{"id":37095,"date":"2020-09-12T10:25:00","date_gmt":"2020-09-12T10:25:00","guid":{"rendered":"http:\/\/2a5119dd-46cc-4856-b614-442a629623f8"},"modified":"2020-09-12T10:25:00","modified_gmt":"2020-09-12T10:25:00","slug":"researcher-kept-a-major-bitcoin-bug-secret-for-two-years-to-prevent-attacks","status":"publish","type":"post","link":"https:\/\/www.threatshub.org\/blog\/researcher-kept-a-major-bitcoin-bug-secret-for-two-years-to-prevent-attacks\/","title":{"rendered":"Researcher kept a major Bitcoin bug secret for two years to prevent attacks"},"content":{"rendered":"<figure class=\"image image-original shortcode-image\"><span class=\"img aspect-set \"><img decoding=\"async\" src=\"https:\/\/zdnet3.cbsistatic.com\/hub\/i\/2020\/09\/12\/5d7eabd7-f35e-4bd6-8267-a3473504905d\/invdos-logo.png\" class alt=\"InvDos\"><\/span><figcaption><span class=\"caption\"><\/span><\/figcaption><\/figure>\n<p>In 2018, a security researcher discovered a major vulnerability in Bitcoin Core, the software that powers the Bitcoin blockchain, but after reporting the issue and having it patched, the researcher opted to keep details private in order to avoid hackers exploiting the issue.<\/p>\n<p>Technical details were published earlier this week after the same vulnerability was independently discovered in another cryptocurrency, based on an older version of the Bitcoin code that hadn&#8217;t received the patch.<\/p>\n<h2>Bitcoin Inventory Out-of-Memory Denial-of-Service Attack<\/h2>\n<p>Called&nbsp;<strong>INVDoS<\/strong>, the vulnerability is a classic denial-of-service (DoS) attack. While in many cases, DoS attacks are harmless, they are not for internet-reachable systems, which need to have stable uptime in order to process transactions.<\/p>\n<p>INVDoS was discovered in 2018 by&nbsp;<a href=\"https:\/\/github.com\/braydonf\" target=\"_blank\" rel=\"noopener noreferrer nofollow\" data-component=\"externalLink\">Braydon Fuller<\/a>, a Bitcoin protocol engineer. Fuller found that an attacker could create malformed Bitcoin transactions that, when processed by Bitcoin blockchain nodes, would lead to uncontrolled consumption of the server&#8217;s memory resources, which would eventually crash impacted systems.<\/p>\n<p>&#8220;At the time of the discovery, this represented more than 50% of publicly-advertised Bitcoin nodes with inbound traffic, and likely a majority of miners and exchanges,&#8221; Fuller said in a paper [<a href=\"https:\/\/invdos.net\/paper\/CVE-2018-17145.pdf\" target=\"_blank\" rel=\"noopener noreferrer nofollow\" data-component=\"externalLink\">PDF<\/a>] published on Wednesday.<\/p>\n<p>Furthermore, INVDoS also impacted more than Bitcoin nodes (servers) running the&nbsp;<strong>Bitcoin Core<\/strong>&nbsp;software. Bitcoin nodes running&nbsp;<strong>Bcoin<\/strong>&nbsp;and&nbsp;<strong>Btcd<\/strong>&nbsp;were also impacted by the same bug as well.<\/p>\n<p>Other cryptocurrencies that were built on the original Bitcoin protocol were also impacted, such as&nbsp;<strong>Litecoin<\/strong>&nbsp;and&nbsp;<strong>Namecoin<\/strong>.<\/p>\n<section class=\"sharethrough-top\" data-component=\"medusaContentRecommendation\" data-medusa-content-recommendation-options=\"{&quot;promo&quot;:&quot;promo_zd_recommendation_sharethrough_top_in_article_desktop&quot;,&quot;spot&quot;:&quot;dfp-in-article&quot;}\"> <\/section>\n<p>Fuller said the bug was dangerous because it could &#8220;<strong>contribute to a loss of funds or revenue<\/strong>.&#8221;<\/p>\n<p>&#8220;This could be through a loss of mining time or expenditure of electricity by shutting down nodes and delaying blocks or causing the network to temporarily partition,&#8221; he said.<\/p>\n<p>&#8220;It could also be through disruption and delay of time-sensitive contracts or prohibiting economic activity. That could affect commerce, exchanges, atomic swaps, escrows and lightning network HTLC payment channels,&#8221; Fuller added.<\/p>\n<h2>Bug re-discovered two years later<\/h2>\n<p>The INVDoS bug was reported to all the responsible parties and patched, at the time, under the generic identifier of&nbsp;<a href=\"https:\/\/nvd.nist.gov\/vuln\/detail\/CVE-2018-17145\" target=\"_blank\" rel=\"noopener noreferrer nofollow\" data-component=\"externalLink\">CVE-2018-17145<\/a>, which didn&#8217;t include that many details, so as not to tip off attackers.<\/p>\n<p>However, the same bug was re-discovered over the summer by&nbsp;<a href=\"https:\/\/twitter.com\/tuxcanfly\" target=\"_blank\" rel=\"noopener noreferrer\" data-component=\"externalLink\">Javed Khan<\/a>, another Bitcoin protocol engineer, while hunting bugs in the&nbsp;<strong>Decred&nbsp;<\/strong>cryptocurrency.<\/p>\n<p>Khan reported the bug to the Decred bug bounty program and was eventually disclosed to the broader world last month.<\/p>\n<p><a href=\"https:\/\/invdos.net\/\" target=\"_blank\" rel=\"noopener noreferrer nofollow\" data-component=\"externalLink\">Full details<\/a> about the entire INVDoS vulnerability were published earlier this week, so other cryptocurrencies that forked older versions of the Bitcoin protocols could check and see if they were impacted as well.<\/p>\n<p>&#8220;There has not been a known exploitation of this vulnerability in the wild,&#8221; Fuller and Khan said. &#8220;Not as far as we know.&#8221;<\/p>\n<p> READ MORE <a href=\"https:\/\/www.zdnet.com\/article\/researcher-kept-a-major-bitcoin-bug-secret-for-two-years-to-prevent-attacks\/#ftag=RSSbaffb68\">HERE<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>The INVDoS bug would have allowed attackers to crash Bitcoin nodes and other similar blockchains.<br \/>\nREAD MORE HERE&#8230;<\/p>\n","protected":false},"author":2,"featured_media":37096,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"colormag_page_layout":"default_layout","footnotes":""},"categories":[62],"tags":[],"class_list":["post-37095","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-zdnet-security"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Researcher kept a major Bitcoin bug secret for two years to prevent attacks 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 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