Advisory Details

July 19th, 2021

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

CVE ID	CVE-2021-31207
CVSS SCORE	8.8, AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
AFFECTED VENDORS	Microsoft
AFFECTED PRODUCTS	Exchange
VULNERABILITY DETAILS	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.
ADDITIONAL DETAILS	Microsoft has issued an update to correct this vulnerability. More details can be found at: https://msrc.microsoft.com/update-guide/en-us/vulnerability/CVE-2021-31207
DISCLOSURE TIMELINE	2021-07-16 - Vulnerability reported to vendor 2021-07-19 - Coordinated public release of advisory
CREDIT	Orange Tsai(@orange_8361) from DEVCORE Research Team

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