Google Chrome Could Allow for Arbitrary Code Execution

Fortify Security Team
Dec 14, 2021

Multiple vulnerabilities have been discovered in Google Chrome, the most severe of which could allow for arbitrary code execution. Google Chrome is a web browser used to access the Internet. Successful exploitation of the most severe of these vulnerabilities could allow an attacker to execute arbitrary code in the context of the browser. Depending on the privileges associated with the application, an attacker could view, change, or delete data. If this application has been configured to have fewer user rights on the system, exploitation of the most severe of these vulnerabilities could have less impact than if it was configured with administrative rights.

THREAT INTELLIGENCE: There are reports that an exploit for CVE-2021-4102 exists in the wild.

SYSTEMS AFFECTED:

  • Google Chrome versions prior to 96.0.4664.110

RISK:
Government:

  • Large and medium government entities: High
  • Small government entities: Medium

Businesses:

  • Large and medium business entities: High
  • Small business entities: Medium

Home users: Low

TECHNICAL SUMMARY:

Multiple vulnerabilities have been discovered in Google Chrome, the most severe of which could allow for arbitrary code execution. Details of the vulnerabilities are as follows:

  • Insufficient data validation in Mojo. (CVE-2021-4098)
  • Use after free in Swiftshader. (CVE-2021-4099)
  • Object lifecycle issue in ANGLE. (CVE-2021-4100)
  • Heap buffer overflow in Swiftshader. (CVE-2021-4101)
  • Use after free in V8. (CVE-2021-4102)

Successful exploitation of the most severe of these vulnerabilities could allow an attacker to execute arbitrary code in the context of the browser. Depending on the privileges associated with the application, an attacker could view, change, or delete data. If this application has been configured to have fewer user rights on the system, exploitation of the most severe of these vulnerabilities could have less impact than if it was configured with administrative rights.

RECOMMENDATIONS:

We recommend the following actions be taken:

  • Apply the stable channel update provided by Google to vulnerable systems immediately after appropriate testing.
  • Run all software as a non-privileged user (one without administrative privileges) to diminish the effects of a successful attack.
  • Remind users not to visit un-trusted websites or follow links provided by unknown or un-trusted sources.
  • Inform and educate users regarding the threats posed by hypertext links contained in emails or attachments especially from un-trusted sources.
  • Apply the Principle of Least Privilege to all systems and services.

REFERENCES:

Google:
https://chromereleases.googleblog.com/2021/12/stable-channel-update-for-desktop_13.html

CVE:
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-4098
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-4099
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-4100
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-4101
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-4102

Bleeping Computer:
https://www.bleepingcomputer.com/news/security/google-pushes-emergency-chrome-update-to-fix-zero-day-used-in-attacks/

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