Archive for the XSS Category

ABE Quantum is the combination of Contextual Policies, one of the most requested features in NoScript's history, and LAN protection, an important "Classic" defense lost in the 2017 Quantum migration.

After years of waiting and months of hard work, this good stuff (which I personally missed a lot, too) is finally in the hands of all NoScript 11.3 users*, thanks to the precious support by the NLNet Foundation and the Next Generation Internet programme (more specifically the NGI0 PET fund).

The "ABE Quantum" nickname comes, of course, from the Application Boundary Enforcer module of NoScript Classic, which both Contextual Policies and LAN protection are in a sense a "modernized" descendant of, sacrificing some of the extreme flexibility of the original's firewall-inspired policy definition language in order to provide a simpler, more accessible and more intuitive user experience directly integrated in NoScript's main CUSTOM UI.

ABE Quantum Screenshot

Contextual Policies

Contextual policies let you assign different permissions (or "enable different capabilities", in NoScript's parlance) to a certain site depending on its context, i.e. which is the top level site (the address currently shown in the navigation bar).

For instance, you might want to enable scripts from only if you're visiting - intrigued by Maone's awesome embedded tweet feed ;) - but not elsewhere, because you don't like Twitter to track you everywhere you go:

  1. While on, open NoScript's popup and select CUSTOM as the policy for You'll see a new drop down box, initially set to ANY SITE.
  2. Remove all the capabilities (e.g. script) you don't want Twitter to use on ANY SITE (notice that when CUSTOM is selected first time, the capabilities from the previously selected preset get copied, so if it was DEFAULT you can probably leave them that way).
  3. Then select from the drop down, and switch script, fetch and frame (the capabilities outlined in red, meaning they're are needed by on.

You're done: scripts from are allowed to run only when the main site displayed is
You can repeat this on any website (including itself) where you want Twitter scripts and subdocuments to work normally.
If you change your mind, you can reset some or all the contextual policies you previously set in the CUSTOM permissions deck, either on from the popup (only for the current context) or from the Options>Per-site permissions panel, where all the context sites you had configured plus the ANY SITE default are listed in the Enable these capabilities when top page matches... dropdown.

LAN Protection

Simply put, the LAN capability lets documents coming from the public Internet (AKA World Area Network / WAN) to link / send requests to hosts inside your Local Area Network (LAN), which is pretty what they can do now, allowing so called cross-zone CSRF/XSS attacks.
By keeping it disabled (the factory setting in the DEFAULT and UNTRUSTED presets), you're replicating this feature from "Classic" NoScript, without the hassle of going through ABE's firewall-like rules when you need to set an exception, which now is just a matter of checking the LAN capability box.

The Contextual Policies & LAN Protection (ABE Quantum) project was funded through the NGI0 PET Fund, a fund established by NLnet with financial support from the European Commission's Next Generation Internet programme, under the aegis of DG Communications Networks, Content and Technology under grant agreement No 825310.

* already available in auto-update from AMO, still waiting for review at the Chrome Store while writing this post.

I'm pleased to announce that, some hours ago, the first public beta of cross-browser NoScript (10.6.1) passed Google's review process and has been published on the chrome web store.
This is a major milestone in NoScript history, started on May the 13th 2005 (next year we will celenbrate our 15th birthday!). NoScript on the chrome web store

Over all these years NoScript has undergone many transformations, porting and migrations:

  • three distinct Android portings (one for Fennec "classic", one for Firefox Mobile, the last as a WebExtension);
  • one partial rewrite, to make it multi-process compatible;
  • one full, long and quite dramatic rewrite, to migrate it to the WebExtensions API (in whose design and implementation Mozilla involved me as a contributor, in order to make this possible).

And finally today we've got an unified code-base compatible both with Firefox and Chromium, and in possibly in future with other browsers supporting the WebExtensions API to a sufficient extent.
One difference Chromium users need to be aware of: on their browser NoScript's XSS filter is currently disabled: at least for the time being they'll have to rely on the browser's built-in "XSS Auditor", which unfortunately over time proved not to be as effective as NoScript's "Injection Checker". The latter could not be ported yet, though, because it requires asynchronous processing of web requests: one of the several capabilities provided to extensions by Firefox only. To be honest, during the "big switch" to the WebExtensions API, which was largely inspired by Chrome, Mozilla involved me in its design and implementation with the explicit goal to ensure that it supported NoScript's use cases as much as possible. Regrettably, the additions and enhancements which resulted from this work have not picked up by Google.

Let me repeat: this is a beta, and I urge early adopters to report issues in the "Support" section of the NoScript Forum, and more development-oriented ones to file technical bug reports and/or contribute patches at the official source code repository. With your help as beta testers, I plan to bless NoScript 11 as a "stable Chromium-compatible release" by the end of June.

I couldn't thank enough the awesome Open Technology Fund folks or the huge support they gave to this project, and to NoScript in general. I'm really excited at the idea that, under the same umbrella, next week Simply Secure will start working on improving NoScript's usability and accessibility. At the same time, integration with the Tor Browser is getting smoother and smoother.

The future of NoScript has never been brigther :)

See also ZDNet's and GHacks' coverage of the announcement.

NSA++, NoScript on Android

NSA++ (NoScript Anywhere Plus Plus, or NoScript 3.5 alpha for Android Native) has been in the works for a while now, and it’s finally ready for prime time, thanks also to the continuous help of the NLNet Foundation.

Even if it’s not as complete as its legacy Electrolysis-orphaned obsolete predecessor (NSA, designed for the now discontinued XUL Fennec, AKA Firefox 4 Mobile) yet, NSA++ already provides the best security you can get in any mobile browser: beside its trademark flexible script blocking facility, it features the first ever and still strongest XSS filter available, plus partial but functional portings of the unique ClearClick anti-Clickjacking technology and ABE’s firewall/LAN CSRF protection.

You can read more or try it with a recent Firefox Nightly (mobile or desktop, too!) on the NSA project page.

Universal XSS 0day in Adobe Flash controlled users' Web accounts:

As useful as sandboxes are in restricting potentially buggy code to a small part of the operating system, they do nothing to minimize the damage that can be done by attacks that exploit universal XSS flaws, researchers said.

I was already preaching this four years ago: the more our assets move "in the cloud", the less traditional security measures, meant to protecting just your local system, suffice.

The battlefield is the web now, and there's no coming back...

ClearClick anti-Clickjacking on Android

NoScript 3.0a3 for Firefox Mobile is out, bringing three of the major "classic" NoScript features to your Android smartphones:

  1. Easy per-site active content permissions management.
  2. The first and most powerful anti-XSS (cross-site scripting) filter available in a web browser.
  3. ClearClick, the one and only effective client-side protection against Clickjackings available on the client side.

Still some road ahead for convergence between the desktop and the mobile versions, but we're already past the biggest challenges...

A huge thanks to the NLNet foundation, and to many individuals, institutions and companies using NoScript, for their generous support to this project.

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