Multiple vulnerabilities have been discovered in Mozilla Firefox and Firefox Extended Support Release (ESR),the most severe of which could allow for remote 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.

Successful exploitation of the most severe of these vulnerabilities could allow for remote 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.
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SYSTEMS AFFECTED:

• Mozilla Firefox versions prior to 99
• Firefox ESR versions prior to 91.8

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RISK:
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Government:

• Large and medium government entities: High
• Small government entities: Medium

Businesses:

• Large and medium business entities: High
• Small business entities: Medium
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Home users: Low

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TECHNICAL SUMMARY:

Multiple vulnerabilities have been discovered in Mozilla Firefox and Firefox Extended Support Release (ESR),the most severe of which could allow for remote code execution. Details of these vulnerabilities are as follows:

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• Use-after-free in NSSToken objects(CVE-2022-1097)
• Out of bounds write due to unexpected WebAuthN Extensions (CVE-2022-28281)
• Use-after-free after VR Process destruction (CVE-2022-1196)
• Use-after-free in DocumentL10n::TranslateDocument (CVE-2022-28282)
• Missing security checks for fetching sourceMapURL (CVE-2022-28283)
• Script could be executed via svg's use element (CVE-2022-28284)
• Incorrect AliasSet used in JIT Codegen (CVE-2022-28285)
• iframe contents could be rendered outside the border (CVE-2022-28286)
• Text Selection could crash Firefox (CVE-2022-28287)
• Denial of Service via complex regular expressions (CVE-2022-24713)
• Memory safety bugs which could be exploited for arbitrary code execution fixed in Firefox 99 and Firefox ESR 91.8 (CVE-2022-28289)
• Memory safety bugs which could be exploited for arbitrary code execution fixed in Firefox 99 (CVE-2022-28288)

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Successful exploitation of the most severe of these vulnerabilities could allow for remote 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.

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RECOMMENDATIONS:
We recommend the following actions be taken:

• Apply appropriate updates provided by Mozilla 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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REFERENCES:

Mozilla:
https://www.mozilla.org/en-US/security/advisories/mfsa2022-13/
https://www.mozilla.org/en-US/security/advisories/mfsa2022-14/

CVE:
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-1097 
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-1196
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-24713 
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-28281 
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-28282 
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-28283 
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-28284 
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-28285 
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-28286 
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-28287 
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-28288 
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-28289 

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