Dark Reading 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.

Application Security //

Web Application Development

10:15 AM
Larry Loeb
Larry Loeb
Larry Loeb

Mozilla Leads the Way to Safer Browser Development

Mozilla is looking to make web browsers safer by adding new developer features into Firefox that should make the HTTPS protocol a must-have way to transmit for websites.

In a welcome and long overdue change in direction, browser creators are starting to look at the features that developers include in their code with an eye to security.

Mozilla was the first out of the chute on Monday by announcing that the Application Cache feature of HTML5 will not be working if the information transfer between browser and site does not occur as HTTPS.

Application Cache or AppCache lets developers specify which parts of the site will be available to the users offline. The idea is to give extra functionality to users, improve browser speed and reduce the effective load.

However, there are concomitant security risks when used with HTTP alone. Because the cache is not revalidated in use, malicious content can be loaded in a Man-in-the-Middle type of attack and viewed indefinitely even when the user is offline.

(Source: Wikipedia)
(Source: Wikipedia)

On a non-secured WiFi network, for instance, Johnathan Kingston describes in the Mozilla blog how this attack would work:

Even if the user only visits one HTTP page over the WiFi, the attacker can plant many insecure iframes using AppCache which allows the attacker to rig the cache with malicious content manipulating all of those sites indefinitely. Even a cautious user who decides only to login to their websites at home is at risk due to this stale cache.

This is a potentially huge attack vector, as can be seen.

Kingston goes on to describe what Mozilla is going to do about this. He writes that in Firefox 60+ Beta and Nightly, Application Cache access from HTTP pages will be denied. Not only that, but starting with May's Firefox 62 release, Application Cache over HTTP will be fully removed for all the release channels.

Mozilla is serious about the effort, as are other browser makers. In fact, Chrome, Edge and WebKit have also stated their intent to remove this feature when used over HTTP. This will end up changed in the HTTP standardas well.

This fits in with Mozilla's avowed intention to deprecate HTTP and requiring HTTPS for all new APIs. Not only that, they will be stalwart in their effort to remove features from sites that are served over insecure connections.

The upshot of this effort by all the browser makers is that websites that want to preserve their functionality need to transition to the use of TLS encryption soon. If they don't, these kinds of API depreciations will end up taking their functionality away from them.

Related posts:

— Larry Loeb has written for many of the last century's major "dead tree" computer magazines, having been, among other things, a consulting editor for BYTE magazine and senior editor for the launch of WebWeek.

Comment  | 
Print  | 
More Insights
Newest First  |  Oldest First  |  Threaded View
I Smell a RAT! New Cybersecurity Threats for the Crypto Industry
David Trepp, Partner, IT Assurance with accounting and advisory firm BPM LLP,  7/9/2021
Attacks on Kaseya Servers Led to Ransomware in Less Than 2 Hours
Robert Lemos, Contributing Writer,  7/7/2021
It's in the Game (but It Shouldn't Be)
Tal Memran, Cybersecurity Expert, CYE,  7/9/2021
Register for Dark Reading Newsletters
White Papers
Current Issue
Enterprise Cybersecurity Plans in a Post-Pandemic World
Download the Enterprise Cybersecurity Plans in a Post-Pandemic World report to understand how security leaders are maintaining pace with pandemic-related challenges, and where there is room for improvement.
Flash Poll
Twitter Feed
Dark Reading - Bug Report
Bug Report
Enterprise Vulnerabilities
From DHS/US-CERT's National Vulnerability Database
PUBLISHED: 2021-09-22
Leo Editor v6.2.1 was discovered to contain a regular expression denial of service (ReDoS) vulnerability in the component plugins/importers/dart.py.
PUBLISHED: 2021-09-22
CMS Made Simple 2.2.14 was discovered to contain a cross-site scripting (XSS) vulnerability which allows attackers to execute arbitrary web scripts or HTML via a crafted payload in the Field Definition text field.
PUBLISHED: 2021-09-22
gmate v0.12+bionic contains a regular expression denial of service (ReDoS) vulnerability in the gedit3 plugin.
PUBLISHED: 2021-09-22
The vCenter Server contains a local privilege escalation vulnerability due to the way it handles session tokens. A malicious actor with non-administrative user access on vCenter Server host may exploit this issue to escalate privileges to Administrator on the vSphere Client (HTML5) or vCenter Server...
PUBLISHED: 2021-09-22
The vCenter Server contains a denial-of-service vulnerability due to improper XML entity parsing. A malicious actor with non-administrative user access to the vCenter Server vSphere Client (HTML5) or vCenter Server vSphere Web Client (FLEX/Flash) may exploit this issue to create a denial-of-service ...