[BreachExchange] Google Warns of Exploited Zero-Days in Chrome Browser

[Sophia Kingsbury]

https://www.securityweek.com/google-warns-exploited-zero-days-chrome-browser

On the same day Apple pushed out iOS and macOS patches to address gaping
security 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 exist
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 bounds 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, available for Windows, macOS and Linux
users, fixes at least nine documented security defects, all carrying a
“high-severity” rating.

There have been 66 documented zero-day attacks so far in 2021.  According
to data reviewed by SecurityWeek, 11 of the 66 zero-days targeted 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 flaws that are being “actively exploited” and less than a week
after Microsoft confirmed zero-day attacks hitting its Microsoft Office
software suite.

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 engine built into the Office productivity suite.

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

As is customary, Redmond’s security response team did not provide
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 credited four different external researchers with reporting this
exploit. Three of the four are affiliated with Mandiant, an anti-malware
forensics firm that regularly documents high-end targeted attacks.

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