{"id":45000,"date":"2022-01-26T21:26:13","date_gmt":"2022-01-26T21:26:13","guid":{"rendered":"https:\/\/www.threatshub.org\/blog\/alert-lets-encrypt-to-revoke-about-2-million-https-certificates-in-two-days\/"},"modified":"2022-01-26T21:26:13","modified_gmt":"2022-01-26T21:26:13","slug":"alert-lets-encrypt-to-revoke-about-2-million-https-certificates-in-two-days","status":"publish","type":"post","link":"https:\/\/www.threatshub.org\/blog\/alert-lets-encrypt-to-revoke-about-2-million-https-certificates-in-two-days\/","title":{"rendered":"Alert: Let&#8217;s Encrypt to revoke about 2 million HTTPS certificates in two days"},"content":{"rendered":"<p>Let&#8217;s Encrypt, a non-profit organization that helps people obtain free SSL\/TLS certificates for websites, plans to revoke a non-trivial number of its certs on Friday because they were improperly issued.<\/p>\n<p>In <a href=\"https:\/\/community.letsencrypt.org\/t\/2022-01-25-issue-with-tls-alpn-01-validation-method\/170450\" rel=\"nofollow\">a post<\/a> to the Let&#8217;s Encrypt discussion community forum, site reliability engineer Jillian Tessa explained that on Tuesday, a third party reported &#8220;two irregularities&#8221; in the code implementing the &#8220;TLS Using ALPN&#8221; validation method (BRs 3.2.2.4.20, RFC 8737) in Boulder, its Automatic Certificate Management Environment (ACME) software.<\/p>\n<p>&#8220;All active certificates that were issued and validated with the TLS-ALPN-01 challenge before 0048 UTC on 26 January 2022 when our fix was deployed are considered mis-issued,&#8221; explained Tessa. &#8220;In compliance with the Let&#8217;s Encrypt CP [Certificate Policy], we have 5-days to revoke and will begin to revoke certificates at 1600 UTC on 28 January 2022.&#8221;&nbsp;<\/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=2YfHCXlFJHdQolPLZWYcIEgAAAMM&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=2YfHCXlFJHdQolPLZWYcIEgAAAMM&amp;t=ct%3Dns%26unitnum%3D2%26raptor%3Dcondor%26pos%3Dtop%26test%3D0\" alt> <\/a> <\/noscript> <\/div>\n<p>Let&#8217;s Encrypt estimates that less than one per cent of active certificates are affected; this is still a large number \u2013 about two million, according to a spokesperson \u2013 given that there are currently about <a href=\"https:\/\/letsencrypt.org\/stats\/\" rel=\"nofollow\">221 million<\/a> active Let&#8217;s Encrypt-issued certificates.<\/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=44YfHCXlFJHdQolPLZWYcIEgAAAMM&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=44YfHCXlFJHdQolPLZWYcIEgAAAMM&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=33YfHCXlFJHdQolPLZWYcIEgAAAMM&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=33YfHCXlFJHdQolPLZWYcIEgAAAMM&amp;t=ct%3Dns%26unitnum%3D3%26raptor%3Deagle%26pos%3Dmid%26test%3D0\" alt> <\/a> <\/noscript> <\/div>\n<\/p><\/div>\n<p>Affected certificate holders will be notified of the revocation by email, at which point <a href=\"https:\/\/community.letsencrypt.org\/t\/questions-about-renewing-before-tls-alpn-01-revocations\/170449\" rel=\"nofollow\">certificate renewal<\/a> will be necessary.<\/p>\n<p>This is not the remediation of an exploit. &#8220;The update to the TLS-ALPN-01 challenge type was made to be in compliance with the Baseline Requirements, which requires use of TLS 1.2 or higher,&#8221; a spokesperson for Let&#8217;s Encrypt told <em>The Register<\/em> in an email.<\/p>\n<p>When you get a certificate from Let&#8217;s Encrypt, the organization&#8217;s servers attempt to validate that you have control over the relevant resources by presenting a challenge, per the ACME standard. This challenge may be conducted using HTTP, DNS, or TLS, depending upon what works or doesn&#8217;t work with the client setup. It&#8217;s similar in concept to sending an email verification link that must be clicked to complete the setup of an online account.&nbsp;<\/p>\n<p>The TLS-ALPN-01 challenge is available for those unable or unwilling to use port 80 for an HTTP-01 challenge. According to Let&#8217;s Encrypt, &#8220;It is best suited to authors of TLS-terminating reverse proxies that want to perform host-based validation like HTTP-01, but want to do it entirely at the TLS layer in order to separate concerns.&#8221;<\/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=44YfHCXlFJHdQolPLZWYcIEgAAAMM&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=44YfHCXlFJHdQolPLZWYcIEgAAAMM&amp;t=ct%3Dns%26unitnum%3D426raptor%3Dfalcon%26pos%3Dmid%26test%3D0\" alt> <\/a> <\/noscript> <\/div>\n<p>Let&#8217;s Encrypt developer Aaron Gable said in a separate <a href=\"https:\/\/community.letsencrypt.org\/t\/changes-to-tls-alpn-01-challenge-validation\/170427\" rel=\"nofollow\">post<\/a> that two changes were made to the organization&#8217;s verification code affecting client applications that specifically use TLS-ALPN-01. First, the software now <a href=\"https:\/\/github.com\/letsencrypt\/boulder\/pull\/5905\" rel=\"nofollow\">enforces network negotiation using TLS 1.2 or higher<\/a>. Previously the code allowed connections over TLS 1.1, which is now considered to be <a href=\"https:\/\/docs.microsoft.com\/en-us\/lifecycle\/announcements\/transport-layer-security-1x-disablement\" rel=\"nofollow\">insecure<\/a>.<\/p>\n<p>Second, the software no longer supports the legacy OID (Object Identifier) 1.3.6.1.5.5.7.1.30.1, which served to identify the &#8220;acmeIdentifier&#8221; extension in early versions of <a href=\"https:\/\/datatracker.ietf.org\/doc\/html\/rfc8737\" rel=\"nofollow\">RFC 8737<\/a>. The Let&#8217;s Encrypt software now only accepts the standardized OID 1.3.6.1.5.5.7.1.31.<\/p>\n<p>Certificate verification attempts using TLS 1.1 or the discontinued OID will fail under the revised software; those certificates verified via TLS-ALPN-01 under the old code fail to comply with <a href=\"https:\/\/letsencrypt.org\/repository\/\" rel=\"nofollow\">Let&#8217;s Encrypt policy<\/a> and thus need to be reissued. \u00ae<\/p>\n<p> READ MORE <a href=\"https:\/\/go.theregister.com\/feed\/www.theregister.com\/2022\/01\/26\/lets_encrypt_certificates\/\">HERE<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Relatively small number of certs issued using a verification method that doesn&#8217;t comply with policy Let&#8217;s Encrypt, a non-profit organization that helps people obtain free SSL\/TLS certificates for websites, plans to revoke a non-trivial number of its certs on Friday because they were improperly issued.\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-45000","post","type-post","status-publish","format-standard","hentry","category-the-register"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Alert: Let&#039;s Encrypt to revoke about 2 million HTTPS certificates in two days 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 rel=\"canonical\" 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