{"id":28386,"date":"2020-09-09T10:29:51","date_gmt":"2020-09-09T07:29:51","guid":{"rendered":"https:\/\/forklog.com\/en\/?p=28386"},"modified":"2025-08-27T11:24:54","modified_gmt":"2025-08-27T08:24:54","slug":"user-turns-200-into-250000-thanks-to-bug-in-defi-protocol-soft-yearn","status":"publish","type":"post","link":"https:\/\/u1f987.com\/en\/user-turns-200-into-250000-thanks-to-bug-in-defi-protocol-soft-yearn\/","title":{"rendered":"User turns $200 into $250,000 thanks to bug in DeFi protocol Soft Yearn"},"content":{"rendered":"<p>A bug in the DeFi protocol Soft Yearn (SYFI) allowed an anonymous user to turn the invested 0.5 ETH into 740 ETH.<!--more--><\/p>\n<blockquote class=\"twitter-tweet\">\n<p dir=\"ltr\" lang=\"en\">1\/ Take it as you will:<\/p>\n<p>I am the person who sold <a href=\"https:\/\/twitter.com\/search?q=%24SYFI&#038;src=ctag&#038;ref_src=twsrc%5Etfw\">$SYFI<\/a> on uniswap at the same time as the Rebase.<\/p>\n<p>Or, I am the person who exploited the rebase bug in <a href=\"https:\/\/twitter.com\/search?q=%24SYFI&#038;src=ctag&#038;ref_src=twsrc%5Etfw\">$SYFI<\/a>.<\/p>\n<p>Or, I am the malicious actor who pulled the rug on innocent chads.<\/p>\n<p>\u2014 Amplify (@A_mplify) <a href=\"https:\/\/twitter.com\/A_mplify\/status\/1302852245059330048?ref_src=twsrc%5Etfw\">September 7, 2020<\/a><\/p>\n<\/blockquote>\n<p><script async src=\"https:\/\/platform.twitter.com\/widgets.js\" charset=\"utf-8\"><\/script><\/p>\n<p>The SYFI token is designed to automatically adjust its circulating supply in line with the current price. The principle was originally used by the developers of the DeFi project Ampleforth.<\/p>\n<p>A user going by the handle Amplify said he exploited a data synchronization error between Soft Yearn and the Uniswap exchange. The trader sold two SYFI tokens at the old price, exhausting all available liquidity in the pool. With an initial investment of 0.5 ETH, he received 740 ETH.<\/p>\n<blockquote class=\"twitter-tweet\">\n<p dir=\"ltr\" lang=\"en\">12\/ Minutes before the Rebase I decided to buy back into <a href=\"https:\/\/twitter.com\/search?q=%24SYFI&#038;src=ctag&#038;ref_src=twsrc%5Etfw\">$SYFI<\/a> with my initial investment of .5ETH, I already made 1.5ETH. I had nothing to lose, right?<\/p>\n<p>\u2014 Amplify (@A_mplify) <a href=\"https:\/\/twitter.com\/A_mplify\/status\/1302852991263752192?ref_src=twsrc%5Etfw\">September 7, 2020<\/a><\/p>\n<\/blockquote>\n<p><script async src=\"https:\/\/platform.twitter.com\/widgets.js\" charset=\"utf-8\"><\/script><\/p>\n<p>Amplify stressed that there was no malicious intent or desire to harm anyone in his actions.<\/p>\n<blockquote>\n<p>\u201cI saw an opportunity, a deal, if you will, and I took it,\u201d he wrote.<\/p>\n<\/blockquote>\n<p>In total, the SYFI price collapsed from around $150 to near-zero levels in a day.<\/p>\n<div id=\"attachment_109618\" style=\"width: 1143px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-109618\" class=\"wp-image-109618 size-full\" src=\"https:\/\/u1f987.com\/wp-content\/uploads\/image1-287.png\" alt=\"\u041f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044c \u043f\u0440\u0435\u0432\u0440\u0430\u0442\u0438\u043b $200 \u0432 $250 000 \u0431\u043b\u0430\u0433\u043e\u0434\u0430\u0440\u044f \u043e\u0448\u0438\u0431\u043a\u0435 \u0432 DeFi-\u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u0435 Soft Yearn\" width=\"1133\" height=\"448\" srcset=\"https:\/\/u1f987.com\/wp-content\/uploads\/image1-287.png 1133w, https:\/\/u1f987.com\/wp-content\/uploads\/image1-287-300x119.png 300w, https:\/\/u1f987.com\/wp-content\/uploads\/image1-287-1024x405.png 1024w, https:\/\/u1f987.com\/wp-content\/uploads\/image1-287-768x304.png 768w\" sizes=\"auto, (max-width: 1133px) 100vw, 1133px\" \/><\/p>\n<p id=\"caption-attachment-109618\" class=\"wp-caption-text\">\u0418\u0441\u0442\u043e\u0447\u043d\u0438\u043a: <a href=\"https:\/\/www.coingecko.com\/ru\/\u041a\u0440\u0438\u043f\u0442\u043e\u0432\u0430\u043b\u044e\u0442\u044b\/soft-yearn\/usd#panel\" target=\"_blank\" rel=\"noopener noreferrer\">CoinGecko<\/a>.<\/p>\n<\/div>\n<p>In August, a bug <a href=\"https:\/\/u1f987.com\/en\/news\/unknown-bug-in-ethereum-clients-caused-synchronization-errors-for-13-of-nodes\">led<\/a> to the disabling of 13% of Parity-Ethereum and OpenEthereum nodes. Users were offered to revert to an earlier version of the software, switch to another client, or wait for a stable release.<\/p>\n<p>Subscribe to ForkLog\u2019s news on <a href=\"https:\/\/www.facebook.com\/forklog\" target=\"_blank\" rel=\"nofollow noopener noreferrer\">Facebook<\/a>!<\/p>\n","protected":false},"excerpt":{"rendered":"<p>A bug in the DeFi protocol Soft Yearn (SYFI) allowed an anonymous user to turn the invested 0.5 ETH into 740 ETH.<\/p>\n","protected":false},"author":1,"featured_media":28387,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"select":"1","news_style_id":"","cryptorium_level":"","_short_excerpt_text":"","creation_source":"","_metatest_mainpost_news_update":false,"footnotes":""},"categories":[3],"tags":[1301,1093],"class_list":["post-28386","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news-and-analysis","tag-blockchain-vulnerabilities","tag-defi"],"aioseo_notices":[],"amp_enabled":true,"views":"8","promo_type":"1","layout_type":"","short_excerpt":"","is_update":"","_links":{"self":[{"href":"https:\/\/u1f987.com\/en\/wp-json\/wp\/v2\/posts\/28386","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/u1f987.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/u1f987.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/u1f987.com\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/u1f987.com\/en\/wp-json\/wp\/v2\/comments?post=28386"}],"version-history":[{"count":1,"href":"https:\/\/u1f987.com\/en\/wp-json\/wp\/v2\/posts\/28386\/revisions"}],"predecessor-version":[{"id":28388,"href":"https:\/\/u1f987.com\/en\/wp-json\/wp\/v2\/posts\/28386\/revisions\/28388"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/u1f987.com\/en\/wp-json\/wp\/v2\/media\/28387"}],"wp:attachment":[{"href":"https:\/\/u1f987.com\/en\/wp-json\/wp\/v2\/media?parent=28386"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/u1f987.com\/en\/wp-json\/wp\/v2\/categories?post=28386"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/u1f987.com\/en\/wp-json\/wp\/v2\/tags?post=28386"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}