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  1. Coinomi wallet bug sends users' secret passphrases to Google's Spellcheck API via HTTP, in plaintext. The Coinomi wallet app sends user passwords to Google's spellchecking service in clear text, exposing users' accounts and their funds to man-in-the-middle (MitM) attacks during which attackers can log passwords and later empty accounts. The issue came to light yesterday after an angry write-up by Oman-based programmer Warith Al Maawali who discovered it while investigating the mysterious theft of 90 percent of his funds. Al Maawali says that during the Coinomi wallet setup, when users select a password (passphrase), the Coinomi app grabs the user's input inside the passphrase textbox and silently sends it to Google's Spellcheck API service. "To understand what's going on, I will explain it technically," Al Maawali said. "Coinomi core functionality is built using Java programming language. The user interface is designed using HTML/JavaScript and rendered using integrated Chromium (Google's open-source project) based browser." Al Maawali says that just like any other Chromium-based app, it comes integrated with various Google-centered features, such as the automatic spellcheck feature for all user input text boxes. The issue appears to be that the Coinomi team did not bother to disable this feature in their wallet's UI code, leading to a situation where all their users' passwords are leaking via HTTP during the setup process. Anyone in a position to intercept web traffic from the wallet app would be able to see the Coinomi wallet app passphrase in cleartext. This passphrase lets attackers gain access to a user's wallet (via the restore wallet function) and all the cryptocurrency accounts associated with that wallet --and implicitly all the users' funds. While Al Maawali doesn't have definitive proof that this is how hackers stole his funds, he claims that only Coinomi-stored funds were stolen, so he sees no other way hackers might have gained access to those accounts besides gaining access to his Coinomi passphrase. "Anyone who is involved in technology and crypto-currency knows that [...] 12 random English words separated by spaces will probably be a passphrase to a crypto-currency wallet," Al Maawali said. The researcher created a dedicated website where he described the issue and the ordeal he went through trying to get Coinomi to acknowledge the vulnerability. He also posted a proof-of-concept video that was later independently verified and reproduced by Luke Childs, a security researcher, and fellow cryptocurrency aficionado. Childs is no stranger to Coinomi issues. Back in 2016, he discovered that the Coinomi Android app was communicating with its backend servers via plaintext HTTP. Just like in Al Maawali's case, Coinomi refused to acknowledge the issue and later deleted Childs' bug report after a heated private exchange --detailed in depth on this page. Coinomi, which offers a multi-cryptocurrency wallet app for Android, iOS, Linux, Mac, and Windows, did not respond to a request for comment. Al Maawali claims he lost between $60,000 and $70,000 worth in different cryptocurrencies. There are also other reports on Coinomi's Reddit thread where users are complaining about waking up one day to find all their Coinomi-managed accounts emptied overnight [1, 2]. Source
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