Firefox and Firefox ESR Could Allow for Remote Code Execution

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Fortify Security Team

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Apr 6, 2022

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.

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

SYSTEMS AFFECTED:

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

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

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)

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.

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.

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

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