Multiple vulnerabilities have been discovered in Mozilla Firefox Products, the most severe of which could allow for arbitrary code execution.
- Mozilla Firefox is a web browser used to access the Internet.
- Mozilla Firefox ESR is a version of the web browser intended to be deployed in large organizations.
- Mozilla Thunderbird is an email client
- Mozilla Firefox for Android is the Android based Firefox Browser on Android devices.
Successful exploitation of the most severe of these vulnerabilities could allow for arbitrary code execution. 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 INTELLIGENCE: There are currently no reports of these vulnerabilities being exploited in the wild.
SYSTEMS AFFECTED:
- Mozilla Firefox versions prior to 100.0.2
- Firefox ESR versions prior to 91.9.1
- Firefox for Android versions prior to 100.3.0
- Thunderbird versions prior to 91.9.1
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 Mozilla Firefox Products, the most severe of which could allow for arbitrary code execution. Details of these vulnerabilities are as follows:
Tactic: Execution (TA0002):
Technique: Command and Scripting Interpreter: JavaScript (T1059):
- Prototype pollution in Top-Level Await implementation. If an attacker was able to corrupt the methods of an Array object in JavaScript via prototype pollution, they could have achieved execution of attacker-controlled JavaScript code in a privileged context. (CVE-2022-1802)
- Untrusted input used in JavaScript object indexing, leading to prototype pollution. An attacker could have sent a message to the parent process where the contents were used to double-index into a JavaScript object. This leads to prototype pollution and the attacker-controlled JavaScript executes in the context of the privileged parent process. (CVE-2022-1529)
Successful exploitation of the most severe of these vulnerabilities could allow for arbitrary code execution. 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 the stable channel update provided by Mozilla 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.
- 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. (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.
- 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.
- Use capabilities to prevent suspicious behavior patterns from occurring on endpoint systems. This could include suspicious process, file, API call, etc. behavior. (M1040 : Behavior Prevention on Endpoint)
- Safeguard 13.2 : Deploy a Host-Based Intrusion Detection Solution: Deploy a host-based intrusion detection solution on enterprise assets, where appropriate and/or supported.
- Safeguard 13.7 : Deploy a Host-Based Intrusion Prevention Solution: Deploy a host-based intrusion prevention solution on enterprise assets, where appropriate and/or supported. Example implementations include use of an Endpoint Detection and Response (EDR) client or host-based IPS agent.
REFERENCES:
Mozilla: https://www.mozilla.org/en-US/security/advisories/mfsa2022-19/
CVE: https://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-1802
https://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-1529