I've just got a set of wearable NFC tags, and I've discovered something interesting about the way data is stored on them. tl;dr Overwriting a tag can leave old data intact, and still readable. Here's the decoded memory layout of a tag with data written to it. In this case, a (failed) experiment at storing… Continue reading →
Code-sharing site GitHub automatically sends email notifications to users. If you've commented on an issue, you'll get an email each time there's an update. That's pretty handy. It also allows users to reply by email. The reply is then automatically posted in the issue thread. Also handy. But a little dangerous. Lots of people have… Continue reading →
There's a new bug bounty provider in town! The Belgian company Intigriti. This is a quick write-up of how I found a trivial bug in their own system. The EU has announced that it is providing funding for bug bounties on critical open source projects. They've split the programme between HackerOne and Intigriti. I signed… Continue reading →
Imagine the scenario. You're trying out some cool new Twitter app. It asks you to sign in via OAuth as per usual. You look through the permissions - phew - it doesn't want to access your Direct Messages. You authorise it - whereupon it promptly leaks to the world all your sexts, inappropriate jokes, and… Continue reading →
A few months ago, British Airways' customers had their credit card details stolen. How was this possible? The best guess goes something like this: BA had 3rd party JS on its payment page <script src="https://example.com/whatever.js"></script> The 3rd party's site was hacked, and the JS was changed. BA's customers ran the script, which then harvested their… Continue reading →
Here's a curiosity which I found while stumbling through the Sony PlayStation store. The website loads internally hosted scripts using SRI (SubResource Integrity). Why? Does your work require you to swipe an ID card to access the building? That seems pretty normal. Does your work also remind you to keep your badge visible, and to… Continue reading →
Some external JavaScript libraries are dynamic. That's a problem for the SRI model of security. How can this be fixed? Definitions Suppose I want my website to have the latest version of the jQuery library. I might use a Content Delivery Network (CDN) to serve the code for me. <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script> If an attacker were… Continue reading →
CloudFlare claim they want to secure the web - but they seem more interested in tracking their customers than giving them decent security. Upon registering with the Internet giant, users are encouraged to confirm their email addresses. So far, so standard. This is the confirmation message CloudFlare sends out: Looks good! Hey! I wonder where… Continue reading →
One of the problems with the BlockChain goldrush is that it attracts a lot of people who don't necessarily have the required technical skill to safely run a service. This in turn reduces trust in the ecosystem. I'd like to discuss ArtChain.info - "Certifying Art Using the Bitcoin Blockchain" - and the some of the… Continue reading →
A quick report into a nasty privacy vulnerability I found with the CAB. Unusually for me, this has no Internet component. Regular readers will know about my recent court visit. As part of that, I had to telephone the CAB Volunteers at the court who look after witnesses. I called, and was put on hold,… Continue reading →