{"id":35207,"date":"2020-05-27T16:17:39","date_gmt":"2020-05-27T16:17:39","guid":{"rendered":"https:\/\/packetstormsecurity.com\/news\/view\/31244\/OpenSSH-To-Deprecate-SHA-1-Logins-Due-To-Security-Risk.html"},"modified":"2020-05-27T16:17:39","modified_gmt":"2020-05-27T16:17:39","slug":"openssh-to-deprecate-sha-1-logins-due-to-security-risk","status":"publish","type":"post","link":"https:\/\/www.threatshub.org\/blog\/openssh-to-deprecate-sha-1-logins-due-to-security-risk\/","title":{"rendered":"OpenSSH To Deprecate SHA-1 Logins Due To Security Risk"},"content":{"rendered":"<p><span class=\"img aspect-set\"><img decoding=\"async\" src=\"https:\/\/zdnet1.cbsistatic.com\/hub\/i\/2020\/02\/14\/c584fae7-68d7-49f9-8e85-6f0e46fd8aca\/openssh.png\" class alt=\"OpenSSH SSH\"><\/span><\/p>\n<p>OpenSSH, the most popular utility for connecting to and managing remote servers, has announced today plans to drop support for its SHA-1 authentication scheme.<\/p>\n<p>The OpenSSH team cited security concerns with the SHA-1 hashing algorithm, currently considered insecure.<\/p>\n<p>The algorithm was broken in a practical, real-world attack in February 2017, when Google cryptographers disclosed <a href=\"https:\/\/shattered.it\/\" target=\"_blank\" rel=\"noopener noreferrer nofollow\" data-component=\"externalLink\">SHAttered<\/a>, a technique that could make two different files appear as they had the same SHA-1 file signature.<\/p>\n<p>At the time, creating an SHA-1 collision was considered computationally expensive, and Google experts thought SHA-1 could still be used in practice for at least half a decade until the cost would go down.<\/p>\n<p>However, subsequent research released in May 2019 and in January 2020, detailed an updated methodology to cut down the cost of an SHA-1 chosen-prefix collision attack to <a href=\"https:\/\/www.zdnet.com\/article\/sha-1-collision-attacks-are-now-actually-practical-and-a-looming-danger\/\" target=\"_blank\" rel=\"noopener noreferrer\">under $110,000<\/a> and <a href=\"https:\/\/eprint.iacr.org\/2020\/014.pdf\" target=\"_blank\" rel=\"noopener noreferrer nofollow\" data-component=\"externalLink\">under $50,000<\/a>, respectively.<\/p>\n<p>For advanced threat actors, such as nation-state and high-end cybercrime groups, $50,000 is a small price to pay if they could generate an SSH authentication key that grants them remote and undetected access to critical servers.<\/p>\n<h3>OpenSSH to disable &#8220;ssh-rsa&#8221; mode<br \/><\/h3>\n<p>&#8220;For this reason, we will be disabling the &#8216;ssh-rsa&#8217; public key signature algorithm by default in a near-future release,&#8221; OpenSSH developers said today.<\/p>\n<section class=\"sharethrough-top\" data-component=\"medusaContentRecommendation\" data-medusa-content-recommendation-options=\"{&quot;promo&quot;:&quot;promo_zd_recommendation_sharethrough_top_in_article_desktop&quot;,&quot;spot&quot;:&quot;dfp-in-article&quot;}\">\n<\/section>\n<p>The OpenSSH app uses the &#8220;ssh-rsa&#8221; mode to generate <a href=\"https:\/\/www.ssh.com\/ssh\/public-key-authentication\" target=\"_blank\" rel=\"noopener noreferrer nofollow\" data-component=\"externalLink\">SSH authentication keys<\/a>. One of these keys is stored on the server a user wants to log in, and the other is stored in the user&#8217;s local OpenSSH client, allowing users to access servers without having to enter their passwords on every login, presenting the local authentication key instead.<\/p>\n<p>By default, the OpenSSH ssh-rsa mode generates these keys by using the SHA-1 hashing function, meaning these keys are susceptible to SHAterred attacks, allowing threat actors to generate duplicate keys.<\/p>\n<p>&#8220;This algorithm is unfortunately still used widely despite the existence of better alternatives, being the only remaining public key signature algorithm specified by the original SSH RFCs,&#8221; OpenSSH devs said today.<\/p>\n<p>The OpenSSH team is now asking server owners to check if their keys have been generated with the default ssh-rsa mode, and generate new ones using a different mode.<\/p>\n<p>Recommended modes are rsa-sha2-256\/512 (supported since OpenSSH 7.2), ssh-ed25519 (supported since OpenSSH 6.5) or ecdsa-sha2-nistp256\/384\/521 (supported since OpenSSH 5.7), the OpenSSH team said.<\/p>\n<div class=\"twitterContainer\" readability=\"5.9962264150943\">\n<blockquote class=\"twitter-tweet\" data-conversation=\"none\" readability=\"5.9962264150943\">\n<p lang=\"en\" dir=\"ltr\">here&#8217;s the best piece of the recent announcement. RIP &amp; one minute silence to all embedded systems and appliances that will never see an upgrade for deprecating ssh-rsa SHA-1 based keys in OpenSSH. <a href=\"https:\/\/t.co\/zf5VewugC6\" rel=\"noopener noreferrer nofollow\" target=\"_blank\" data-component=\"externalLink\">pic.twitter.com\/zf5VewugC6<\/a><\/p>\n<p>\u2014 Julio (@juliocesarfort) <a href=\"https:\/\/twitter.com\/juliocesarfort\/status\/1265555756767731713?ref_src=twsrc%5Etfw\" rel=\"noopener noreferrer\" target=\"_blank\" data-component=\"externalLink\">May 27, 2020<\/a><\/p><\/blockquote>\n<\/div>\n<p>The OpenSSH project will by disabling the ssh-rsa mode by default in a future (currently unspecified) release, however, before that, they also plan to enable the <em>UpdateHostKeys<\/em> feature by default, to allow server owners to easily and automatically migrate from the old ssh-rsa mode to better authentication algorithms.<\/p>\n<p>Server owners who rely on OpenSSH to manage remote systems can find additional details on how to test their server for weak SHA-1-based keys in the <a href=\"http:\/\/www.openssh.com\/txt\/release-8.3\" target=\"_blank\" rel=\"noopener noreferrer nofollow\" data-component=\"externalLink\">OpenSSH 8.3 changelog<\/a>.<\/p>\n<p>In a previous release, in version 8.2, the OpenSSH team also added <a href=\"https:\/\/www.zdnet.com\/article\/openssh-adds-support-for-fidou2f-security-keys\/\" target=\"_blank\" rel=\"noopener noreferrer\">support for FIDO\/U2F-based hardware security keys<\/a>, which can also be used to log into remote servers in even a safer manner.<\/p>\n<p> READ MORE <a href=\"https:\/\/packetstormsecurity.com\/news\/view\/31244\/OpenSSH-To-Deprecate-SHA-1-Logins-Due-To-Security-Risk.html\">HERE<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>READ MORE HERE&#8230;<\/p>\n","protected":false},"author":2,"featured_media":35208,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"colormag_page_layout":"default_layout","footnotes":""},"categories":[60],"tags":[5785],"class_list":["post-35207","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-packet-storm","tag-headlineprivacyflawcryptography"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>OpenSSH To Deprecate SHA-1 Logins Due To Security Risk 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\" 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