Mozilla Firefox Could Allow for Arbitrary Code Execution

Fortify Security Team
Jan 11, 2022

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

  • Mozilla Firefox versions prior to 96
  • Firefox ESR versions prior to 91.5
  • Thunderbird versions prior to 91.5

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

  • Iframe sandbox bypass with XSLT (CVE-2021-4140)
  • Potential local privilege escalation when loading modules from the install directory. (CVE-2022-22736)
  • Race condition when playing audio files (CVE-2022-22737)
  • Heap-buffer-overflow in blendGaussianBlur (CVE-2022-22738)
  • Missing throttling on external protocol launch dialog (CVE-2022-22739)
  • Use-after-free of ChannelEventQueue::mOwner (CVE-2022-22740)
  • Browser window spoof using fullscreen mode (CVE-2022-22741)
  • Out-of-bounds memory access when inserting text in edit mode (CVE-2022-22742)
  • Browser window spoof using fullscreen mode (CVE-2022-22743)
  • The ‘Copy as curl’ feature in DevTools did not fully escape website-controlled data, potentially leading to command injection (CVE-2022-22744)
  • Leaking cross-origin URLs through securitypolicyviolation event (CVE-2022-22745)
  • Calling into reportValidity could lead to fullscreen window spoof (CVE-2022-22746)
  • Crash when handling empty pkcs7 sequence (CVE-2022-22747)
  • Spoofed origin on external protocol launch dialog (CVE-2022-22748)
  • Lack of URL restrictions when scanning QR codes (CVE-2022-22749)
  • IPC passing of resource handles could lead to sandbox bypass (CVE-2022-22750)
  • Memory safety bugs fixed in Firefox 95, Firefox ESR 91.4, and Thunderbird 91.4 (CVE-2022-22751)
  • Memory safety bugs fixed in Firefox 95 (CVE-2022-22752)

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.
  • 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/mfsa2022-01/

https://www.mozilla.org/en-US/security/advisories/mfsa2022-02/

https://www.mozilla.org/en-US/security/advisories/mfsa2022-03/

CVE:

https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-4140

https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-22736

https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-22737

https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-22738

https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-22739

https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-22740

https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-22741

https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-22742

https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-22743

https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-22744

https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-22745

https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-22746

https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-22747

https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-22748

https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-22749

https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-22750

https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-22751

https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-22752

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