ZDI-21-615: (Pwn2Own) Microsoft Exchange Server Missing Check of Message Integrity Vulnerability
This vulnerability allows network-adjacent attackers to tamper with update data on affected installations of Microsoft Exchange Server. User interaction is required to exploit this vulnerability. The specific flaw exists within the handling of Exchange Server Help updates. The issue results from a missing integrity check on update downloads. An attacker can leverage this in conjunction with other vulnerabilities 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 vulnerability ID for this Microsoft Exchange Server vulnerability?
The vulnerability ID for this Microsoft Exchange Server vulnerability is ZDI-21-615.
What is the severity of vulnerability ZDI-21-615?
The severity of vulnerability ZDI-21-615 is low.
How can network-adjacent attackers exploit vulnerability ZDI-21-615?
Network-adjacent attackers can exploit vulnerability ZDI-21-615 by tampering with update data on affected installations of Microsoft Exchange Server, but user interaction is required.
What is the affected software?
The affected software is Microsoft Exchange Server.
Where can I find more information about vulnerability ZDI-21-615?
You can find more information about vulnerability ZDI-21-615 on the Microsoft Security Response Center (MSRC) website and the Zero Day Initiative (ZDI) website.
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