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Zero-Day Firefox Flaw Exploited By Criminals
Posted Oct 27, 2010

tags | flaw, mozilla, firefox, zero day

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Mozilla Fixes 32 Vulnerabilities In Firefox 54
Posted Jun 15, 2017
Source Threatpost

tags | headline, flaw, patch, mozilla, firefox
Mozilla Races To Patch Bug Used To Attack Tor Browser Users
Posted Nov 30, 2016
Source ZDNet

tags | headline, hacker, privacy, malware, flaw, mozilla, firefox, zero day, fbi
Mozilla Patches 29 Vulns In Firefox 50
Posted Nov 17, 2016
Source Threatpost

tags | headline, flaw, patch, mozilla, firefox
130 Serious Firefox Holes Plugged This Year
Posted Oct 31, 2016
Source The Register

tags | headline, flaw, patch, mozilla, firefox
Millions Of Firefox Users Vulnerable To Browser Extension Flaw
Posted Apr 6, 2016
Source V3

tags | headline, flaw, mozilla, firefox
Mozilla Admits Bugzilla Account Hack Led To Firefox Attacks
Posted Sep 7, 2015
Source V3

tags | headline, hacker, data loss, flaw, mozilla, firefox
Quick! Update Firefox To Foil File-Stealing Vulnerability Exploit
Posted Aug 7, 2015
Source The Register

tags | headline, russia, data loss, flaw, mozilla, firefox
Mozilla Blocks Flash From Firefox Browsers
Posted Jul 14, 2015
Source V3

tags | headline, flaw, adobe, mozilla, firefox
Firefox 39 Bites Four Critical Bugs
Posted Jul 6, 2015
Source The Register

tags | headline, flaw, patch, mozilla, firefox
Mozilla Doubles Bug Bounties To $10k
Posted Jun 11, 2015
Source The Register

tags | headline, flaw, mozilla, firefox
Firefox Already Pulls Opportunistic Encryption Patch
Posted Apr 7, 2015
Source ars technica

tags | headline, flaw, mozilla, firefox, cryptography
All Four Major Browsers Take A Stomping At Pwn2Own Hacking Contest
Posted Mar 23, 2015
Source ars technica

tags | headline, microsoft, flaw, google, mozilla, firefox, chrome, conference
Chrome Splatters 51 Bugs, Mozilla Bumps Cert Checker
Posted Mar 5, 2015
Source The Register

tags | headline, flaw, google, patch, mozilla, firefox, chrome
Firefox 35 Stamps Out Critical Bugs
Posted Jan 19, 2015
Source The Register

tags | headline, flaw, patch, mozilla, firefox
Why Are There More Browser Vulnerabilities These Days?
Posted Nov 11, 2014
Source ZDNet

tags | headline, microsoft, flaw, google, patch, mozilla, firefox, chrome
Latest Firefox / Thunderbird Updates Plug Critical SSL Vuln
Posted Sep 25, 2014
Source The Register

tags | headline, privacy, flaw, mozilla, firefox, cryptography
Mozilla Fixes Critical Security Holes In Firefox, Urges Upgrade
Posted Jul 24, 2014
Source The Register

tags | headline, flaw, patch, mozilla, firefox
Mozilla Releases Five Critical Firefox 30 Security Fixes
Posted Jun 11, 2014
Source V3

tags | headline, flaw, patch, mozilla, firefox
NSA Using Firefox Flaw To Snoop On Tor Users
Posted Oct 4, 2013
Source The Register

tags | headline, government, privacy, usa, flaw, mozilla, firefox, nsa
Mozilla's Firefox 24 Comes With 17 Security Fixes
Posted Sep 18, 2013
Source The Inquirer

tags | headline, flaw, patch, mozilla, firefox
Quarter Of Web Users Run Outdated Browsers, Says Kaspersky
Posted Nov 9, 2012
Source V3

tags | headline, microsoft, flaw, google, mozilla, firefox, chrome
Mozilla Pulls Firefox 16 Over Vulnerability
Posted Oct 11, 2012
Source Mozilla Blog

tags | headline, flaw, mozilla, firefox
Firefox Thumbnails Could Expose Private Data
Posted Jun 25, 2012
Source ZDNet

tags | headline, privacy, data loss, flaw, mozilla, firefox
Mozilla Knew Of Pwn2Own Bug Before CanSecWest
Posted Mar 14, 2012
Source ZDNet

tags | headline, flaw, mozilla, firefox, conference
Book Review: 'The Tangled Web' By Michal Zalewski
Posted Feb 11, 2012
Source Packet Storm

No Starch Press: $49.95

If you are a security engineer, a researcher, a hacker or just someone who keeps your ear to the ground when it comes to computer security, chances are you have seen the name Michal Zalewski. He has been responsible for an abundance of tools, research, proof of concepts and helpful insight to many over the years. He recently released a book called "The Tangled Web - A Guide To Securing Modern Web Applications".

