{"id":67348,"date":"2022-09-19T12:30:18","date_gmt":"2022-09-19T09:30:18","guid":{"rendered":"https:\/\/forklog.com\/en\/?p=67348"},"modified":"2025-09-07T06:09:37","modified_gmt":"2025-09-07T03:09:37","slug":"analysts-identify-replay-attack-on-ethereum-pow-fork-tokens","status":"publish","type":"post","link":"https:\/\/u1f987.com\/en\/analysts-identify-replay-attack-on-ethereum-pow-fork-tokens\/","title":{"rendered":"Analysts identify replay attack on Ethereum PoW fork tokens"},"content":{"rendered":"<p>Security researchers at BlockSec have discovered an exploit linked to the Ethereum PoW fork (ETHW).<\/p>\n<blockquote class=\"twitter-tweet\">\n<p lang=\"en\" dir=\"ltr\">1\/ Alert | BlockSec detected that exploiters are replaying the message (calldata) of the PoS chain on <a href=\"https:\/\/twitter.com\/EthereumPow?ref_src=twsrc%5Etfw\">@EthereumPow<\/a>. The root cause of the exploitation is that the bridge doesn&#8217;t correctly verify the actual chainid (which is maintained by itself) of the cross-chain message.<\/p>\n<p>\u2014 BlockSec (@BlockSecTeam) <a href=\"https:\/\/twitter.com\/BlockSecTeam\/status\/1571433997460459521?ref_src=twsrc%5Etfw\">September 18, 2022<\/a><\/p><\/blockquote>\n<p> <script async src=\"https:\/\/platform.twitter.com\/widgets.js\" charset=\"utf-8\"><\/script><\/p>\n<p>According to BlockSec, the OmniBridge contract for Gnosis Chain incorrectly verified the chainID parameter. As a result, attackers could obtain an additional 200 ETHW by sending a similar amount in WETH.<\/p>\n<p>The developers of the PoW fork <a href=\"https:\/\/medium.com\/@ETHW\/ethw-core-has-confirmed-that-a-contract-vulnerability-attack-against-a-bridge-is-not-a-replay-40bb797f9408\">emphasized<\/a> that the issue lies in the contract, not in the new blockchain. According to them, the team &#8220;has contacted OmniBridge and informed them of the risks&#8221;.<\/p>\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>\u201cETHW has independently ensured compliance with <a href=\"https:\/\/eips.ethereum.org\/EIPS\/eip-155\">EIP-155<\/a>, and the replay attack against ETHPoS and on ETHPoS, which ETHW Core security engineers had planned in advance, did not occur,\u201d the developers clarified.<\/p>\n<\/blockquote>\n<p>As reported on September 15 at 9:42 (Kyiv\/MSK), the Ethereum mainnet <a href=\"https:\/\/u1f987.com\/en\/news\/ethereum-activates-the-merge-blockchain-shifts-to-pos\">activated<\/a> The Merge upgrade. The blockchain has successfully transitioned to the Proof-of-Stake consensus algorithm.<\/p>\n<p><a href=\"https:\/\/u1f987.com\/en\/news\/ethereum-pow-fork-developers-reveal-mainnet-launch-details\">announced<\/a> the launch of the mainnet within 24 hours of the upgrade. A few hours after the upgrade was activated, the team published the network identifiers.<\/p>\n<p>Follow ForkLog&#8217;s Bitcoin news on our <a href=\"https:\/\/telegram.me\/forklog\" target=\"_blank\" rel=\"nofollow noopener\">Telegram<\/a> \u2014 cryptocurrency news, prices and analysis.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Security researchers at BlockSec have discovered an exploit related to the Ethereum PoW fork (ETHW).<\/p>\n","protected":false},"author":1,"featured_media":67349,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"select":"1","news_style_id":"1","cryptorium_level":"","_short_excerpt_text":"","creation_source":"","_metatest_mainpost_news_update":false,"footnotes":""},"categories":[3],"tags":[46,268],"class_list":["post-67348","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news-and-analysis","tag-ethereum","tag-hardfork"],"aioseo_notices":[],"amp_enabled":true,"views":"28","promo_type":"1","layout_type":"1","short_excerpt":"","is_update":"","_links":{"self":[{"href":"https:\/\/u1f987.com\/en\/wp-json\/wp\/v2\/posts\/67348","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=67348"}],"version-history":[{"count":1,"href":"https:\/\/u1f987.com\/en\/wp-json\/wp\/v2\/posts\/67348\/revisions"}],"predecessor-version":[{"id":67350,"href":"https:\/\/u1f987.com\/en\/wp-json\/wp\/v2\/posts\/67348\/revisions\/67350"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/u1f987.com\/en\/wp-json\/wp\/v2\/media\/67349"}],"wp:attachment":[{"href":"https:\/\/u1f987.com\/en\/wp-json\/wp\/v2\/media?parent=67348"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/u1f987.com\/en\/wp-json\/wp\/v2\/categories?post=67348"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/u1f987.com\/en\/wp-json\/wp\/v2\/tags?post=67348"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}