Multiple Vulnerabilities in Google Chrome Could Allow for Arbitrary Code Execution

MS-ISAC ADVISORY NUMBER:

2021-073

DATE(S) ISSUED:

01/12/2022

OVERVIEW:

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 currently no reports of these vulnerabilities being exploited in the wild.

SYSTEMS AFFECTED:

Google Chrome versions prior to 91.0.4472.77

RISK:

Government:

Large and medium government entitiesHIGH

Small governmentHIGH

Businesses:

Large and medium business entitiesHIGH

Small business entitiesHIGH

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:

A heap buffer overflow vulnerability exists in the ‘Autofill’ component. (CVE-2021-30521)
A use after free vulnerability exists in WebAudio. (CVE-2021-30522)
A use after free vulnerability exists in WebRTC. (CVE-2021-30523)
A use after free vulnerability exists in TabStrip. (CVE-2021-30524)
A use after free vulnerability exists in TabGroups. (CVE-2021-30525)
An out of bounds write vulnerability exists in TabStrip. (CVE-2021-30526)
A use after free vulnerability exists in WebUI. (CVE-2021-30527)
A use after free vulnerability exists in WebAuthentication. (CVE-2021-30528)
A use after free vulnerability exists in Bookmarks. (CVE-2021-30529)
An out of bounds memory access vulnerability exists in WebAudio. (CVE-2021-30530)
An insufficient policy enforcement vulnerability exists in Content Security Policy. (CVE-2021-30531, CVE-2021-30532, CVE-2021-30538, CVE-2021-30539)
An insufficient policy enforcement vulnerability exists in PopupBlocker. (CVE-2021-30533)
An insufficient policy enforcement vulnerability exists in iFrameSandbox. (CVE-2021-30534)
A double free vulnerability exists in ICU. (CVE-2021-30535)
An insufficient data validation vulnerability exists in Networking. (CVE-2021-21212)
An out of bounds read vulnerability exists in V8. (CVE-2021-30536)
An insufficient policy enforcement vulnerability exists in Cookies. (CVE-2021-30537)
An incorrect security UI vulnerability exists in Payments. (CVE-2021-30540)

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.