二要素認証はもはや安全ではない、GmailやOutlookなどEメールに関する新たな警告

<!DOCTYPE html><html lang=ja><head prefix="og: http://ogp.me/ns# fb: http://ogp.me/ns/fb# website: http://ogp.me/ns/website#"><meta charset=UTF-8> <meta content="width=device-width, initial-scale=1.0" name=viewport><meta content="IE=edge" http-equiv=X-UA-Compatible><meta content=max-image-preview:large name=robots><meta content="telephone=no" name=format-detection><link href=https://static.forbesjapan.com/asset/favicon.ico rel="shortcut icon"><link href=https://forbesjapan.com/articles/detail/77188 rel=canonical><title>二要素認証はもはや安全ではない、GmailやOutlookなどEメールに関する新たな警告 | Forbes JAPAN 公式サイト（フォーブスジャパン）</title><meta content="二要素認証はもはや安全ではない、GmailやOutlookなどEメールに関する新たな警告 | Forbes JAPAN 公式サイト（フォーブスジャパン）" property=og:title><meta content=website property=og:type><meta content=https://images.forbesjapan.com/media/article/77188/images/main_image_3e7deeef3aaafdc3ebc3f837e97a0203c5c3fe80.jpg property=og:image><meta content=https://forbesjapan.com/articles/detail/77188 property=og:url><meta content=GmailやOutlook、さらにAOLやYahooなどの主要なメールプラットフォームには、毎日何十億ものユーザーがログインしているが、新たに危険な攻撃が確認されている。もし2FA（二要素認証）が常に安全だと考えているなら、今一度考え直す必... property=og:description><meta content=1132003217202372 property=fb:app_id><meta content=summary_large_image name=twitter:card><meta content=GmailやOutlook、さらにAOLやYahooなどの主要なメールプラットフォームには、毎日何十億ものユーザーがログインしているが、新たに危険な攻撃が確認されている。もし2FA（二要素認証）が常に安全だと考えているなら、今一度考え直す必... name=description><link href=/manifest.json rel=manifest><link href=//fonts.googleapis.com rel=dns-prefetch><link href=//fonts.gstatic.com rel=dns-prefetch><link href=//www.googletagmanager.com rel=dns-prefetch><link href=https://static.forbesjapan.com rel=dns-prefetch><link href=https://images.forbesjapan.com rel=dns-prefetch><link crossorigin="" href=//fonts.gstatic.com rel=preconnect><link href=//www.googletagmanager.com rel=preconnect><link as=script href=https://securepubads.g.doubleclick.net/tag/js/gpt.js rel=prefetch><link as=style href=https://static.forbesjapan.com/asset/frontend/dist/style-standard-common.bundle.css rel=prefetch><link as=style href=https://static.forbesjapan.com/asset/frontend/dist/style-standard-desktop.bundle.css rel=prefetch><link as=style href=https://static.forbesjapan.com/asset/frontend/dist/style-standard-smartphone.bundle.css rel=prefetch><link as=script href="https://www.googletagmanager.com/gtag/js?id=UA-23399050-3" rel=prefetch><link as=script href=https://static.forbesjapan.com/asset/frontend/dist/parts-standard.bundle.js rel=prefetch><link href=https://fonts.googleapis.com rel=preconnect><link crossorigin="" href=https://fonts.gstatic.com rel=preconnect><link as=style href="https://fonts.googleapis.com/css?family=Lato:700,900&display=swap" media=print onload="this.media='all'" rel=stylesheet><link as=style href="https://fonts.googleapis.com/css2?family=Roboto+Condensed:wght@400;700&display=swap" media=print onload="this.media='all'" rel=stylesheet><link href="https://fonts.googleapis.com/css2?family=Noto+Sans+JP:wght@100..900&display=swap" rel=stylesheet><link as=style href=https://static.forbesjapan.com/asset/frontend/dist/style-standard-common.bundle.css?20250401191304 rel=stylesheet><link as=style href=https://static.forbesjapan.com/asset/frontend/dist/style-standard-desktop.bundle.css?20250401191304 media="print and (max-width:768px), screen