Vulnerabilities > CVE-2021-1727 - Improper Privilege Management vulnerability in Microsoft products

Attack vector

LOCAL

Attack complexity

LOW

Privileges required

LOW

Confidentiality impact

HIGH

Integrity impact

HIGH

Availability impact

HIGH

local

low complexity

NVD

Published: 2021-02-25

Updated: 2023-12-29

Summary

Windows Installer Elevation of Privilege Vulnerability

Part	Description	Count
OS	Microsoft Microsoft Windows Server 2008 R2 Microsoft Windows Server 2008 - Microsoft Windows Server 2012 R2 Microsoft Windows Server 2012 - Microsoft Windows 10 1607 Microsoft Windows 10 - Microsoft Windows 10 1803 Microsoft Windows 10 1809 Microsoft Windows 10 1909 Microsoft Windows 10 2004 Microsoft Windows 10 20H2 Microsoft Windows 8.1 - Microsoft Windows Server 2016 - Microsoft Windows Server 2016 1909 Microsoft Windows Server 2016 2004 Microsoft Windows Server 2016 20H2 Microsoft Windows 7 - Microsoft Windows RT 8.1 - Microsoft Windows Server 2019 -	19

Restful Privilege Elevation
Rest uses standard HTTP (Get, Put, Delete) style permissions methods, but these are not necessarily correlated generally with back end programs. Strict interpretation of HTTP get methods means that these HTTP Get services should not be used to delete information on the server, but there is no access control mechanism to back up this logic. This means that unless the services are properly ACL'd and the application's service implementation are following these guidelines then an HTTP request can easily execute a delete or update on the server side. The attacker identifies a HTTP Get URL such as http://victimsite/updateOrder, which calls out to a program to update orders on a database or other resource. The URL is not idempotent so the request can be submitted multiple times by the attacker, additionally, the attacker may be able to exploit the URL published as a Get method that actually performs updates (instead of merely retrieving data). This may result in malicious or inadvertent altering of data on the server.