Mozilla urges Firefox users to patch browsers immediately

A critical zero-day flaw that allows remote access and control is being actively exploited in the wild

Firefox offices

Mozilla has released an emergency update to its Firefox browser to fix a critical vulnerability that is allowing attackers to seize control of users' machines.

Versions 67.0.3 and ESR 60.7.1 has been released to users on Windows, macOS and Linux desktop machines to mitigate a zero-day vulnerability dubbed CVE-2018-11707. The flaw does not arise or on Android, iOS or Amazon Fire TV iterations of the browser.

When exploited, it allows an attacker to execute arbitrary code on flawed machines and is being actively exploited in the wild, according to Mozilla. This could allow cyber criminals to seize full control if a system.

The critical vulnerability was discovered by Samuel Gro from Google Project Zero, and involves what is referred to as type confusion in Array.pop. When triggered, this can lead to an exploitable crash due to issues which occur when the browser attempts to manipulate JavaScript objects.

Mozilla deems a vulnerability to be 'critical' when it can be used to run code and install software without any user interaction required beyond normal browsing.

Highly severe zero-day flaws aren't uncommon, but they are often found and mitigated with patches by developers before cyber criminals are able to discover them and begin attacking users remotely.

The previous critical zero-day flaws that Mozilla discovered in Firefox 67 and Firefox ESR 60.7 were memory safety bugs flagged on 21 May this year. On this occasion, attackers were not found to be exploiting the vulnerabilities.

Another high-profile Firefox vulnerability was discovered last year by security researchers independent of Mozilla. After networking giant Cisco flagged an issue that could allow remote attackers to execute malicious code, the developers issued an emergency patch and urged users to update their browsers.

The news also comes at a time in which Mozilla is planning to introduce a host of security and privacy-centric features within Firefox, including tools such as secure storage, and a virtual private network (VPN).

Many of these new features could arise in a subscription-based version of the Firefox browser, which the developer last week hinted may surface before the end of 2019.

Featured Resources

Unleashing the power of AI initiatives with the right infrastructure

What key infrastructure requirements are needed to implement AI effectively?

Download now

Achieve today. Plan tomorrow. Making the hybrid multi-cloud journey

A Veritas webinar on implementing a hybrid multi-cloud strategy

Download now

A buyer’s guide for cloud-based phone solutions

Finding the right phone system for your modern business

Download now

The workers' experience report

How technology can spark motivation, enhance productivity and strengthen security

Download now

Recommended

SonicWall hacked via zero-day flaw in remote access tools
Security

SonicWall hacked via zero-day flaw in remote access tools

25 Jan 2021
Best ransomware removal tools
ransomware

Best ransomware removal tools

22 Jan 2021
Hackers publish over 4,000 files stolen from SEPA in ransomware attack
Security

Hackers publish over 4,000 files stolen from SEPA in ransomware attack

22 Jan 2021
Weekly threat roundup: SAP, Windows 10, Chrome
vulnerability

Weekly threat roundup: SAP, Windows 10, Chrome

21 Jan 2021

Most Popular

How to move Windows 10 from your old hard drive to SSD
operating systems

How to move Windows 10 from your old hard drive to SSD

21 Jan 2021
WhatsApp could face €50 million GDPR fine
General Data Protection Regulation (GDPR)

WhatsApp could face €50 million GDPR fine

25 Jan 2021
Trump pardons convicted ex-Google engineer Levandowski
intellectual property

Trump pardons convicted ex-Google engineer Levandowski

20 Jan 2021