Security Experts:

Google Chrome Hit in Another Mysterious Zero-Day Attack

Google late Tuesday shipped another urgent security patch for its dominant Chrome browser and warned that attackers are exploiting one of the zero-days in active attacks.

This is the fourth in-the-wild Chrome zero-day discovered so far in 2021 and the continued absence of IOC data or any meaningful information about the attacks continue to raise eyebrows among security experts.

The newest Chrome update -- 90.0.4430.85 -- is available for Windows, Mac and Linux users and is being rolled out via the browser’s automatic update mechanism.

According to a Google Chrome advisory, the update patches at seven security vulnerabilities but the company only provided one-line documentation and CVE IDs for five bugs.

The vulnerability being exploited is identified as CVE-2021-21224 and simply described as a “type confusion” in the V8 Chrome rendering engine.  Google credited the Jose Martinez (tr0y4) from VerSprite Inc. for reporting the vulnerability.

“Google is aware of reports that exploits for CVE-2021-21224 exist in the wild,” the company said.

The Chrome update also fixes a heap buffer overflow in V8, an integer overflow bug in Mojo, an out-of-bounds memory access issue in V8 and a use-after-free vulnerability in Navigation.

Related: Google Chrome Zero-Day Under Attack, Again

Related: MS Patch Tuesday - NSA Reports New Critial Exchange Flaws

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Ryan Naraine is Editor-at-Large at SecurityWeek and host of the popular Security Conversations podcast series. He is a journalist and cybersecurity strategist with more than 20 years experience covering IT security and technology trends. Ryan has built 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 conference series. Ryan's career as a journalist includes bylines at major technology publications including Ziff Davis eWEEK, CBS Interactive's ZDNet, PCMag and PC World. Ryan is a director of the Security Tinkerers non-profit, and a regular speaker at security conferences around the world. Follow Ryan on Twitter @ryanaraine.