Firefox 74.0.1 addresses two zero-days exploited in the wild

Mozilla releases Firefox version 74.0.1 to address two vulnerabilities exploited by threat actors in attacks in the wild, users should update their browsers asap.

Mozilla is urging users to install the latest version of its browser, Firefox 74.0.1, which addresses two bugs that are being exploited in the wild by threat actors.

The two vulnerabilities have been tracked as CVE-2020-6819 and CVE-2020-6820, both issues are user-after-free vulnerabilities that could be exploited to inject code in Firefox’s memory and execute it in the browser’s context.

Both issues are remote code execution vulnerabilities, Mozilla credited the researcher Francisco Alonso @revskills and the expert Javier Marcos of @JMPSecsecurity for the two issues.

Mozilla did not disclose technical details of the vulnerabilities.

According to Alonso, other browsers might have been impacted by both zero-day vulnerabilities. Below the descriptions the two flaws:

“Under certain conditions, when running the nsDocShell destructor, a race condition can cause a use-after-free. We are aware of targeted attacks in the wild abusing this flaw.” reads the advisory for the CVE-2020-6819 flaw.

“Under certain conditions, when handling a ReadableStream, a race condition can cause a use-after-free. We are aware of targeted attacks in the wild abusing this flaw.” reads the advisory for the CVE-2020-6820 flaw.

In January, Mozilla has released security updates for Firefox browser that addresses another zero-day vulnerability, tracked as CVE-2019-17026, that has been exploited in targeted attacks.

Researchers at Qihoo 360 and Japan CERT revealed that an APT group is exploiting two vulnerabilities, including the CVE-2019-17026 flaw, in attacks aimed at China and Japan.

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Pierluigi Paganini

(SecurityAffairs – Firefox, hacking)

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Pierluigi Paganini

Pierluigi Paganini is member of the ENISA (European Union Agency for Network and Information Security) Threat Landscape Stakeholder Group and Cyber G7 Group, he is also a Security Evangelist, Security Analyst and Freelance Writer. Editor-in-Chief at "Cyber Defense Magazine", Pierluigi is a cyber security expert with over 20 years experience in the field, he is Certified Ethical Hacker at EC Council in London. The passion for writing and a strong belief that security is founded on sharing and awareness led Pierluigi to find the security blog "Security Affairs" recently named a Top National Security Resource for US. Pierluigi is a member of the "The Hacker News" team and he is a writer for some major publications in the field such as Cyber War Zone, ICTTF, Infosec Island, Infosec Institute, The Hacker News Magazine and for many other Security magazines. Author of the Books "The Deep Dark Web" and “Digital Virtual Currency and Bitcoin”.