Adblock Plus and the canvas fingerprinting threat · 2014-07-23 12:21 by Wladimir Palant
ProPublica recently wrote about canvas fingerprinting which supposedly has even more significant privacy implications than cookies. And the worst of it: unlike cookies, canvas fingerprinting cannot be blocked by Adblock Plus!
Those of you who know Adblock Plus are probably saying now: “What, Adblock Plus can block cookies? I never knew that!” And you are right of course — Adblock Plus doesn’t block cookies. So, what is this canvas fingerprinting and what does it have to do with Adblock Plus?
Google Chrome and pre-installed web apps · 2011-11-15 09:47 by Wladimir Palant
Google recently launched a redesigned version of its Web Store where one can install extensions and web apps. One particular feature caught my attention: it marks the extensions that you already have with a check mark. How does the web page know which extensions you have installed?
Details on the resolved Adblock Plus for Chrome security issue · 2011-08-17 12:55 by Wladimir Palant
Adblock Plus 1.1.4 for Google Chrome has been released today and fixes a minor security issue. This blog post provides some details.
Finding security issues in a website (or: How to get paid by Google) · 2010-12-11 01:40 by Wladimir Palant
I received a payment over $2,500 from Google today. Now the conspiracy theorists among you can go off and rant in all forums that Adblock Plus is sponsored by Google and can no longer be trusted. For those of you who are still with me: the money came though Google’s Vulnerability Reward Program. Recently Google extended the scope of the program to web applications. I took up the challenge and sure enough, in a few hours I found four vulnerabilities in various corners of google.com.
The wrong way to deal with privacy concerns · 2010-05-26 14:30 by Wladimir Palant
Generally, I am not the guy to pick on Google. I think that they usually bring out very solid (often brilliant) solutions and do a good job on the privacy front (meaning: far from perfect but significantly better than the competition). All the more surprising was their release of the Google Analytics Opt-out Browser Add-on which doesn’t quite live up to the expected quality.
One way to get outdated plugins on your computer · 2010-01-28 15:45 by Wladimir Palant
Only two days ago I wrote how browser plugins are the biggest security risk today. And yesterday I experienced first-hand how one would get outdated and insecure plugins installed. I installed Lexware Steuer 2009 (for the German readers: yes, that’s the one you get at Aldi and that always gets good marks in software tests). And then Secunia PSI went berserk warning me about various security threats on my computer. Turned out, this application installed without even telling me: Java Runtime Environment 1.6.0 Update 2 (released July 2007, current version is 1.6.0 Update 18), Flash Player ActiveX 188.8.131.52 (released April 2008, current version is 10.0.42.34), MSXML 4.0 SP2 (released June 2003, current version is 4.0 SP3).
The new browser security landscape · 2010-01-26 12:22 by Wladimir Palant
Brian Krebs came across one of those websites throwing a battery of exploits at users and took a close look at its administration page. It lists seven exploits, the two most successful ones being for Adobe Reader and Java, followed by two Internet Explorer exploits. At the far end of the list two Firefox exploits can be found as well. From what I understand, only one Adobe Reader vulnerability was unpatched at that time, all other vulnerabilities have been fixed already. For example, the Java exploit targets a security hole that was closed in December 2008, the exploited Firefox vulnerabilities have been closed in Firefox 1.0.5 and 184.108.40.206 respectively.
Mercurial over HTTPS - ouch, SSL isn't always secure · 2009-11-18 08:43 by Wladimir Palant
I set up my Mercurial server as HTTPS only. The idea behind it was that establishing a secure communication channel outweighs the disadvantages (server load, more traffic and somewhat slower pull operations) for a small server like that. But then I had second thoughts — I am using a StartCom certificate that isn’t yet accepted everywhere, what if somebody cannot pull the repository because of that?
AMO getting serious about add-on security · 2009-11-14 15:36 by Wladimir Palant
Good news: AMO is finally getting serious about improving security of add-ons. Several bugs that I filed almost a year ago and didn’t have time to follow up on have suddenly seen some movement, even to the point of setting a two weeks deadline to resolve the security issues (thanks, Jorge). Sure, this approach won’t make you new friends and one add-on author preferred to remove his add-ons rather than fix them. But it is really overdue to start enforcing policies.
Getting rid of Flash cookies · 2009-03-02 12:57 by Wladimir Palant
Pretty much every Flash movie on the web today uses Flash Player’s global storage feature to store data on your disk, similar to regular browser cookies. What makes this feature so problematic is the lack of proper control mechanisms. For example, for browser cookies I selected “Keep until I close Firefox” which makes sure that cookies can be set (no site functionality is broken) but won’t survive too long. But this setting won’t apply to Flash data. Same goes for the Private Browsing mode in Firefox 3.1, it has absolutely no effect on Flash. Note also that Flash data is the same for all browsers and all profiles.