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Multiple Vulnerabilities in Google Chrome Could Allow for Remote Code Execution

MS-ISAC ADVISORY NUMBER:

2021-112

DATE(S) ISSUED:

09/14/2021

OVERVIEW:

Multiple vulnerabilities have been discovered in Google Chrome, the most severe of which could allow for remote 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:

Google reported that exploits for CVE-2021-30632 and CVE-2021-30633 exist in the wild.

SYSTEMS AFFECTED:

  • Google Chrome versions prior to 93.0.4577.82

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 remote code execution. Details of the vulnerabilities are as follows:  
  • A Use after free in Selection API. (CVE-2021-30625)
  • An Out of bounds memory access in ANGLE. (CVE-2021-30626)
  • A Type Confusion in Blink layout. (CVE-2021-30627)
  • A Stack buffer overflow in ANGLE. (CVE-2021-30628)
  • A Use after free in Permissions. (CVE-2021-30629)
  • An Inappropriate implementation in Blink. (CVE-2021-30630)
  • A Type Confusion in Blink layout. (CVE-2021-30631)
  • An Out of bounds write in V8. (CVE-2021-30632)
  • A Use after free in Indexed DB API (CVE-2021-30633)
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/2021/09/stable-channel-update-for-desktop.html

CVE:
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30625

https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30626

https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30627

https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30628

https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30629

https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30630

https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30631

https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30632

https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30633

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Pencil Blog post 15 Nov 2021