{"id":46333,"date":"2022-04-20T20:11:10","date_gmt":"2022-04-20T20:11:10","guid":{"rendered":"https:\/\/www.threatshub.org\/blog\/oracle-already-wins-crypto-bug-of-the-year-with-java-digital-signature-bypass\/"},"modified":"2022-04-20T20:11:10","modified_gmt":"2022-04-20T20:11:10","slug":"oracle-already-wins-crypto-bug-of-the-year-with-java-digital-signature-bypass","status":"publish","type":"post","link":"https:\/\/www.threatshub.org\/blog\/oracle-already-wins-crypto-bug-of-the-year-with-java-digital-signature-bypass\/","title":{"rendered":"Oracle already wins &#8216;crypto bug of the year&#8217; with Java digital signature bypass"},"content":{"rendered":"<p>Java versions 15 to 18 contain a flaw in its ECDSA signature validation that makes it trivial for miscreants to digitally sign files and other data as if they were legit organizations.<\/p>\n<p>Cyber-criminals could therefore pass off cryptographically signed malicious downloads and bogus information as if it were real, and affected Java applications and services won&#8217;t know the difference.<\/p>\n<p>The scope of the damage that could be done is wide: encrypted communications, authentication tokens, code updates, and more, built on Oracle&#8217;s flawed code could be subverted, and as far as vulnerable Java-written programs are concerned, the data looks legitimate and trustworthy.<\/p>\n<div aria-hidden=\"true\" class=\"adun\" data-pos=\"top\" data-raptor=\"condor\" data-xsm=\",fluid,mpu,\" data-sm=\",fluid,mpu,\" data-md=\",fluid,mpu,\"> <noscript> <a href=\"https:\/\/pubads.g.doubleclick.net\/gampad\/jump?co=1&amp;iu=\/6978\/reg_security\/front&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=2&amp;c=2YmX@73fyboVYEPLwK-XlHQAAAQI&amp;t=ct%3Dns%26unitnum%3D2%26raptor%3Dcondor%26pos%3Dtop%26test%3D0\" target=\"_blank\" rel=\"noopener\"> <img decoding=\"async\" src=\"https:\/\/pubads.g.doubleclick.net\/gampad\/ad?co=1&amp;iu=\/6978\/reg_security\/front&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=2&amp;c=2YmX@73fyboVYEPLwK-XlHQAAAQI&amp;t=ct%3Dns%26unitnum%3D2%26raptor%3Dcondor%26pos%3Dtop%26test%3D0\" alt> <\/a> <\/noscript> <\/div>\n<p>The blunder was <a href=\"https:\/\/www.oracle.com\/security-alerts\/cpuapr2022.html\" rel=\"nofollow\">patched<\/a> this month by Oracle \u2013 among more than 500 security fixes issued by the database giant this quarter \u2013 so, as always, update early and update often.<\/p>\n<div aria-hidden=\"true\" class=\"adun\" data-pos=\"top\" data-raptor=\"falcon\" data-xmd=\",fluid,mpu,leaderboard,\" data-lg=\",fluid,mpu,leaderboard,\" data-xlg=\",fluid,billboard,superleaderboard,mpu,leaderboard,\" data-xxlg=\",fluid,billboard,superleaderboard,brandwidth,brandimpact,leaderboard,mpu,\"> <noscript> <a href=\"https:\/\/pubads.g.doubleclick.net\/gampad\/jump?co=1&amp;iu=\/6978\/reg_security\/front&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=4&amp;c=44YmX@73fyboVYEPLwK-XlHQAAAQI&amp;t=ct%3Dns%26unitnum%3D4%26raptor%3Dfalcon%26pos%3Dmid%26test%3D0\" target=\"_blank\" rel=\"noopener\"> <img decoding=\"async\" src=\"https:\/\/pubads.g.doubleclick.net\/gampad\/ad?co=1&amp;iu=\/6978\/reg_security\/front&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=4&amp;c=44YmX@73fyboVYEPLwK-XlHQAAAQI&amp;t=ct%3Dns%26unitnum%3D426raptor%3Dfalcon%26pos%3Dmid%26test%3D0\" alt> <\/a> <\/noscript> <\/div>\n<div class=\"adun_eagle_desktop_story_wrapper\">\n<div aria-hidden=\"true\" class=\"adun\" data-pos=\"mid\" data-raptor=\"eagle\" data-xxlg=\",mpu,dmpu,\"> <noscript> <a href=\"https:\/\/pubads.g.doubleclick.net\/gampad\/jump?co=1&amp;iu=\/6978\/reg_security\/front&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=3&amp;c=33YmX@73fyboVYEPLwK-XlHQAAAQI&amp;t=ct%3Dns%26unitnum%3D3%26raptor%3Deagle%26pos%3Dmid%26test%3D0\" target=\"_blank\" rel=\"noopener\"> <img