ZDI-21-819: (Pwn2Own) Microsoft Exchange Server Arbitrary File Write Remote Code Execution Vulnerability
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.
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Microsoft Exchange |
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Reference Links
Frequently Asked Questions
What is the severity of ZDI-21-819?
The severity of ZDI-21-819 is considered critical due to its ability to allow remote code execution.
How do I fix ZDI-21-819?
To fix ZDI-21-819, apply the latest security updates provided by Microsoft for Exchange Server.
What versions of Microsoft Exchange are affected by ZDI-21-819?
ZDI-21-819 affects multiple supported versions of Microsoft Exchange Server.
What kind of attack can exploit ZDI-21-819?
ZDI-21-819 can be exploited by remote attackers to execute arbitrary code on the affected system.
Is authentication required to exploit ZDI-21-819?
Yes, while authentication is required, the authentication mechanism may be bypassed.
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