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zdiSteven Seeley (mr_me) of Source InciteZDI-21-826
HistoryJul 19, 2021 - 12:00 a.m.

(Pwn2Own) Microsoft Exchange Server CabUtility ExtractCab Directory Traversal Remote Code Execution Vulnerability

2021-07-1900:00:00
Steven Seeley (mr_me) of Source Incite
www.zerodayinitiative.com
72

0.234 Low

EPSS

Percentile

96.6%

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.