decoding=\"async\" src=\"https:\/\/pubads.g.doubleclick.net\/gampad\/ad?co=1&amp;iu=\/6978\/reg_security\/front&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=3&amp;c=33YmX@73fyboVYEPLwK-XlHQAAAQI&amp;t=ct%3Dns%26unitnum%3D3%26raptor%3Deagle%26pos%3Dmid%26test%3D0\" alt> <\/a> <\/noscript> <\/div>\n<\/p><\/div>\n<p>ECDSA stands for Elliptic Curve Digital Signature Algorithm. It uses elliptic curve cryptography, implementations of which <a href=\"https:\/\/www.theregister.com\/2014\/10\/15\/roll_your_own_bitcoin_client_prepare_to_be_raided\/\">have run<\/a> into a <a href=\"https:\/\/www.theregister.com\/2016\/03\/17\/mobile_money_transfer_crypto_cracked\/\">variety of issues<\/a> over the years.<\/p>\n<p>Although Oracle has only given this latest security weakness (<a href=\"https:\/\/nvd.nist.gov\/vuln\/detail\/CVE-2022-21449\" rel=\"nofollow\">CVE-2022-21449<\/a>) a severity rating of 7.5 out of 10, security consultancy ForgeRock \u2013 which said it became aware of, and privately disclosed, it in <a href=\"https:\/\/backstage.forgerock.com\/knowledge\/kb\/article\/a90257583\" rel=\"nofollow\">November<\/a> \u2013 rates the vulnerability a ten.<\/p>\n<div aria-hidden=\"true\" class=\"adun\" data-pos=\"top\" data-raptor=\"falcon\" data-xsm=\",fluid,mpu,\" data-sm=\",fluid,mpu,\" data-md=\",fluid,mpu,\"> <noscript> <a href=\"https:\/\/pubads.g.doubleclick.net\/gampad\/jump?co=1&amp;iu=\/6978\/reg_security\/front&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=4&amp;c=44YmX@73fyboVYEPLwK-XlHQAAAQI&amp;t=ct%3Dns%26unitnum%3D4%26raptor%3Dfalcon%26pos%3Dmid%26test%3D0\" target=\"_blank\" rel=\"noopener\"> <img decoding=\"async\" src=\"https:\/\/pubads.g.doubleclick.net\/gampad\/ad?co=1&amp;iu=\/6978\/reg_security\/front&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=4&amp;c=44YmX@73fyboVYEPLwK-XlHQAAAQI&amp;t=ct%3Dns%26unitnum%3D426raptor%3Dfalcon%26pos%3Dmid%26test%3D0\" alt> <\/a> <\/noscript> <\/div>\n<p>Infosec expert Thomas Ptacek already described it as &#8220;crypto bug of the year,&#8221; which we&#8217;re inclined to agree with.<\/p>\n<blockquote class=\"twitter-tweet\" readability=\"8.7372013651877\">\n<p lang=\"en\" dir=\"ltr\">Welp. It&#8217;s the crypto bug of the year. Mark it down for April. Java 15-18 ECDSA doesn&#8217;t sanity check that the random x coordinate and signature proof are nonzero; a (0,0) signature validates any message. Breaks JWT, SAML, &amp;c. <a href=\"https:\/\/t.co\/t2WgnS0g3A\">https:\/\/t.co\/t2WgnS0g3A<\/a><\/p>\n<p>\u2014 Thomas H. Ptacek (@tqbf) <a href=\"https:\/\/twitter.com\/tqbf\/status\/1516570590211153922?ref_src=twsrc%5Etfw\">April 20, 2022<\/a><\/p><\/blockquote>\n<p>What&#8217;s particularly interesting about this issue is that it&#8217;s incredibly easy to exploit, and an obvious programming error. The bug was introduced when part of Java 15&#8217;s signature-verification code was rewritten from its native C++ into Java itself \u2013 <a href=\"https:\/\/bugs.openjdk.java.net\/browse\/JDK-8237218\" rel=\"nofollow\">including<\/a> the ECDSA verification code.<\/p>\n<p>To simplify what happened, an ECDSA signature consists of a pair of numbers, referred to as <code>(r, s)<\/code>. To verify a signature, the code performs some math involving a hash (a fingerprint, if you will) of the data, the public key of whichever organization or person digitally signed the data, <code>r<\/code>, and <code>s<\/code>; one side of the equation uses <code>r<\/code>, the other <code>r<\/code> and <code>s<\/code>.<\/p>\n<p>Both sides of this computation must equal for the signature check to pass. That would mean the data was digitally signed by the signer&#8217;s private key, indicating the data originated from or is approved by the signer. If the signature check fails, that likely means whoever signed the data isn&#8217;t who they say they are (as they don&#8217;t have access to the secret, private key that corresponds to the given public key) and the data shouldn&#8217;t be trusted.