ZDI-21-826: (Pwn2Own) Microsoft Exchange Server CabUtility ExtractCab Directory Traversal Remote Code Execution Vulnerability
This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of Microsoft Exchange Server. User interaction is required to exploit this vulnerability. The specific flaw exists within the parsing of CAB files. When handling filenames specified within a CAB file, the process does not properly validate a user-supplied path prior to using it in file operations. 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 |
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Reference Links
Frequently Asked Questions
What is the severity of ZDI-21-826?
The severity of ZDI-21-826 is categorized as critical due to the potential for arbitrary code execution.
How do I fix ZDI-21-826?
To fix ZDI-21-826, apply the latest security patches provided by Microsoft for Exchange Server.
Who is affected by ZDI-21-826?
ZDI-21-826 affects installations of Microsoft Exchange Server that handle CAB files.
Is user interaction required for ZDI-21-826 exploitation?
Yes, user interaction is required to exploit the ZDI-21-826 vulnerability.
What types of attacks can exploit ZDI-21-826?
ZDI-21-826 can be exploited by network-adjacent attackers to execute arbitrary code.
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