Vulnerability in Mozilla Firefox Identified

Vulnerability in Mozilla Firefox Identified

A cybersecurity advisory was issued yesterday, Wednesday, Jan. 8, 2020 regarding a vulnerability in Mozilla Firefox and Firefox Extended Support Release (ESR). The vulnerability could allow an attacker to execute arbitrary code, which could potentially lead to a breach.

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. 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:
According to Mozilla, there are reports of this vulnerability being actively exploited in the wild.

Systems Affected:

• Firefox versions prior to 72.0.1
• Firefox ESR versions prior to 68.4.1

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 the Mozilla Firefox versions mentioned above, you will need to apply appropriate updates provided by Mozilla to vulnerable systems 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. Details of this vulnerability is as follows:

• Incorrect alias information in IonMonkey JIT compiler for setting array elements could lead to a type confusion. We are aware of targeted attacks in the wild abusing this flaw (CVE-2019-17026)

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 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.