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[FD] Microsoft Sharepoint 2013 - Limited Access Permission Bypass Vulnerability

Document Title:
Microsoft Sharepoint 2013 - Limited Access Permission Bypass Vulnerability

References (Source):

Release Date:

Vulnerability Laboratory ID (VL-ID):

Common Vulnerability Scoring System:

Vulnerability Class:
Filter or Protection Mechanism Bypass

Current Estimated Price:
1.000€ - 2.000€

Abstract Advisory Information:
An independent vulnerability laboratory researcher discovered a permission bypass vulnerability in the Microsoft Sharepoint online service web-application.

Vulnerability Disclosure Timeline:
2018-01-07: Public Disclosure (Vulnerability Laboratory)

Discovery Status:

Affected Product(s):
Microsoft Corporation
Product: Sharepoint Online Service - (Web-Application) 2013

Exploitation Technique:

Severity Level:

Technical Details & Description:
A permission level bypass web vulnerability has been identified in the microsoft sharePoint 2013 online service 
web-application & maybe prior versions. The security vulnerability allows attackers to open or view restricted 
items in the site or library. An authenticated user can bypass `Limited Access` permissions to browse a page or 
library to access a specific content item that was restricted.

Proof of Concept (PoC):
POC 1:
1. Search for specific words inside web & mobile sharepoint search box: `password` `pass` `user` `domainuser` `name | lastname` ...

[~] web search: 	http://site/BSearch/results.aspx
[~] mobie search: 	http://site/_layouts/mobile/MobileResults.aspx

example : http://site/BSearch/results.aspx?k=password
example : http://site/BSearch/results.aspx?k="NSA1377";
example : http://site/_layouts/mobile/MobileResults.aspx?k=pass
example : http://site/_layouts/mobile/MobileResults.aspx?k=BOB

2. The page shown some of sharepoint's search results like restricted specific item, site, library urls etc
3. so click at the urls to access|viwe|read site page and other restricted library and items

POC 2:
After capturing packets between our system and the sharepoint site (use fiddler or burpsiute, wireshark ...) 
We have access to items, list, pages, sites urls like as follows:


Access to restricted items & lists by make /LIST#/ urls 


Security Risk:
The security risk of the bypass vulnerability in the microsoft sharepoint 2013 application is estimated as medium (CVSS 4.8).

Credits & Authors:
Behnam Vanda [beni.vanda AT gmail.com] [redhathackers] - https://www.vulnerability-lab.com/show.php?user=Behnam+Vanda

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