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TLP: CLEAR
MS-ISAC CYBERSECURITY ADVISORY
MS-ISAC ADVISORY NUMBER:
2023-071
DATE(S) ISSUED:
07/04/2023
SUBJECT:
Multiple Vulnerabilities in Mozilla Products Could Allow for Arbitrary Code Execution
OVERVIEW:
Multiple vulnerabilities have been discovered in Mozilla 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.
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:
- Firefox ESR versions prior to 102.13
- Firefox versions prior to 115
- Thunderbird versions prior to 102.13
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 products, 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)
- CVE-2023-37201: Use-after-free in WebRTC certificate generation
- CVE-2023-37202: Potential use-after-free from compartment mismatch in SpiderMonkey
- CVE-2023-37211: Memory safety bugs fixed in Firefox 115, Firefox ESR 102.13, and Thunderbird 102.13
- CVE-2023-37212: Memory safety bugs fixed in Firefox 115
Additional lower priority vulnerabilities include:
- CVE-2023-3482: Block all cookies bypass for localstorage
- CVE-2023-37203: Drag and Drop API may provide access to local system files
- CVE-2023-37204: Fullscreen notification obscured via option element
- CVE-2023-37205: URL spoofing in address bar using RTL characters
- CVE-2023-37206: Insufficient validation of symlinks in the FileSystem API
- CVE-2023-37207: Fullscreen notification obscured
- CVE-2023-37208: Lack of warning when opening Diagcab files
- CVE-2023-37209: Use-after-free in NotifyOnHistoryReload
- CVE-2023-37210: Full-screen mode exit prevention
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 appropriate updates 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.
- 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.
- 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.
- Block execution of code on a system through application control, and/or script blocking. (M1038: Execution Prevention)
- Safeguard 2.5 : Allowlist Authorized Software: Use technical controls, such as application allowlisting, to ensure that only authorized software can execute or be accessed. Reassess bi-annually, or more frequently.
- Safeguard 2.6 : Allowlist Authorized Libraries: Use technical controls to ensure that only authorized software libraries, such as specific .dll, .ocx, .so, etc., files, are allowed to load into a system process. Block unauthorized libraries from loading into a system process. Reassess bi-annually, or more frequently.
- Safeguard 2.7 : Allowlist Authorized Scripts: Use technical controls, such as digital signatures and version control, to ensure that only authorized scripts, such as specific .ps1, .py, etc., files, are allowed to execute. Block unauthorized scripts from executing. Reassess bi-annually, or more frequently.
- 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.
Mozilla:
https://www.mozilla.org/en-US/security/advisories/mfsa2023-22/
https://www.mozilla.org/en-US/security/advisories/mfsa2023-23/
https://www.mozilla.org/en-US/security/advisories/mfsa2023-24/
CVE:
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-3482
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-37201
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-37202
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-37203
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-37204
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-37205
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-37206
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-37207
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-37208
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-37209
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-37210
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-37211
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-37212
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.
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