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zdiOrange Tsai(@orange_8361) from DEVCORE Research TeamZDI-21-819
HistoryJul 19, 2021 - 12:00 a.m.

(Pwn2Own) Microsoft Exchange Server Arbitrary File Write Remote Code Execution Vulnerability

2021-07-1900:00:00
Orange Tsai(@orange_8361) from DEVCORE Research Team
www.zerodayinitiative.com
128

0.967 High

EPSS

Percentile

99.7%

This vulnerability allows remote attackers to execute arbitrary code on affected installations of Microsoft Exchange Server. Although authentication is required to exploit this vulnerability, the existing authentication mechanism can be bypassed. The specific flaw exists within the handling of mailbox export. The issue results from the lack of proper validation of user-supplied data, which can allow the upload of arbitrary files. An attacker can leverage this vulnerability to execute arbitrary code in the context of SYSTEM.