CVE-2023-21744: Microsoft SharePoint Server Remote Code Execution Vulnerability

Overview

Severity
High (CVSS 8.8)
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Category
Remote Code Execution
Exploit Status
Not Exploited
Exploitation Likelihood
Less Likely
Patch Tuesday
2023-Jan
Released
2023-01-10
EPSS Score
28.16% (percentile: 96.5%)

FAQ

According to the CVSS metric, privileges required is low (PR:L). What does that mean for this vulnerability? The attacker must be authenticated and possess the permissions for page creation to be able to exploit this vulnerability. How could an attacker exploit this vulnerability? In a network-based attack an attacker would need to have the privileges to create a page on a vulnerable SharePoint server. By creating a site using specific code, the attacker could execute code remotely on the target server. I am running SharePoint Enterprise Server 2013 Service Pack 1. Do I need to install both updates that are listed for SharePoint Enterprise Server 2013 Service Pack 1? No. The Cumulative update for SharePoint Server 2013 includes the update for Foundation Server 2013. Customers running SharePoint Server 2013 Service Pack 1 can install the cumulative update or the security update, which is the same update as for Foundation Server 2013. Please note that this is a clarification of the existing servicing model for SharePoint Server 2013 and applies for all previous updates.

Affected Products (5)

Microsoft Office

  • Microsoft SharePoint Enterprise Server 2016
  • Microsoft SharePoint Enterprise Server 2013 Service Pack 1
  • Microsoft SharePoint Server 2019
  • Microsoft SharePoint Server Subscription Edition
  • Microsoft SharePoint Foundation 2013 Service Pack 1

Security Updates (5)

Acknowledgments

<a href="https://github.com/zcgonvh">zcgonvh</a> with 360 noah lab

Revision History

  • 2023-01-10: Information published.