<\/p>\n<p>In theory, for a signature to be valid, <code>(r, s)<\/code> cannot be <code>(0, 0)<\/code> because some of the math involves multiplying these numbers with other values. The bug arose because the original C++ code checked that both <code>r<\/code> and <code>s<\/code> are non-zero, and wouldn&#8217;t accept the signature if they were. The new Java code didn&#8217;t check, it just went ahead and computed with the values.<\/p>\n<p>You don&#8217;t need to know a lot of mathematics to know that anything multiplied by zero equals zero. One part of the calculation involves dividing by <code>s<\/code> \u2013 but, unfortunately, in a way that <em>doesn&#8217;t<\/em> generate an error if you divide by zero.<\/p>\n<p>The upshot is that in the affected versions of the code, anyone who presents a blank signature will be accepted. The normal verification pathway still works fine, which is why this wasn&#8217;t noticed two years ago. It just now accepts <code>(0,0)<\/code>, and successfully validates it.<\/p>\n<div aria-hidden=\"true\" class=\"adun\" id=\"story_eagle_xsm_sm_md_xmd_lg_xlg\" data-pos=\"mid\" data-raptor=\"eagle\" data-xsm=\",mpu,dmpu,\" data-sm=\",mpu,dmpu,\" data-md=\",mpu,dmpu,\" data-xmd=\",mpu,dmpu,\" data-lg=\",mpu,dmpu,\" data-xlg=\",mpu,dmpu,\"> <noscript> <a href=\"https:\/\/pubads.g.doubleclick.net\/gampad\/jump?co=1&amp;iu=\/6978\/reg_security\/front&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=3&amp;c=33YmX@73fyboVYEPLwK-XlHQAAAQI&amp;t=ct%3Dns%26unitnum%3D3%26raptor%3Deagle%26pos%3Dmid%26test%3D0\" target=\"_blank\" rel=\"noopener\"> <img decoding=\"async\" src=\"https:\/\/pubads.g.doubleclick.net\/gampad\/ad?co=1&amp;iu=\/6978\/reg_security\/front&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=3&amp;c=33YmX@73fyboVYEPLwK-XlHQAAAQI&amp;t=ct%3Dns%26unitnum%3D3%26raptor%3Deagle%26pos%3Dmid%26test%3D0\" alt> <\/a> <\/noscript> <\/div>\n<p>And this is on top of the gazillon remote-code execution flaws, with no authentication needed to exploit, in Oracle&#8217;s other products. \u00ae<\/p>\n<h3 class=\"crosshead\"> <span>Bootnote<\/span><br \/>\n<\/h3>\n<p>This flaw has been <a href=\"https:\/\/neilmadden.blog\/2022\/04\/19\/psychic-signatures-in-java\/\" rel=\"nofollow\">described<\/a> by ForgeRock&#8217;s Neil Madden as a <a href=\"https:\/\/tardis.fandom.com\/wiki\/Psychic_paper\" rel=\"nofollow\">psychic paper<\/a> vulnerability, after a plot device from a 2007 Doctor Who episode. Your humble bookish vulture thinks it sounds more like the imp card from A A Attanasio&#8217;s 1987 novel In Other Worlds:<\/p>\n<blockquote class=\"centredquote\" readability=\"9\">\n<p>You will receive a third and final artifact, an interfacing magnetic plate \u2013 an imp. It looks identical to a charge card, only it&#8217;s pure white. Insert it into any bank computer system and you will be credited with large sums of real capital.<\/p>\n<\/blockquote>\n<p> READ MORE <a href=\"https:\/\/go.theregister.com\/feed\/www.theregister.com\/2022\/04\/20\/java_authentication_bug\/\">HERE<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Whole new meaning for zero consequences Java versions 15 to 18 contain a flaw in its ECDSA signature validation that makes it trivial for miscreants to digitally sign files and other data as if they were legit organizations.\u2026 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":[63],"tags":[],"class_list":["post-46333","post","type-post","status-publish","format-standard","hentry","category-the-register"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - 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