Multiple Vulnerabilities in Firefox Products Could Allow for Arbitrary Code Execution

ITS ADVISORY NUMBER:

2022-062

DATE(S) ISSUED:

Thursday, May 5, 2022

SUBJECT:

Multiple Vulnerabilities in Firefox Products Could Allow for Arbitrary Code Execution

OVERVIEW:

Multiple vulnerabilities have been discovered in Mozilla Firefox and Firefox Extended Support Release (ESR), 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.

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 99
Firefox ESR versions prior to 91.8

RISK:

Government:

Large and medium government entities: High

Small government entities: Medium

Business:

Large and medium business entities: High

Small business entities: Medium

Home Users: Low

DESCRIPTION:

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

Fullscreen notification bypass using popups (CVE-2022-29914)
Bypassing permission prompt in nested browsing contexts (CVE-2022-29909)
Leaking browser history with CSS variables (CVE-2022-29916)
Reader mode bypassed SameSite cookies (CVE-2022-29912)
Firefox for Android forgot HTTP Strict Transport Security settings (CVE-2022-29910)
Leaking cross-origin redirect through the Performance API (CVE-2022-29915)
iframe Sandbox bypass (CVE-2022-29911)
Memory safety bugs fixed in Firefox 100 and Firefox ESR 91.9 (CVE-2022-29917)
Memory safety bugs fixed in Firefox 100 (CVE-2022-29918)

ACTIONS:

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/mfsa2022-16/
https://www.mozilla.org/en-US/security/advisories/mfsa2022-17/

CISA:
https://www.cisa.gov/uscert/ncas/current-activity/2022/05/04/mozilla-rel...

Multiple Vulnerabilities in Firefox Products Could Allow for Arbitrary Code Execution

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