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TLP: CLEAR
MS-ISAC CYBERSECURITY ADVISORY

MS-ISAC ADVISORY NUMBER:
2023-098

DATE(S) ISSUED:
09/05/2023

SUBJECT:
Multiple Vulnerabilities in Google Chrome Could Allow for Arbitrary Code
Execution

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. Depending on the privileges associated with
the user an attacker could then install programs; view, change, or delete data;
or create new accounts with full user rights. Users whose accounts are
configured to have fewer user rights on the system could be less impacted than
those who operate with administrative user rights.

THREAT INTELLEGENCE:
There are currently no reports of these vulnerabilities being exploited in the
wild

SYSTEMS AFFECTED:

 * Chrome versions prior to 116.0.5845.180 for Windows
 * Chrome versions prior to 116.0.5845.179 for Mac and Linux 

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 these
vulnerabilities are as follows: 

Tactic: Initial Access (TA0001):

Technique: Drive-By Compromise (T1189):

 * Out of bounds memory access in FedCM (CVE-2023-4761)
 * Type Confusion in V8 (CVE-2023-4762)
 * Use after free in Networks (CVE-2023-4763)
 * Incorrect security UI in BFCache (CVE-2023-4764)

Successful exploitation of the most severe of these vulnerabilities could allow
for arbitrary code execution in the context of the logged on user. Depending on
the privileges associated with the user an attacker could then install programs;
view, change, or delete data; or create new accounts with full user rights.
Users whose accounts are configured to have fewer user rights on the system
could be less impacted than those who operate with administrative user rights.

RECOMMENDATIONS:
We recommend the following actions be taken:

 * Apply appropriate updates provided by Google to vulnerable systems
   immediately after appropriate testing. (M1051: Update Software)
   * Safeguard 7.1: Establish and Maintain a Vulnerability Management Process:
     Establish and maintain a documented vulnerability management process for
     enterprise assets. Review and update documentation annually, or when
     significant enterprise changes occur that could impact this Safeguard.
   * Safeguard 7.4: Perform Automated Application Patch Management: Perform
     application updates on enterprise assets through automated patch management
     on a monthly, or more frequent, basis.
   * Safeguard 7.7: Remediate Detected Vulnerabilities: Remediate detected
     vulnerabilities in software through processes and tooling on a monthly, or
     more frequent, basis, based on the remediation process.
   * Safeguard 9.1: Ensure Use of Only Fully Supported Browsers and Email
     Clients: Ensure only fully supported browsers and email clients are allowed
     to execute in the enterprise, only using the latest version of browsers and
     email clients provided through the vendor.
      
 * Apply the Principle of Least Privilege to all systems and services. Run all
   software as a non-privileged user (one without administrative privileges) to
   diminish the effects of a successful attack. (M1026: Privileged Account
   Management)
   * Safeguard 4.7: Manage Default Accounts on Enterprise Assets and
     Software: Manage default accounts on enterprise assets and software, such
     as root, administrator, and other pre-configured vendor accounts. Example
     implementations can include: disabling default accounts or making them
     unusable.
   * Safeguard 5.4: Restrict Administrator Privileges to Dedicated Administrator
     Accounts: Restrict administrator privileges to dedicated administrator
     accounts on enterprise assets. Conduct general computing activities, such
     as internet browsing, email, and productivity suite use, from the user’s
     primary, non-privileged account.
 * Restrict execution of code to a virtual environment on or in transit to an
   endpoint system. (M1048: Application Isolation and Sandboxing)
 * Use capabilities to detect and block conditions that may lead to or be
   indicative of a software exploit occurring. (M1050: Exploit Protection)
   * Safeguard 10.5:  Enable Anti-Exploitation Features: Enable
     anti-exploitation features on enterprise assets and software, where
     possible, such as Microsoft® Data Execution Prevention (DEP), Windows®
     Defender Exploit Guard (WDEG), or Apple® System Integrity Protection (SIP)
     and Gatekeeper™.

 * Restrict use of certain websites, block downloads/attachments, block
   Javascript, restrict browser extensions, etc. (M1021: Restrict Web-Based
   Content)
   * Safeguard 9.2: Use DNS Filtering Services: Use DNS filtering services on
     all enterprise assets to block access to known malicious domains.
   * Safeguard 9.3: Maintain and Enforce Network-Based URL Filters: Enforce and
     update network-based URL filters to limit an enterprise asset from
     connecting to potentially malicious or unapproved websites. Example
     implementations include category-based filtering, reputation-based
     filtering, or through the use of block lists. Enforce filters for all
     enterprise assets.
   * Safeguard 9.6: Block Unnecessary File Types: Block unnecessary file types
     attempting to enter the enterprise’s email gateway.
      
 * Inform and educate users regarding the threats posed by hypertext links
   contained in emails or attachments especially from un-trusted sources. Remind
   users not to visit un-trusted websites or follow links provided by unknown or
   un-trusted sources. (M1017: User Training)
   * Safeguard 14.1: Establish and Maintain a Security Awareness
     Program: Establish and maintain a security awareness program. The purpose
     of a security awareness program is to educate the enterprise’s workforce on
     how to interact with enterprise assets and data in a secure manner. Conduct
     training at hire and, at a minimum, annually. Review and update content
     annually, or when significant enterprise changes occur that could impact
     this Safeguard.
   * Safeguard 14.2: Train Workforce Members to Recognize Social Engineering
     Attacks: Train workforce members to recognize social engineering attacks,
     such as phishing, pre-texting, and tailgating.

REFERENCES:

> Google:
> https://chromereleases.googleblog.com/2023/09/stable-channel-update-for-desktop.html
> 
> CVE:
> http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-4761
> http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-4762
> http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-4763
> http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-4764

Multi-State Information Sharing and Analysis Center (MS-ISAC)
Elections Infrastructure Information Sharing and Analysis Center (EI-ISAC)
31 Tech Valley Drive
East Greenbush, NY 12061

24×7 Security Operations Center
SOC@cisecurity.org - 1-866-787-4722

TLP:CLEAR
www.cisa.gov/tlp
Information may be distributed without restriction, subject to standard
copyright rules.

Center for Internet Security

Northeast Headquarters | 31 Tech Valley Drive | East Greenbush, NY 12061 |
Phone: 518-266-3460


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