Multiple Vulnerabilities in Google Chrome Could Allow for Arbitrary Code Execution

by CIRT Team

19 May 2021

in Security Advisories & Alerts

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DESCRIPTION:
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.

IMPACT:
Multiple vulnerabilities have been discovered in Google Chrome, the most
severe of which could allow for arbitrary code execution. These
vulnerabilities can be exploited if a user visits, or is redirected to,
a specially crafted web page. Details of the vulnerabilities are as follows:

* An incorrect security UI vulnerability exists in the ‘Webb App
Installs’ component. (CVE-2021-30506)
* An inappropriate implementation vulnerability exists in the ‘Offline’
component. (CVE-2021-30507)
* A heap buffer overflow vulnerability exists in the ‘Media Feeds’
component. (CVE-2021-30508)
* An out of bounds write vulnerability exists in the ‘Tab Strip’
component. (CVE-2021-30509)
* A race vulnerability exists in the ‘Aura’ component. (CVE-2021-30510)
* An out of bounds read vulnerability exists in the ‘Tab Groups’
component. (CVE-2021-30511)
* A use-after-free vulnerability exists in the ‘Notifications’
component. (CVE-2021-30512)
* A type confusion vulnerability exists in the ‘V8’ component.
(CVE-2021-30513)
* A use-after-free vulnerability exists in the ‘Autofill’ component.
(CVE-2021-30514)
* A use-after-free vulnerability exists in the ‘File API component’.
(CVE-2021-30515)
* A heap buffer overflow vulnerability exists in the ‘History’
component. (CVE-2021-30516)
* A type confusion vulnerability exists in the ‘V8’ component.
(CVE-2021-30517)
* A heap buffer overflow vulnerability exists in the ‘Reader Mode’
component. (CVE-2021-30518)
* A use-after-free vulnerability exists in the ‘Payments’ component.
(CVE-2021-30519)
* A use-after-free vulnerability exists in the ‘Tab Strip’ component.
(CVE-2021-30520)

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.

SYSTEM AFFECTED:
* Google Chrome versions prior to 90.0.4430.212

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.

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