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MORE OPTIONSAGREE Skip to main content TechRadar pro IT insights for business Search Subscribe RSS US Edition Asia India Singapore Middle East Africa South Africa Europe Danmark Suomi Norge Sverige UK Italia Nederland België (Nederlands) France Deutschland España North America US (English) Canada US (Español) Australasia Australia New Zealand Technology Magazines Why subscribe? * The best tech tutorials and in-depth reviews * Try a single issue or save on a subscription * Issues delivered straight to your door or device From€8 View * * News * Reviews * Security * Websites * VPN * Insights * Resources * More TechRadar Huawei * Windows 11 pros & cons for business * Best hybrid working tech * Microsoft Teams updates * Latest Mobile news * Office 2021 TechRadar is supported by its audience. When you purchase through links on our site, we may earn an affiliate commission. Learn more 1. Home 2. News 3. Internet HACKERS HAVE INFILTRATED TOR BROWSER AND IT CAN'T GET RID OF THEM (YET) By Joel Khalili August 12, 2020 Tor Browser is working with limited resources due to recent layoffs * * * * * * (Image credit: Shutterstock / Daniel Constante) A mysterious group of hackers has attached hundreds of malicious servers to the network of privacy-focused web browser Tor, which are being used to execute targeted attacks on users. The Tor operators have been wrestling with the hackers since January, according to a report from independent security researcher Nusenu, who has monitored the network for a number of years. At the peak of the attack in May, the hackers operated a total of 380 Tor exit relays (the servers that bridge the network with the public internet), meaning each user had a roughly one in four chance of being funneled through a dangerous server. * Check out our list of the best antivirus services around * We've built a list of the best anonymous browsers right now * Here's our choice of the best malware removal software on the market Despite three separate attempts to rid the network of the malicious servers after alarms were raised by Tor directory authorities, the group still reportedly controls more than 10% of exit relays today. TOR BROWSER SECURITY Having gained a strong foothold in the Tor network - which is usually considered among the most secure around - the hackers have launched targeted attacks against users of cryptocurrency websites. “They perform person-in-the-middle attacks on Tor users by manipulating traffic as it flows through their exit relays,” wrote Nusenu. “They (selectively) remove HTPP-to-HTTPS redirects to gain full access to plain unencrypted HTTP traffic without causing TLS certificate warnings.” This type of attack is known as SSL stripping and allows malicious actors to capitalize on the fact users rarely type out full website URLs (including https://). In this context, the hackers are using the exploit to replace bitcoin addresses in unsecured HTTP traffic and funnel cryptocurrency payments into their own wallets. Tor Browser reportedly lacks the ability to verify new relay operators at sufficient scale, meaning there is no immediate resolution in sight. However, Nusenu claims to have contacted the cryptocurrency websites used to execute the hijacking attacks, which could choose to implement countermeasures (such as HSTS Preloading or HTTPS Everywhere). Update - August 12: Tor Browser has since provided TechRadar Pro with the following statement: "Last year we created a Network Health team to invest in a dedicated team just to keep track of [bad relays]. Unfortunately this year we had to lay off a third of our organization due to the fundraising impacts of Covid-19, which led us to reorganizing teams internally." "Due to the limited capacity we have at the moment, it takes a bit longer than usual to tackle certain things. Our goal is to recover our funds to be able to get that Network Health team back in shape." "We would like to take the opportunity to raise the importance for website admins to always enable HTTPS for their site (and that folks can get free certificates with Let's Encrypt) and to make sure they have HTTPS Everywhere enabled for their site, so their users can be redirected to a safer connection." The organization also explained it has a few ideas about how to address the issue, including an overhaul of the threat review process and new limits on the "influence" of unknown relays. This way, Tor can be certain that X% of the network can be trusted. * Here's our list of the best VPN services out there Joel Khalili * * * Staff Writer Joel Khalili is a Staff Writer working across both TechRadar Pro and ITProPortal. He's interested in receiving pitches around cybersecurity, data privacy, cloud, storage, internet infrastructure, mobile, 5G and blockchain. See more Internet news TechRadar newsletter Sign up to get breaking news, reviews, opinion, analysis and more, plus the hottest tech deals! Contact me with news and offers from other Future brands Receive email from us on behalf of our trusted partners or sponsors Thank you for signing up to TechRadar. You will receive a verification email shortly. There was a problem. Please refresh the page and try again. By submitting your information you agree to the Terms & Conditions and Privacy Policy and are aged 16 or over. FIND A PRODUCT LAPTOP TV HEADPHONES BLUETOOTH SPEAKERS SMARTPHONES CAMERA WEBCAM VPN MOST POPULAR MOST POPULARMOST SHARED 1. 1 LG OLED TVs will soon get rid of the Soap Opera effect for Amazon Prime movies 2. 2 7 new movies and TV shows on Netflix, Amazon Prime, HBO Max and more this weekend 3. 3 Best TV 2021: our top 10 smart TVs 4. 4 How to watch the Marvel movies in order 5. 5 Don't be me, wait for Black Friday for the new MacBook Pro deals instead 1. 1 GameStop PS5 restock: time, store locations, bundles, crowds – and when to get it next 2. 2 Alienware Aurora-desktop: vier het 25-jarig jubileum met Dell 3. 3 Toyota bZ4X is an electric car with a water-cooled battery and solar panel roof 4. 4 The best tools for hybrid working 5. 5 Parhaat kauhuelokuvat 2021: valitsimme piinaavimmat elokuvahetket iltaan Technology Magazines * ● * ● * ● Technology Magazines * The best tech tutorials and in-depth reviews From€8 View Technology Magazines * ● * ● * ● Technology Magazines * The best tech tutorials and in-depth reviews From£7.15 View Technology Magazines * ● * ● * ● Technology Magazines * The best tech tutorials and in-depth reviews FromUS$7.15 View TechRadar is part of Future US Inc, an international media group and leading digital publisher. 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