{"id":43653,"date":"2021-10-26T15:14:49","date_gmt":"2021-10-26T15:14:49","guid":{"rendered":"https:\/\/packetstormsecurity.com\/news\/view\/32755\/CISA-Warns-Of-Remote-Code-Execution-Vulnerability-With-Discourse.html"},"modified":"2021-10-26T15:14:49","modified_gmt":"2021-10-26T15:14:49","slug":"cisa-warns-of-remote-code-execution-vulnerability-with-discourse","status":"publish","type":"post","link":"https:\/\/www.threatshub.org\/blog\/cisa-warns-of-remote-code-execution-vulnerability-with-discourse\/","title":{"rendered":"CISA Warns Of Remote Code Execution Vulnerability With Discourse"},"content":{"rendered":"<div><img decoding=\"async\" src=\"https:\/\/www.zdnet.com\/a\/img\/resize\/d178df15fc3ec23a5110476d5ccdb001a345cb45\/2021\/10\/06\/d637fa38-32ac-41fe-9ae5-d0a76a785711\/tax-security-lock.jpg?width=770&amp;height=578&amp;fit=crop&amp;auto=webp\" class=\"ff-og-image-inserted\"><\/div>\n<div class=\"relatedContent alignRight\">\n<h3 class=\"heading\"> <span class=\"int\">Open Source<\/span> <\/h3>\n<\/p><\/div>\n<p>CISA <a href=\"https:\/\/us-cert.cisa.gov\/ncas\/current-activity\/2021\/10\/24\/critical-rce-vulnerability-discourse\" target=\"_blank\" rel=\"noopener noreferrer nofollow\" data-component=\"externalLink\">urged<\/a> developers to update Discourse versions 2.7.8 and earlier in a notice sent out on Sunday, warning that a remote code execution vulnerability was tagged as &#8220;critical.&#8221;&nbsp;<\/p>\n<p>The issue <a href=\"https:\/\/github.com\/discourse\/discourse\/security\/advisories\/GHSA-jcjx-pvpc-qgwq\" target=\"_blank\" rel=\"noopener noreferrer nofollow\" data-component=\"externalLink\">was patched<\/a> on Friday, and developers explained that <a href=\"https:\/\/nvd.nist.gov\/vuln\/detail\/CVE-2021-41163\" target=\"_blank\" rel=\"noopener noreferrer nofollow\" data-component=\"externalLink\">CVE-2021-41163<\/a> involved &#8220;a validation bug in the upstream aws-sdk-sns gem&#8221; that could &#8220;lead to RCE in Discourse via a maliciously crafted request.&#8221;<\/p>\n<p>Developers noted that to work around the issue without updating, &#8220;requests with a path starting \/webhooks\/aws could be blocked at an upstream proxy.&#8221;<\/p>\n<p>The popular open source discussion platform <a href=\"https:\/\/www.similartech.com\/technologies\/discourse\" target=\"_blank\" rel=\"noopener noreferrer nofollow\" data-component=\"externalLink\">attracts millions of users<\/a> every month, prompting the message from CISA urging updates to be pushed through.&nbsp;<\/p>\n<p>Researchers <a href=\"https:\/\/0day.click\/recipe\/discourse-sns-rce\/\" target=\"_blank\" rel=\"noopener noreferrer nofollow\" data-component=\"externalLink\">have detailed the finer points<\/a> of the problem in blog posts and reported the issue to Discourse, which did not respond to requests for comment.&nbsp;<\/p>\n<p><a href=\"https:\/\/www.bleepingcomputer.com\/news\/security\/cisa-urges-admins-to-patch-critical-discourse-code-execution-bug\/\" target=\"_blank\" rel=\"noopener noreferrer nofollow\" data-component=\"externalLink\">BleepingComputer<\/a> conducted a search on Shodan that found all Discourse SaaS instances have been patched.&nbsp;<\/p>\n<p>Saryu Nayyar, CEO of cybersecurity company Gurucul, said Discourse &#8220;continues to make news after researchers discovered a vulnerability that enabled attackers to invoke OS commands at the Administrator level.&#8221;&nbsp;<\/p>\n<section class=\"sharethrough-top placeholder\"> <\/section>\n<p>&#8220;It&#8217;s critically important for both systems administrators and individual users to keep up with security information from software providers and to install patches promptly. We can&#8217;t rely on Microsoft or other OS vendors to automatically push patches to our systems. Users of Discourse software should test and install this patch as their most important priority,&#8221; Nayyar said.&nbsp;<\/p>\n<p>&#8220;Most user computers don&#8217;t have computer admin access. If the only admin access on a computer is through the network administrator account, if you can execute using admin access, hackers have the potential to send a command that can compromise the entire network.&#8221;<\/p>\n<p>Haystack Solutions CEO Doug Britton said the vulnerability is dangerous because it can be run remotely without already being an authenticated user on the victim server.<\/p>\n<p>&#8220;Level 10 bugs are undoubtedly the most serious vulnerabilities. Discourse is a major communications platform,&#8221; Britton said.&nbsp;<\/p>\n<p> READ MORE <a href=\"https:\/\/packetstormsecurity.com\/news\/view\/32755\/CISA-Warns-Of-Remote-Code-Execution-Vulnerability-With-Discourse.html\">HERE<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>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":[60],"tags":[6978],"class_list":["post-43653","post","type-post","status-publish","format-standard","hentry","category-packet-storm","tag-headlinegovernmentusaflaw"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>CISA Warns Of Remote Code Execution Vulnerability With Discourse 2026 | ThreatsHub Cybersecurity News<\/title>\n<meta name=\"description\" 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