Normally, when I read books about securing web applications, I find many parallels where authors will give an initial lay of the land, dictating what technologies they will address, what programming languages they will encompass and a decent amount of detail on vulnerabilities that exist along with some remediation tactics. Such books are invaluable for people in this line of work, but there is a bigger picture that needs to be addressed and it includes quite a bit of secret knowledge rarely divulged in the security community. You hear it in passing conversation over beers with colleagues or discover it through random tests on your own. But rarely are the oddities documented anywhere in a thorough manner.

Before we go any further, let us take a step back in time. Well over a decade ago, the web was still in its infancy and an amusing vulnerability known as the phf exploit surfaced. It was nothing more than a simple input validation bug that resulted in arbitrary code execution. The average hacker enjoyed this (and many more bugs like it) during this golden age. At the time, developers of web applications had a hard enough time getting their code to work and rarely took security implications into account. Years later, cross site scripting was discovered and there was much debate about whether or not a cross site scripting vulnerability was that important. After all, it was an issue that restricted itself to the web ecosystem and did not give us a shell on the server. Rhetoric on mailing lists mocked such findings and we (Packet Storm) received many emails saying that by archiving these issues we were degrading the quality of the site. But as the web evolved, people starting banking online, their credit records were online and before you knew it, people were checking their social network updates on their phone every five minutes. All of a sudden, something as small as a cross site scripting vulnerability mattered greatly.

To make the situation worse, many programs were developed to support web-related technologies. In the corporate world, being first to market or putting out a new feature in a timely fashion trumphs security. Backwards compatibility that feeds poor design became a must for any of the larger browser vendors. The "browser wars" began and everyone had different ideas on how to solve different issues. To say web-related technologies brought many levels of complexity to the modern computing experience is a great understatement. Browser-side programming languages, such as JavaScript, became a playground for hackers. Understanding the Document Object Model (DOM) and the implications of poorly coded applications became one of those lunch discussions that could cause you to put your face into your mashed potatoes. Enter "The Tangled Web".

This book puts some very complicated nuances in plain (enough) english. It starts out with Zalewski giving a brief synopsis of the security industry and the web. Breakdowns of the basics are provided and it is written in a way that is inviting for anyone to read. It goes on to cover a wide array of topics inclusive to the operation of browsers, the protocols involved, the various types of documents handled and the languages supported. Armed with this knowledge, the reader is enabled to tackle the next section detailing browser security features. As the author puts it, it covers "everything from the well-known but often misunderstood same-origin policy to the obscure and proprietary zone settings of Internet Explorer". Browsers, it ends up, have a ridiculous amount of odd dynamics for even the simplest acts. The last section wraps things up with upcoming security features and various browser mechanisms to note.

I found it a credit to the diversity of the book that technical discussion could also trail off to give historical notes on poor industry behavior. When it noted DNS hijacking by various providers it reminded me of the very distinct and constantly apparent disconnect between business and knowledge of technology. When noting how non-HTTP servers were being leveraged to commit cross site scripting attacks, Zalewski also made it a point to note how the Internet Explorer releases only have a handful of prohibited ports but all other browsers have dozens that they block. The delicate balance of understanding alongside context is vital when using information from this book and applying it to design.

Every page offers some bit of interesting knowledge that dives deep. It takes the time to note the odd behaviors small mistakes can cause and also points out where flawed security implementations exist. This book touches on the old and the new and many things other security books have overlooked. Another nice addition is that it provides security engineering cheatsheets at the end of each chapter. To be thorough, it explains both the initiatives set out by RFCs while it also documents different paths various browser vendors have taken in tackling tricky security issues. Google's Chrome, Mozilla's Firefox, Microsoft's Internet Explorer, Apple's Safari and Opera are compared and contrasted greatly throughout this book.

In my opinion, the web has become a layer cake over the years. New shiny technologies and add-ons have been thrown into the user experience and with each of them comes a new set of security implications. One-off findings are constantly discovered and documented (and at Packet Storm we try to archive every one of them), but this is the first time I have seen a comprehensive guide that focuses on everything from cross-domain content inclusion to content-sniffing. It is the sort of book that should be required reading for every web developer.

 -Todd

tags | headline, microsoft, flaw, google, mozilla, opera, apple, firefox, chrome
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