{"id":39916,"date":"2021-03-09T06:45:12","date_gmt":"2021-03-09T06:45:12","guid":{"rendered":"https:\/\/www.threatshub.org\/blog\/github-bug-briefly-gave-valid-authenticated-session-cookies-to-wrong-users\/"},"modified":"2021-03-09T06:45:12","modified_gmt":"2021-03-09T06:45:12","slug":"github-bug-briefly-gave-valid-authenticated-session-cookies-to-wrong-users","status":"publish","type":"post","link":"https:\/\/www.threatshub.org\/blog\/github-bug-briefly-gave-valid-authenticated-session-cookies-to-wrong-users\/","title":{"rendered":"GitHub bug briefly gave valid authenticated session cookies to wrong users"},"content":{"rendered":"<p>If you visit GitHub today you\u2019ll be asked to authenticate anew because the code collaboration locker has squished a bug that sometimes \u201cmisrouted a user\u2019s session to the browser of another authenticated user, giving them the valid and authenticated session cookie for another user.\u201d<\/p>\n<p>GitHub <a target=\"_blank\" href=\"https:\/\/github.blog\/2021-03-08-github-security-update-a-bug-related-to-handling-of-authenticated-sessions\/\" rel=\"noopener noreferrer\">disclosed<\/a> the problem today, explain that it could only happen under \u201cextremely rare circumstances\u201d and \u201coccurred in fewer than 0.001% of authenticated sessions on GitHub.com.\u201d<\/p>\n<div aria-hidden=\"true\" class=\"adun\" data-pos=\"top\" data-raptor=\"condor\" data-xsm=\",button,mpu,\" data-sm=\",button,mpu,\" data-md=\",button,banner_plus,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=2YEdAXOAXnjoGE@zkbFgURAAAAEo&amp;t=ct%3Dns%26unitnum%3D2%26raptor%3Dcondor%26pos%3Dtop%26test%3D0\" target=\"_blank\" rel=\"noopener noreferrer\"> <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=2YEdAXOAXnjoGE@zkbFgURAAAAEo&amp;t=ct%3Dns%26unitnum%3D2%26raptor%3Dcondor%26pos%3Dtop%26test%3D0\" alt> <\/a> <\/noscript> <\/div>\n<p>The service knows which users\u2019 sessions were exposed by the flaw and says it has contacted them with guidance and additional information.<\/p>\n<div aria-hidden=\"true\" class=\"adun\" data-pos=\"mid\" data-raptor=\"eagle\" data-xsm=\",button,mpu_plusplus,\" data-sm=\",button,mpu_plusplus,\" data-md=\",button,mpu_plusplus,\"> <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=33YEdAXOAXnjoGE@zkbFgURAAAAEo&amp;t=ct%3Dns%26unitnum%3D3%26raptor%3Deagle%26pos%3Dmid%26test%3D0\" target=\"_blank\" rel=\"noopener noreferrer\"> <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=33YEdAXOAXnjoGE@zkbFgURAAAAEo&amp;t=ct%3Dns%26unitnum%3D3%26raptor%3Deagle%26pos%3Dmid%26test%3D0\" alt> <\/a> <\/noscript> <\/div>\n<p>The rest of us have been told: \u201cIt is important to note that this issue was not the result of compromised account passwords, SSH keys, or personal access tokens (PATs) and there is no evidence to suggest that this was the result of a compromise of any other GitHub systems,\u201d the outfit stated.<\/p>\n<p>\u201cInstead, this issue was due to the rare and isolated improper handling of authenticated sessions. Further, this issue could not be intentionally triggered or directed by a malicious user.\u201d<\/p>\n<blockquote class=\"pullquote\"><p>This issue could not be intentionally triggered or directed by a malicious user<\/p><\/blockquote>\n<p>The confession post continues: \u201cThe underlying bug existed on GitHub.com for a cumulative period of less than two weeks at various times between February 8, 2021 and March 5, 2021.\u201d<\/p>\n<p>\u201cOnce the root cause was identified and a fix developed, we immediately patched GitHub.com on March 5. A second patch was deployed on March 8 to implement additional measures to further harden our application from this type of bug. There is no indication that other GitHub.com properties or products were affected by this issue, including GitHub Enterprise Server.\u201d<\/p>\n<p>To make sure the big was squashed, GitHub says it \u201cinvalidated all sessions \u2026 created prior to 12:03 UTC on March 8 to avoid even the remote possibility that undetected compromised sessions could still exist after the vulnerability was patched.\u201d<\/p>\n<div aria-hidden=\"true\" class=\"adun\" data-pos=\"top\" data-raptor=\"falcon\" data-xsm=\",button,dbutton,mpu_plus,dmpu,\" data-sm=\",button,dbutton,mpu_plus,dmpu,\" data-md=\",button,dbutton,mpu_plus,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=4&amp;c=44YEdAXOAXnjoGE@zkbFgURAAAAEo&amp;t=ct%3Dns%26unitnum%3D4%26raptor%3Dfalcon%26pos%3Dmid%26test%3D0\" target=\"_blank\" rel=\"noopener noreferrer\"> <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=44YEdAXOAXnjoGE@zkbFgURAAAAEo&amp;t=ct%3Dns%26unitnum%3D426raptor%3Dfalcon%26pos%3Dmid%26test%3D0\" alt> <\/a> <\/noscript> <\/div>\n<p>So now all you need to do is log back in to GitHub. \u00ae<\/p>\n<p> READ MORE <a href=\"https:\/\/go.theregister.com\/feed\/www.theregister.com\/2021\/03\/09\/github_authentication_bug\/\">HERE<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Don\u2019t panic: Fewer than 0.001% of sessions compromised through flaw that couldn\u2019t be maliciously triggered If you visit GitHub today you\u2019ll be asked to authenticate anew because the code collaboration locker has squished a bug that sometimes \u201cmisrouted a user\u2019s session to the browser of another authenticated user, giving them the valid and authenticated session cookie for another user.\u201d\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-39916","post","type-post","status-publish","format-standard","hentry","category-the-register"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>GitHub bug briefly gave valid authenticated session cookies to wrong users 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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