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THIS NFT ON OPENSEA WILL STEAL YOUR IP ADDRESS


The NFT shows how viewers of NFTs on marketplaces like OpenSea may unexpectedly
expose their data.
by Joseph Cox
January 27, 2022, 2:00pm
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Image: Nick Bax

NFTs are usually passive affairs. A consumer buys the token, and then sells or
stores the NFT. The NFT doesn’t really do anything.

Some new NFTs are being used to harvest viewers’ IP addresses, though, in a
demonstration of how NFT marketplaces like OpenSea allow vendors, or attackers,
to load custom code when someone simply views an NFT listing.

“We've been researching a lot of problems in the NFT space (with more of a focus
on fraud) and one of the things we were playing around with was different XSS
attacks on websites that display NFTs which is when I realized we could get
OpenSea to load HTML pages,” Nick Bax, head of research at NFT organization
Convex Labs, told Motherboard in an online chat. XSS refers to cross site
scripting attacks, one of several different kinds of attack that someone could
use an NFT for.

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Bax and a team of engineers and contributors are working on multiple NFTs that
harvest peoples’ IP addresses. One, which includes a Simpsons and South Park
crossover image, surreptitiously collects the viewer’s IP address and stores it
in a panel for Bax to view later.

“I just right click + saved your IP address,” the description for the NFT on
OpenSea reads.

> Do you know about any other data gathering NFTs? We'd love to hear from you.
> Using a non-work phone or computer, you can contact Joseph Cox securely on
> Signal on +44 20 8133 5190, Wickr on josephcox, or email joseph.cox@vice.com.

Another NFT displays the viewer’s IP address back at them in the NFT itself
while viewing it on OpenSea. Motherboard verified this by loading the item’s
OpenSea listing; it correctly displayed the IP address of a VPN server used by
Motherboard.

“Total visitors logged: 85,” the NFT read at the time of writing.

Of course, websites often collect and store visitors’ IP addresses in virtue of
how the sites function. OpenSea itself likely collects the IP addresses of
visitors, like plenty of other sites, apps, or services. But here, an outside
third party—the NFT seller—is able to gather information themselves on the
people viewing the NFT, potentially without them knowing.



Armed with an IP address, an attacker can first work out a viewer’s coarse
location, usually at least down to what city they are connecting from. Attackers
can then also use that information to try and dig up other details, such as
potentially their real name or physical address if that data has been stored
elsewhere or included in a previous breach from another site.

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The issue is that OpenSea lets NFT sellers add an “animation_url” to the NFT’s
metadata, Bax explained in a tweet. That animation_url supports HTML files, he
added. The HTML file in this data-grabbing NFT includes a commonly-used IP
harvesting bit of code from a site called IPlogger.org, he added.

Last week, Alex Lupascu, co-founder of privacy and blockchain company Omnia,
described how his team discovered that popular cryptocurrency wallet MetaMask
had an issue where an attacker could mint an NFT and then send it to a victim to
obtain their IP address. In that demonstration, the token directed the user’s
wallet to a server that grabbed the image to display in their wallet,. Because
NFTs usually only contain a URL pointing to a server that holds the actual
image, rather than the image itself, Lupascu devised a setup where an attacker
controls this server and harvests the user's IP address when the wallet fetched
the image. According to Lupascu, this could in theory be used to launch a
distributed denial of service attack that overloads a specific URL with traffic.

MetaMask founder Daniel Finlay later said they were starting work to fix the
issue raised by Lupascu.

For OpenSea and these new NFTs, Bax said in a tweet that he doesn’t consider
OpenSea allowing this sort of activity to be a vulnerability in OpenSea himself,
so he didn’t contact the company to disclose the issue OpenSea did not respond
to Motherboard’s request for comment.

Subscribe to our cybersecurity podcast, CYBER. Subscribe to our new Twitch
channel.

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   MAJOR NFT MARKETPLACE OPENSEA ADMITS EMPLOYEE DID INSIDER TRADING
   
   An OpenSea employee bought NFTs before they were promoted on the
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   PEOPLE BUILDING ‘BLOCKCHAIN CITY’ IN WYOMING SCAMMED BY HACKERS
   
   The attack was the latest done over Discord and is a growing concern for the
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   PEOPLE CAN’T SEE SOME NFTS ON TWITTER, CRYPTO WALLETS AFTER OPENSEA GOES DOWN
   
   A Thursday outage interfered with the ability of MetaMask, which depends on
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