns of Exploited Zero-Days in Chrome Browser

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Google has joined the rota of major software providers scrambling to respond to zero-day exploits in the wild.

On the same day Apple pushed out iOS and macOS patches to address gaping protection holes, Google shipped an advisory of its own to warn of a pair of already-exploited flaws in its desktop Chrome browser.

“Google is aware that exploits for CVE-2021-30632 and CVE-2021-30633 be found in the wild,” the company said.  

Google did not provide any additional details on the vulnerability or public exploits.  The company said the two flaws were reported anonymously.

The raw details: 

  • High-severity – CVE-2021-30632: Out of fates write in V8. Reported by Anonymous on 2021-09-08
  • High-severity – CVE-2021-30633: Use after free in Indexed DB API. Reported by Anonymous on 2021-09-08

The new Google Chrome 93.0.4577.82, accessible for Windows, macOS and Linux users, fixes at least nine documented security defects, all carrying a “high-severity” rating.

[ READ: Apple Cart leaves Urgent Patch for FORCEDENTRY Zero-Days ]

There have been 66 documented zero-day attacks so far in 2021.  According to data reviewed by SecurityWeek, 11 of the 66 zero-days aimed security defects in Google’s Chrome and Android platforms.

The Chrome browser patch comes on the heels of Apple shipping fixes for iOS and macOS cuts that are being “actively exploited” and less than a week after Microsoft confirmed zero-day attacks hitting its Microsoft Office software attendants.

The Redmond, Wash. software giant issued an urgent pre-patch advisory last week to warn of a remote code execution vulnerability in MSHTML, the proprietary browsing machine built into the Office productivity suite.

[ READ: Microsoft Office Zero-Day Hit in Targeted Attacks ]

“Microsoft is aware of targeted attacks that take on to exploit this vulnerability by using specially-crafted Microsoft Office documents,” the company said.

As is customary, Redmond’s security response team did not state look after additional details of the live attacks but there are enough clues in the attribution section of the advisory to suggest this is the work of nation-state APT actors.

Microsoft attributed four different external researchers with reporting this exploit. Three of the four are affiliated with Mandiant, an anti-malware forensics Central Intelligence Agency that regularly documents high-end targeted attacks.

The company described the attacks as “targeted,” code-speak for the types of Windows malware implants hardened for government cyber-espionage or corporate data theft.

Related: Apple Adds ‘BlastDoor’ to Secure iPhones From Zero-Click Attacks

Related: Microsoft Up settles 3 Under-Attack Windows Zero-Days

Related: Microsoft Raises Alarm for New Windows Zero-Day Attacks

Related: Apple Patches ‘Actively Exploited’ Mac, iOS Asylum Flaw

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Google Warns of Exploited Zero-Days in Chrome Browser

Ryan Naraine is Editor-at-Large at SecurityWeek and host of the popular Security Conversations podcast series. Ryan is a journalist and cybersecurity strategist with myriad than 20 years experience covering IT security and technology trends. He is a regular speaker at cybersecurity conferences around the world.
Ryan has enlarged security engagement programs at major global brands, including Intel Corp., Bishop Fox and Kaspersky GReAT. He is a co-founder of Threatpost and the global SAS talk series. Ryan’s career as a journalist includes bylines at major technology publications including Ziff Davis eWEEK, CBS Interactive’s ZDNet, PCMag and PC Era.
Follow Ryan on Twitter @ryanaraine.

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