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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.

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

Written By

Ryan Naraine is Editor-at-Large at SecurityWeek and host of the popular Security Conversations podcast series. He is a security community engagement expert who has built programs at major global brands, including Intel Corp., Bishop Fox and GReAT. Ryan is a founding-director of the Security Tinkerers non-profit, an advisor to early-stage entrepreneurs, and a regular speaker at security conferences around the world.

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