{"id":43388,"date":"2021-10-13T14:39:26","date_gmt":"2021-10-13T14:39:26","guid":{"rendered":"https:\/\/packetstormsecurity.com\/news\/view\/32719\/OpenSea-Had-Bugs-Allowing-Malicious-NFT-Uploads.html"},"modified":"2021-10-13T14:39:26","modified_gmt":"2021-10-13T14:39:26","slug":"opensea-had-bugs-allowing-malicious-nft-uploads","status":"publish","type":"post","link":"https:\/\/www.threatshub.org\/blog\/opensea-had-bugs-allowing-malicious-nft-uploads\/","title":{"rendered":"OpenSea Had Bugs Allowing Malicious NFT Uploads"},"content":{"rendered":"<div><img decoding=\"async\" src=\"https:\/\/www.zdnet.com\/a\/img\/resize\/3ddb8b4708638634afc93a5572b264ad6121d1f9\/2021\/10\/12\/f1ec013f-bf75-4d91-a398-765065de6a38\/screenshot-2021-10-12-at-18-23-21.png?width=770&amp;height=578&amp;fit=crop&amp;auto=webp\" class=\"ff-og-image-inserted\"><\/div>\n<p>Critical security issues in the OpenSea NFT marketplace that allowed attackers to steal cryptocurrency wallet funds have been patched.&nbsp;<\/p>\n<p><a href=\"https:\/\/www.zdnet.com\/article\/are-nft-collectibles-the-new-trading-cards-or-a-hype-bubble-soon-to-burst\/\" target=\"_blank\" rel=\"noopener\">NFT<\/a>s, also known as non-fungible tokens, are digital assets that can be sold and traded on the blockchain. While some NFTs &#8212; from a pixel cartoon to a popular meme &#8212; can reach a sale price of <a href=\"https:\/\/www.bbc.co.uk\/news\/technology-56371912\" target=\"_blank\" rel=\"noopener noreferrer nofollow\" data-component=\"externalLink\">millions of dollars<\/a>, the popularity of this phenomenon has also created a new attack vector for exploitation. &nbsp;<\/p>\n<p>On Wednesday, the Check Point Research (CPR) <a href=\"https:\/\/blog.checkpoint.com\/\" target=\"_blank\" rel=\"noopener noreferrer nofollow\" data-component=\"externalLink\">team said<\/a> that flaws in the OpenSea NFT marketplace could have allowed &#8220;hackers to hijack user accounts and steal entire crypto wallets of users, by sending malicious NFTs.&#8221; <\/p>\n<p>An investigation was launched after <a href=\"https:\/\/www.bleepingcomputer.com\/news\/security\/fake-opensea-support-staff-are-stealing-cryptowallets-and-nfts\/\" target=\"_blank\" rel=\"noopener noreferrer nofollow\" data-component=\"externalLink\">reports surfaced<\/a> of malicious NFTs, airdropped for free, being used as conduits for cryptocurrency theft and account hijacking.&nbsp; <\/p>\n<p>The NFT itself, and the airdrop, was not the source of the issue. Instead, once an NFT had been gifted to a potential victim, they would view it &#8212; and then a pop-up would trigger, requesting a signature to connect to a wallet. A secondary signature request prompt would then appear, and if accepted, could grant attackers access to an unwitting user&#8217;s wallet, funds, and more.&nbsp; <\/p>\n<p>In OpenSea&#8217;s case, the security flaw allowed the team to upload an .SVG file containing a malicious payload, which would execute under the OpenSea storage subdomain. <\/p>\n<p>&#8220;In our attack scenario, the user is asked to sign with their wallet after clicking an image received from a third party, which is unexpected behavior on OpenSea, since it does not correlate to services provided by the OpenSea platform, like buying an item, making an offer, or favoring an item,&#8221; CPR says. &#8220;However, since the transaction operation domain is from OpenSea itself, and since this is an action the victim usually gets in other NFT operations, it may lead them to approve the connection.&#8221;<\/p>\n<section class=\"sharethrough-top placeholder\"> <\/section>\n<p>The researchers disclosed their findings to OpenSea on September 26. Within less than an hour, the marketplace had triaged and verified the security issues and deployed a fix.&nbsp; <\/p>\n<p>In a statement, OpenSea said: <\/p>\n<blockquote readability=\"10\">\n<p>&#8220;Security is fundamental to OpenSea. We appreciate the CPR team bringing this vulnerability to our attention and collaborating with us as we investigated the matter and implemented a fix within an hour of it being brought to our attention.&nbsp; <\/p>\n<p>These attacks would have relied on users approving malicious activity through a third-party wallet provider by connecting their wallet and providing a signature for the malicious transaction.&#8221; <\/p>\n<\/blockquote>\n<p>OpenSea added that the organization has not found any evidence of exploitation in the wild. <\/p>\n<h3> Previous and related coverage <\/h3>\n<hr>\n<p><strong>Have a tip?<\/strong> Get in touch securely via WhatsApp | Signal at +447713 025 499, or over at Keybase: charlie0<\/p>\n<hr>\n<p> READ MORE <a href=\"https:\/\/packetstormsecurity.com\/news\/view\/32719\/OpenSea-Had-Bugs-Allowing-Malicious-NFT-Uploads.html\">HERE<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>READ MORE HERE&#8230;<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"colormag_page_layout":"default_layout","footnotes":""},"categories":[277],"tags":[256],"class_list":["post-43388","post","type-post","status-publish","format-standard","hentry","category-cybersecurity-blogs","tag-headlinehackerflaw"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>OpenSea Had Bugs Allowing Malicious NFT Uploads 2026 | ThreatsHub Cybersecurity News<\/title>\n<meta name=\"description\" content=\"ThreatsHub Cybersecurity News | ThreatsHub.org | Cloud Security &amp; Cyber Threats Analysis Hub. 100% Free OSINT Threat Intelligent and Cybersecurity News.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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