{"id":35981,"date":"2020-07-09T20:32:03","date_gmt":"2020-07-09T20:32:03","guid":{"rendered":"https:\/\/www.threatshub.org\/blog\/fyi-someones-scanning-for-gateways-containing-those-security-holes-citrix-told-you-not-to-worry-too-much-about\/"},"modified":"2020-07-09T20:32:03","modified_gmt":"2020-07-09T20:32:03","slug":"fyi-someones-scanning-for-gateways-containing-those-security-holes-citrix-told-you-not-to-worry-too-much-about","status":"publish","type":"post","link":"https:\/\/www.threatshub.org\/blog\/fyi-someones-scanning-for-gateways-containing-those-security-holes-citrix-told-you-not-to-worry-too-much-about\/","title":{"rendered":"FYI: Someone&#8217;s scanning for gateways containing those security holes Citrix told you not to worry too much about"},"content":{"rendered":"<div><img decoding=\"async\" src=\"https:\/\/regmedia.co.uk\/2020\/02\/06\/shutterstock_citrix_building.jpg\" class=\"ff-og-image-inserted\"><\/div>\n<p><strong class=\"trailer\">VIdeo<\/strong> This week Citrix tried to reassure everyone the 11 security flaws it just patched in its network perimeter products weren&#8217;t all <i>that<\/i> bad. Well, we hope they&#8217;re right because someone&#8217;s scanning the internet looking for vulnerable installations.<\/p>\n<p>The sweeps could be made by researchers documenting at-risk organizations, or could be miscreants looking for unpatched internet-facing gear to meddle with, or both. You probably don&#8217;t want to find out the hard way, so apply fixes as soon as you can.<\/p>\n<p>SANS dean of research Johannes Ullrich today <a target=\"_blank\" rel=\"nofollow noopener noreferrer\" href=\"https:\/\/isc.sans.edu\/forums\/diary\/Active+Exploit+Attempts+Targeting+Recent+Citrix+ADC+Vulnerabilities+CTX276688\/26330\/\">said<\/a> his honeypot, set up to detect exploitation attempts against <a target=\"_blank\" href=\"https:\/\/www.theregister.com\/2020\/07\/03\/f5_critical_flaws_big_ip\/\" rel=\"noopener noreferrer\">bugs<\/a> in F5&#8217;s products, encountered attempts by someone to exploit a couple of the holes Citrix <a target=\"_blank\" href=\"https:\/\/www.theregister.com\/2020\/07\/08\/citrix_eleven_patches\/\" rel=\"noopener noreferrer\">patched<\/a> in its gear.<\/p>\n<p>From the logs, it appears the connections were made to determine whether or not Ullrich&#8217;s machine was vulnerable, which it wasn&#8217;t because it wasn&#8217;t running the buggy Citrix ADC, Citrix Gateway, or Citrix SD-WAN WANOP software. Perhaps if the honeypot was vulnerable, further exploitation may have been attempted. Ullrich believes the attempts targeted CVE-2020-8195 and CVE-2020-8196, both information disclosure flaws.<\/p>\n<p><i>The Register<\/i> understands the probing began shortly after Citrix CISO Fermin Serna <a target=\"_blank\" rel=\"nofollow noopener noreferrer\" href=\"https:\/\/www.citrix.com\/blogs\/2020\/07\/07\/citrix-provides-context-on-security-bulletin-ctx276688\/\">said on Tuesday<\/a> a number of the bugs had &#8220;barriers to exploitation&#8221; that would make them impractical to target in the wild.<\/p>\n<p>The first exploit that hit the honeypot, said Ullrich, attempted to fetch a file from the gateway, in this case the list of accounts and hashed passwords:<\/p>\n<pre class=\"wrap_text\">\nPOST \/rapi\/filedownload?filter=path:%2Fetc%2Fpasswd\n<\/pre>\n<p>The second exploit attempt tried to fetch a PCI DSS compliance document from the server:<\/p>\n<pre class=\"wrap_text\">\nPOST \/pcidss\/report?username=nsroot&amp;set=1&amp;type=allprofiles&amp;sid=loginchallengeresponse1requestbody\n<\/pre>\n<p>&#8220;The vulnerability isn&#8217;t all that &#8216;bad&#8217;. I have to look if the [PCI DSS] report leaks anything specific,&#8221; he said. &#8220;It could very well be used to identify unpatched devices.&#8221;<\/p>\n<p>You can find technical details on the Citrix vulnerabilities <a target=\"_blank\" rel=\"nofollow noopener noreferrer\" href=\"https:\/\/dmaasland.github.io\/posts\/citrix.html\">here<\/a>, along with proof-of-concept exploits, by Donny Maasland. This code can upload, create, download, and delete arbitrary files on a vulnerable installation, we&#8217;re told.<\/p>\n<p>And below is a video showing how the Cross Site Scripting (XSS) flaw (CVE-2020-8198) in Citrix&#8217;s software can be abused to gain control over a gateway: a logged-in administrator has to be tricked into clicking on a booby-trapped link. \u00ae<\/p>\n<p> <a href=\"https:\/\/www.youtube.com\/watch?feature=player_embedded&amp;v=1_D4_9BKHSc\" data-media=\"x-videoplayer\">Youtube Video<\/a>\n<\/p>\n<p> READ MORE <a href=\"https:\/\/go.theregister.com\/feed\/www.theregister.com\/2020\/07\/09\/citrix_bugs_proof_of_concept_exploits\/\">HERE<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Hackers hit honeypots hours after CISO downplays risk, proof-of-concept exploit code emerges VIdeo\u00a0 This week Citrix tried to reassure everyone the 11 security flaws it just patched in its network perimeter products weren&#8217;t all that bad. Well, we hope they&#8217;re right because someone&#8217;s scanning the internet looking for vulnerable installations.\u2026  READ MORE HERE&#8230;<\/p>\n","protected":false},"author":2,"featured_media":35982,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"colormag_page_layout":"default_layout","footnotes":""},"categories":[63],"tags":[],"class_list":["post-35981","post","type-post","status-publish","format-standard","has-post-thumbnail","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>FYI: Someone&#039;s scanning for gateways containing those security holes Citrix told you not to worry too much about 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 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