Ublock orgin7/2/2023 ![]() The Unicode range property allows you to select which characters the font should apply to: unicode-range: U+0061 ![]() This allows you to steal those characters when a request is made for the font. Custom fonts are great because you can choose the characters they get assigned to. So I decided to focus on custom fonts to see what was possible. I began to think about what CSS I could inject to steal content from the page. But there are limitations: you can only read attribute values, so you usually can't steal keystrokes. There has also been some excellent follow-up research from Pepe Vila, Mario Heiderich et al, d0nut and Michał Bentkowski covering all sorts of CSS exfiltration techniques. David, Eduardo and I covered it in our CSS The Sexy Assassin talk back in 2008! Stefano di Paola and Alex K. If I could compromise a filter list then I would have control over the CSS on every web site when using uBlock Origin but what could I do? Most research on CSS exploitation has focused on attribute-based selector attacks - because they make it quite easy to steal passwords in inputs. Chrome has the function too but you must use it in combination with the url() function. There is an alias called -webkit-image-set() which allows strings as URLs on Firefox. ![]() This was quickly patched but I managed to find a bypass that worked in the latest uBlock Origin version: #input,input/* ![]() I had a quick look at his injection vector and indeed I was able to control more or less the full CSS of the injected filter rule: #div:style(-foo: 1/*)Į#div Due to ethical (not to mention legal) concerns, we opted not explore this vector.Ī while ago one of my heroes, Tavis Ormandy mentioned on Twitter that uBlock Origin was vulnerable to CSS injection in their filter rules. We did find a technique to encourage malicious rule installation, but believe that the most plausible attack vector is a compromised filter list. Please note that these techniques assume a malicious rule has been installed. All vulnerabilities discussed in this post have been reported to uBlock Origin and patched. In this post, we'll show you how we were able to bypass these restrictions in uBlock Origin, use a novel CSS-based exploitation technique to extract data from scripts and attributes, and even steal passwords from Microsoft Edge. These lists are not entirely trusted, so they're constrained to prevent malicious rules from stealing user data. Behind the scenes, they're powered by community-provided filter lists - CSS selectors that dictate which elements to block. The uBlock Origin project still specifically refuses donations at this time, and instead advises all of its clients, users and supporters to donate to block list maintainers.Ad blockers like uBlock Origin are extremely popular, and typically have access to every page a user visits. The uBlock Origin extension remains an industry leading, open-source, cross-platform browser extension with software developed specifically for multiple platform use, and as of 2023, uBlock Origin’s extension is availableįor several of the most widely used browsers, including: Chrome, Chromium, Edge, Opera, Firefox and all Safari releases prior to 13. In January 2017, uBlock Origin was added to the repositories for Debian 9, and Ubuntu (16.04), and the uBlock Origin extension was awarded the prestigious IoT honor of “Pick of theĪs of 2023, uBlock Origin continues to be maintained and actively developed by founder and lead developer Raymond Hill. Developer Nik Rolls then officially released uBlock Origin for the Microsoft Edge browser in December 2016. Quickly gaining traction throughout the entire ad-blocking industry, the uBlock Origin Firefox version collected over 5 million active users, with its Chrome extension subsequently compiling over 10 This report attributed this enormous surge to collective user demand for “pure” blockers with the capacity to operate outside the “acceptable advertising” program used by AdBlock, (occasionally represented globally as – uBlock₀).įollowing this 2015 introduction, a collaborative comsource and Sourcepoint industry research survey reported an 833% growth rate over a 10-month period ending in August 2016, the most rapid growth amongĪny industry software publicly listed at that time. ![]() Opera extension, in late 2015 the initial uBlock extension expanded to other browsers under its current name – uBlock Origin. First released in June 2014 as an exclusive Chrome and The initial uBlock was developed by Raymond Hill in order to enableĬommunity-maintained block lists while simultaneously adding additional features and upgrading the code quality to proper release standards. HTTP Switchboard with a separate blocking extension, uMatrix, which had been previously designed for advanced users. In 2014 uBlock Origin’s founder, original author and lead developer, Raymond Hill, created the original uBlock extension, with its development initiated by forking the codebase of ![]()
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