U.S.-CERT Warns Of Rogue Code For Firefox Flaw - InformationWeek

InformationWeek is part of the Informa Tech Division of Informa PLC

This site is operated by a business or businesses owned by Informa PLC and all copyright resides with them.Informa PLC's registered office is 5 Howick Place, London SW1P 1WG. Registered in England and Wales. Number 8860726.

IoT
IoT
News

U.S.-CERT Warns Of Rogue Code For Firefox Flaw

A new proof-of-concept code is circulating for a Firefox vulnerability that was fixed in Mozilla's security update that was released last week.

The U.S. Computer Emergency Response Team (CERT) issued a warning on Wednesday that a proof-of-concept code is circulating in the wild that could be vulnerability in Mozilla's Firefox browser.

The memory corruption vulnerability in Mozilla's flagship, open-source browser exists due to a flaw in the way Firefox handles freed data structures modified in the onUnload event handler, according to a U.S.-CERT advisory. That flaw can cause a memory corruption error.

Firefox, another U.S.-CERT advisory warns, does not properly handle JavaScript "onUnload" events. This vulnerability may lead to memory corruption that could allow a remote, unauthenticated attacker to execute arbitrary code on a vulnerable system.

Mozilla's security update, which was released last week, does fix the memory corruption issue, though the company had not made that public initially.

"The Firefox 2.0.0.2 update includes fixes for the bugs that researcher Michal Zalewski reported last week, including the hostname vulnerability, cookie issue and memory corruption issue," wrote Window Snyder, Mozilla's chief security officer, in an e-mail to InformationWeek. "Due to the security fixes, we strongly recommend that all Firefox users upgrade to this latest release." The upgrade is available at this Web site.

The JavaScript onUnload event defines the actions taken when the browser exits a Web page. According to U.S.-CERT, users can download the Firefox update but they also could disable JavaScript to fend off the exploit.

We welcome your comments on this topic on our social media channels, or [contact us directly] with questions about the site.
Comment  | 
Print  | 
More Insights
State of the Cloud
State of the Cloud
Cloud has drastically changed how IT organizations consume and deploy services in the digital age. This research report will delve into public, private and hybrid cloud adoption trends, with a special focus on infrastructure as a service and its role in the enterprise. Find out the challenges organizations are experiencing, and the technologies and strategies they are using to manage and mitigate those challenges today.
Commentary
Why It's Nice to Know What Can Go Wrong with AI
James M. Connolly, Editorial Director, InformationWeek and Network Computing,  11/11/2019
Slideshows
Top-Paying U.S. Cities for Data Scientists and Data Analysts
Cynthia Harvey, Freelance Journalist, InformationWeek,  11/5/2019
Slideshows
10 Strategic Technology Trends for 2020
Jessica Davis, Senior Editor, Enterprise Apps,  11/1/2019
Register for InformationWeek Newsletters
Video
Current Issue
Getting Started With Emerging Technologies
Looking to help your enterprise IT team ease the stress of putting new/emerging technologies such as AI, machine learning and IoT to work for their organizations? There are a few ways to get off on the right foot. In this report we share some expert advice on how to approach some of these seemingly daunting tech challenges.
White Papers
Slideshows
Twitter Feed
Sponsored Live Streaming Video
Everything You've Been Told About Mobility Is Wrong
Attend this video symposium with Sean Wisdom, Global Director of Mobility Solutions, and learn about how you can harness powerful new products to mobilize your business potential.
Sponsored Video
Flash Poll