Google addresses a high severity flaw in V8 engine in Chrome

Google released updates for Chrome 90 that address a new serious issue, tracked as CVE-2021-21227, in the V8 JavaScript engine used by the web browser.

Google has released security updates for Chrome 90 that address a new high severity vulnerability, tracked as CVE-2021-21227, that resides in the V8 JavaScript engine used by the web browser.

The CVE-2021-21227 vulnerability is an insufficient data validation issue that could be exploited by remote attackers to achieve code execution within the target’s browser.

The vulnerability was reported to Google by Gengming Liu from the Chinese cybersecurity firm Singular Security Lab who also received a $15,000 award for this vulnerability.

The vulnerability could not be exploited by attackers to escape the Chrome sandbox, but chaining it with a sandbox escape exploit could allow the execution of malicious code on the underlying OS.

The CVE-2021-21227 flaw is linked to the CVE-2020-16040 and CVE-2020-15965 vulnerabilities that were addressed by Google in 2020. Chrome in December and September 2020, respectively.

Google has patched several serious V8 vulnerabilities in recent weeks, including some for which PoC exploits were released before patches were made available. For some of these security holes, Google warned that exploits exist in the wild.

The Chrome 90 update addressed a toatal of 9 vulnerabilities, including the CVE-2021-21227. Below the issues that were reported by external researchers:

[$NA][1175058] High CVE-2021-21232: Use after free in Dev Tools. Reported by Abdulrahman Alqabandi, Microsoft Browser Vulnerability Research on 2021-02-05
[$TBD][1182937] High CVE-2021-21233: Heap buffer overflow in ANGLE. Reported by Omair on 2021-02-26
[$5000][1139156] Medium CVE-2021-21228: Insufficient policy enforcement in extensions. Reported by Rob Wu on 2020-10-16
[$TBD][1198165] Medium CVE-2021-21229: Incorrect security UI in downloads. Reported by Mohit Raj (shadow2639) on 2021-04-12
[$TBD][1198705] Medium CVE-2021-21230: Type Confusion in V8. Reported by Manfred Paul on 2021-04-13
[$NA][1198696] Low CVE-2021-21231: Insufficient data validation in V8. Reported by Sergei Glazunov of Google Project Zero on 2021-04-13

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Pierluigi Paganini

(SecurityAffairs – hacking, Chrome)

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Pierluigi Paganini

Pierluigi Paganini is member of the ENISA (European Union Agency for Network and Information Security) Threat Landscape Stakeholder Group and Cyber G7 Group, he is also a Security Evangelist, Security Analyst and Freelance Writer. Editor-in-Chief at "Cyber Defense Magazine", Pierluigi is a cyber security expert with over 20 years experience in the field, he is Certified Ethical Hacker at EC Council in London. The passion for writing and a strong belief that security is founded on sharing and awareness led Pierluigi to find the security blog "Security Affairs" recently named a Top National Security Resource for US. Pierluigi is a member of the "The Hacker News" team and he is a writer for some major publications in the field such as Cyber War Zone, ICTTF, Infosec Island, Infosec Institute, The Hacker News Magazine and for many other Security magazines. Author of the Books "The Deep Dark Web" and “Digital Virtual Currency and Bitcoin”.