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 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









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