and (min-width:769px)" onload="this.media='screen and (min-width:769px)';" rel=stylesheet><link as=style href=https://static.forbesjapan.com/asset/frontend/dist/style-standard-smartphone.bundle.css?20250401191304 media="print and (min-width:769px), screen and (max-width:768px)" onload="this.media='screen and (max-width:768px)';" rel=stylesheet><script>(function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start': new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0], j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src= 'https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f); })(window,document,'script','dataLayer','GTM-K2BZS4J');</script><script async src="https://www.googletagmanager.com/gtag/js?id=UA-23399050-3"></script><script>window.dataLayer = window.dataLayer || []; function gtag(){dataLayer.push(arguments);} gtag('js', new Date()); gtag('set', { 'content_group1': '', 'content_group2': 'テクノロジー', 'content_group3': 'Zak Doffman', 'content_group4': '翻訳記事', 'content_group5': '安井克至'}); gtag('config', 'UA-23399050-3');</script><script type=text/javascript>var googletag = googletag || {}; googletag.cmd = googletag.cmd || []; (function() { var gads = document.createElement('script'); gads.async = true; gads.type = 'text/javascript'; var useSSL = 'https:' == document.location.protocol; gads.src = (useSSL ? 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lines = [ { divId: 'dipalyId-67ec026612890', gpt: { unitCode: '/122817434/Forbes_PC_300x250_inline', sizes: [ [300, 250], [300, 170] ] } } ]; window.fluxtag.renderAds(lines, window.fluxtag.failSafeTimeout); })(); }</script> </div></div> </div> <div class="article-detail-txt detail"><div class=article-content77188> GmailやOutlook、さらにAOLやYahooなどの主要なメールプラットフォームには、毎日何十億ものユーザーがログインしているが、新たに危険な攻撃が確認されている。もし2FA（二要素認証）が常に安全だと考えているなら、今一度考え直す必要がある。<br class=paragraph><br>この攻撃は「セッションハイジャックとリアルタイムでの認証情報傍受を通じて2FAを回避する」というものであり、以下に説明するような避けるべき危険なサインインページが存在する。<br><br>この警告を発しているのは、SlashNextという企業で、同社が<a href=https://slashnext.com/blog/astaroth-a-new-2fa-phishing-kit-targeting-gmail-yahoo-aol-o365-and-3rd-party-logins/ rel=noopener target=_blank>公表したレポート</a>（危険な画面イメージ例付き）によると、新たなフィッシングキットAstarothが問題となっている。感染したデバイス上で、このキットはユーザーと正規のアカウントサインインページとの間にMITM（マン・イン・ザ＿ミドル）攻撃を仕かけ、「ログイン資格情報、トークン、セッションCookieをリアルタイムで取得し、事実上2FAを回避する」という。<br><br>このAstarothは1月に初めて報告され、「ログイン資格情報だけでなく、2FA認証トークンやセッションCookieを生成と同時に高速で傍受する点」に特徴がある。特に危険なのは、「リバースプロキシ機能を利用したリアルタイム傍受によって、驚くほどすばやく正確に2FA防御を突破する」という点である。<br class=paragraph><div class="inRead2 sp-none"><div class="ad-pc ad77188 adFrame1310 inReadAd"><div id=dipalyId-67ec026612ead style="text-align: center;"><script>if (window.innerWidth > 768) { (function() { var lines = [ { divId: 'dipalyId-67ec026612ead', gpt: { unitCode: '/122817434/PC_Teads_1x1', sizes: [ [1, 1] ] } } ]; window.fluxtag.renderAds(lines, window.fluxtag.failSafeTimeout); })(); }</script> </div></div></div><br>SlashNextは次のように警告している。「従来のフィッシングキットは、静的な偽ログインページで主に一次的な認証情報を盗むだけで、2FAの層には手がおよばなかった。しかしAstarothはリアルタイムであらゆる認証データを傍受し、従来型のフィッシング手口やそれに対応するセキュリティ対策をほぼ無力化してしまう」 </div> </div><div class=article-detail-btn-wrap><div 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二要素認証はもはや安全ではない、GmailやOutlookなどEメールに関する新たな警告 | Forbes JAPAN 公式サイト（フォーブス ジャパン）

二要素認証はもはや安全ではない、GmailやOutlookなどEメールに関する新たな警告 | Forbes JAPAN 公式サイト（フォーブスジャパン）