{"id":57153,"date":"2024-09-20T16:18:51","date_gmt":"2024-09-20T16:18:51","guid":{"rendered":"https:\/\/packetstormsecurity.com\/news\/view\/36374\/Exploiting-Exploiting-Exchange-PowerShell-After-ProxyNotShell-Part-3-DLL-Loading-Chain-for-RCE.html"},"modified":"2024-09-20T16:18:51","modified_gmt":"2024-09-20T16:18:51","slug":"exploiting-exploiting-exchange-powershell-after-proxynotshell-part-3-dll-loading-chain-for-rce","status":"publish","type":"post","link":"https:\/\/www.threatshub.org\/blog\/exploiting-exploiting-exchange-powershell-after-proxynotshell-part-3-dll-loading-chain-for-rce\/","title":{"rendered":"Exploiting Exploiting Exchange PowerShell After ProxyNotShell: Part 3 \u2013 DLL Loading Chain for RCE"},"content":{"rendered":"<div><img decoding=\"async\" src=\"http:\/\/static1.squarespace.com\/static\/5894c269e4fcb5e65a1ed623\/58a5b38cb3db2bd67b608658\/66eb2241c9b27c27492158f7\/1726772202685\/flower-stone-biology-broken-blue-empty-732133-pxhere.com.jpg?format=1500w\" class=\"ff-og-image-inserted\"><\/div>\n<p>At <code>[1]<\/code>, the code retrieves a listing of all files in the random temporary directory.<\/p>\n<p>At <code>[2]<\/code>, it iterates over those files, and at <code>[3]<\/code> it deletes them.<\/p>\n<p>At <code>[4]<\/code>, it deletes the entire directory. <b data-preserve-html-node=\"true\">Please note that the second argument is equal to <code>false<\/code><\/b>. This means that the directory deletion operation is not recursive, and later on we are going to abuse that.<\/p>\n<p>When I fully analyzed the <code>DumpDataReader<\/code> constructor, I realized that there are multiple obstacles in the way of using this as our file write primitive: <\/p>\n<p>\u2022\tWe can only extract files ending with <code>dmp<\/code>, whereas we need to drop a file with the specific name <code>FUSE.Paxos.dll<\/code>, as hardcoded in the DLL loading gadget.<br \/>\u2022\tFiles will be removed right after the extraction.<br \/>\u2022\tFiles are extracted to a path containing a GUID, and we can\u2019t predict that path name, whereas we would need to provide a full path to the DLL loading gadget.<br \/>\u2022\tThe attacker\u2019s string (path) is verified with <code>File.Exists<\/code>. Later on, we will see how this is problematic.<br \/>\u2022\tWe may need to extract more than one file, and we will see below how this also presents a minor difficulty. <\/p>\n<p>You can see that the list is quite long, so the gadget appears useless at this point. However, I realized that the <code>expand<\/code> call itself is <b data-preserve-html-node=\"true\">vulnerable to Argument Injection<\/b>. I started playing with <code>expand<\/code> by testing various arguments, and it turned out that this injection was enough to bypass all the above restrictions! Now let us see how.<\/p>\n<p><b data-preserve-html-node=\"true\">1. DumpDataReader: Extracting files with extension other than DMP<\/b><\/p>\n<p>The first restriction that we want to bypass is the one that prevents extraction of files unless the filename ends with <code>dmp<\/code>. This is due to the<code>-F<\/code> switch provided to the <code>expand<\/code> utility:<\/p>\n<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<code>expand -F:*dmp attacker-path C:\\Windows\\Temp\\&lt;random-guid&gt;<\/code><\/p>\n<p>Let&#8217;s consider a file <code>f.cab<\/code> that contains our malicious <code>FUSE.Paxos.dll<\/code>. We should not be able to extract it and preserve its name, due to the <code>-F:*dmp<\/code> argument. While playing around, I noticed that if either <code>-r<\/code> or <code>-i<\/code> is provided to <code>expand<\/code>, the <code>-F<\/code> argument is completely ignored! In the next screenshot, I have bypassed the extension-based protection by injecting the <code>-i<\/code> argument.<\/p>\n<p> READ MORE <a href=\"https:\/\/packetstormsecurity.com\/news\/view\/36374\/Exploiting-Exploiting-Exchange-PowerShell-After-ProxyNotShell-Part-3-DLL-Loading-Chain-for-RCE.html\">HERE<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>READ MORE HERE&#8230;<\/p>\n","protected":false},"author":2,"featured_media":57154,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"colormag_page_layout":"default_layout","footnotes":""},"categories":[277],"tags":[5505],"class_list":["post-57153","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cybersecurity-blogs","tag-headlinehackermicrosoftflaw"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Exploiting Exploiting Exchange PowerShell 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