Microsoft SharePoint Server Elevation of Privilege Vulnerability (CVE-2023-29357)

Fortiguard Security Advisory

What is the vulnerability?
A vulnerability in Microsoft SharePoint Server is actively being exploited and targeting servers from Government, Telco and Education industries. The vulnerability tracked under CVE-2023-29357 is an authentication bypass vulnerability that adversaries may use to escalate privileges on affected installations of Microsoft SharePoint Server. Attackers may chain the vulnerability with other vulnerabilities for remote code execution to compromise the integrity, availability, and confidentiality of the target system.

What is the Vendor Solution?

Microsoft has released an official patch for the vulnerability CVE-2023-29357 in June, 2023.
[ Link ]

What FortiGuard Coverage is available?

FortiGuard Labs has protection coverage via IPS signature “MS.SharePoint.Server.CVE-2023-29357.Privilege.Escalation” for CVE-2023-29357 since June, 2023. Also, FortiGuard has coverage to detect any vulnerable systems via Endpoint Vulnerability.
FortiGuard Labs recommends companies to scan their environment, find vulnerable Microsoft SharePoint servers, and upgrade as per vendor advisory and always follow best practices.