Mozilla Announces Critical Vulnerability In Firefox Products

Mozilla Announces Critical Vulnerability In Firefox Products

A cybersecurity advisory was issued Tuesday, June 18, 2019, regarding a vulnerability in Mozilla Firefox and Firefox Extended Support Release (ESR). This vulnerability could allow for arbitrary code execution, which could potentially lead to the loss or theft of data. Updates are available now.

What It Is:
A vulnerability has been discovered in Mozilla Firefox and Firefox Extended Support Release (ESR), 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 this vulnerability could allow for arbitrary code execution through an exploitable crash. 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.

Read the original Mozilla Foundation Security Advisory.

Threat Intelligence:
Mozilla is currently aware of targeted attacks in the wild abusing this flaw.

Systems Affected:

• Mozilla Firefox versions prior to 67.0.3
• Mozilla Firefox ESR versions prior to 60.7.1

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

What It Means:
If you and/or your business utilize Mozilla Firefox products you will need to install the appropriate update(s) following proper testing.

Technical Summary:
A vulnerability has been discovered in Mozilla Firefox and Firefox Extended Support Release (ESR), which could allow for arbitrary code execution. A type confusion vulnerability can occur when manipulating JavaScript objects due to issues in Array.pop. This can allow for an exploitable crash (CVE-2019-11707).

What To Do:
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 untrusted websites or follow links provided by unknown or untrusted sources.
• Inform and educate users regarding the threats posed by hypertext links contained in emails or attachments especially from untrusted sources.
• Apply the Principle of Least Privilege to all systems and services.

Negative Consequences of Lost or Stolen Data:
The loss or theft of proprietary data can have severe impacts, particularly if the compromise becomes public and sensitive information is exposed. Possible impacts include:

• Temporary or permanent loss of sensitive or proprietary information.
• Disruption to regular operations.
• Financial losses incurred to restore systems and files.
• Potential harm to an organization’s reputation.

Should your agency or business need assistance with issues arising from vulnerabilities in Mozilla Firefox products including updates and/or patches, Dox can help. Please contact Dox if there is anything we can do to assist in securing your agency, business, or organization.

Thank you for your time and stay safe online.