VULNERABILITY AFFECTS MULTIPLE MOZILLA PRODUCTS

A cybersecurity advisory was issued Tuesday, Nov. 10, 2020, regarding a vulnerability that affects multiple Mozilla products. The vulnerability could allow an attacker to execute remote code, which could potentially lead to a breach.
  

What It Is:

A vulnerability has been discovered in Mozilla Firefox, Firefox Extended Support Release (ESR) and Mozilla Thunderbird, 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 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:

There are currently no reports of this vulnerability being exploited in the wild.

Systems Affected:

• Mozilla Firefox versions prior to 82.0.2
• Mozilla Firefox ESR versions prior to 78.4.0
• Mozilla Thunderbird versions prior to 78.4.1

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 products mentioned above, you will need to apply appropriate updates provided by Mozilla to vulnerable systems immediately following proper testing.

Technical Summary:

A vulnerability has been discovered in Mozilla Firefox, Firefox Extended Support Release (ESR) and Mozilla Thunderbird, which could allow for arbitrary code execution. In certain circumstances, the MCallGetProperty opcode can be emitted with unmet assumptions resulting in an exploitable use-after-free condition. (CVE-2020-26950)

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 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.