Unfortunately for Coinbase, it looked like they made a mistake with their regular expression to sanitize this input and were only checking that or occurred anywhere in the provided URL. At first, it looked like they were checking if the callback URLs were valid and began with or and were blocking my basic attempts to redirect users to javascript: addresses. Merchants have the ability to set up checkout pages, which they can direct users and easily receive bitcoin payments. #Īfter reporting the first XSS vulnerability, I continued searching their website. Persistent XSS on Merchant Checkout Pages. The Coinbase team still sent me 1 BTC for it. I reported the vulnerability to Coinbase but who referred me to the Coinbase bug bounty program had reported it independently a few hours before. Bingo! We have found a reflected XSS vulnerability on Coinbase with a known vulnerability in third party code (CVE-2013-1808). In this case it was also uploaded but not referenced. swf file is typically bundled with ZeroClipboard10.swf. I recalled reading an advisory about this swf file before, but on first tests it did not appear to be exploitable. I quickly saw references to a file, in the main CSS file. Previously I have had some successes finding XSS vulnerabilities in Flash. This was supported by the fact Coinbase’s founder Brian Armstrong had a lot of Ruby snippets on his Github Gist and some more Ruby questions on his Stack Overflow account. I quickly determined it was running Ruby on Rails based on the encoding of the “_coinbase_session” cookie. When I first started analyzing the Coinbase website I had a quick look over the site layout and the functionality/attack surface available for potential exploitation. What the hell is happening to Canada’s banks right now? – Owning a Bitcoin Exchange Bug Bounty Program Jun 24 2013 Related: Crypto community condemns Canada for freezing dissidents’ Bitcoin ( $0.00 ) walletsĪccording to some reports, Justin Trudeau’s financial crackdown on vaccine protesters could have triggered bank runs among the major banks in Canada and ATMs going offline. Morgan Creek Digital co-founder Anthony Pompliano also pointed out previously that authoritarian moves by countries like Canada are “Bitcoin’s marketing team.”Īuthoritarian governments are Bitcoin’s marketing team. But still shows the situation in Canada is going to accelerate Bitcoin ( $0.00 ) adoption,” crypto podcaster Neil Jacobs noted. “Tons of falsehoods in this article about Bitcoin. Hansson’s transformation from a Bitcoin ( $0.00 ) skeptic to a Bitcoin ( $0.00 ) supporter in response to Canada’s invoked Emergencies Act is another example of the growing crypto adoption fueled by the somewhat excessive involvement of the state. Instead of appreciating the fundamental freedom to transact that it’s currently our best shot at protecting.” “It’s clear to me now that I was too hasty to completely dismiss crypto on the basis of all the things wrong with it at the moment. He noted that some of his biggest arguments against Bitcoin ( $0.00 ) were the cryptocurrency’s energy consumption, transaction fees, the lack of real decentralization, supposed fraud involving Tether (USDT) stablecoin and many others.īut all these arguments do not provide enough reasons to disregard cryptocurrencies as a tool to support freedom and democracy in situations where countries like Canada impose martial law in response to peaceful protest movements, Hansson argued, stating: In a blog post titled “I was wrong, we need crypto,” the Danish programmer mentioned that he’s been skeptical about Bitcoin ( $0.00 ) and the crypto industry in general since the early 2010s. And for me to have to slice a piece of humble pie, and admit that I was wrong on crypto’s fundamental necessity in Western democracies.” “I still can’t believe that this is the protest that would prove every Bitcoin ( $0.00 ) crank a prophet. And for me to have to slice a piece of humble pie, and admit that I was wrong on crypto’s fundamental necessity in Western democracies,” Hansson wrote. Canada’s move to freeze Bitcoin ( $0.00 ) (BTC) wallets and bank accounts related to the COVID-19 vaccine protests is driving cryptocurrency adoption, with some crypto naysayers reconsidering their stance on Bitcoin.ĭavid Heinemeier Hansson, the Ruby on Rails web development framework creator, took to Twitter on Monday to tell his followers that he was no longer a Bitcoin ( $0.00 ) skeptic.
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