CVE-2023-36893: Microsoft Outlook Spoofing Vulnerability

Overview

Severity

Medium (CVSS 6.5)

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C

Category

Spoofing

Exploit Status

Not Exploited

Exploitation Likelihood

Less Likely

Patch Tuesday

2023-Aug

Released

2023-08-08

EPSS Score

0.82% (percentile: 74.4%)

FAQ

What type of information could be disclosed by this vulnerability? Exploiting this vulnerability could allow the disclosure of NetNTLMv2 hashes. Is the Preview Pane an attack vector for this vulnerability? No, the Preview Pane is not an attack vector. According to the CVSS metric, user interaction is required (UI:R). What interaction would the user have to do? This vulnerability requires that a user with an affected version of Outlook open a malicious meeting or appointment invite from the attacker.

Affected Products (11)

Microsoft Office

• Microsoft Office 2019 for 32-bit editions
• Microsoft Office 2019 for 64-bit editions
• Microsoft 365 Apps for Enterprise for 32-bit Systems
• Microsoft 365 Apps for Enterprise for 64-bit Systems
• Microsoft Office LTSC 2021 for 64-bit editions
• Microsoft Office LTSC 2021 for 32-bit editions
• Microsoft Outlook 2016 (32-bit edition)
• Microsoft Outlook 2016 (64-bit edition)
• Microsoft Outlook 2013 Service Pack 1 (32-bit editions)
• Microsoft Outlook 2013 Service Pack 1 (64-bit editions)
• Microsoft Outlook 2013 RT Service Pack 1

Security Updates (4)

• 5002459
• 5002459
• 5002449
• 5002449

Acknowledgments

<a href="https://twitter.com/mantissts">Richard Clifford</a> with <a href="https://rootshellsecurity.net/">RootshellSecurity</a>

Revision History

• 2023-08-08: Information published.