Advisory Details

May 10th, 2023

Microsoft SharePoint AdRotator Improper Input Validation NTLM Relay Vulnerability

CVE ID	CVE-2023-24950
CVSS SCORE	8.0, AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
AFFECTED VENDORS	Microsoft
AFFECTED PRODUCTS	SharePoint
VULNERABILITY DETAILS	This vulnerability allows remote attackers to relay NTLM credentials on affected installations of Microsoft SharePoint. Authentication is required to exploit this vulnerability. The specific flaw exists within the implementation of the AdRotator WebControl. The issue results from the lack of proper input validation. An attacker can leverage this vulnerability to relay NTLM credentials of the service account.
ADDITIONAL DETAILS	Microsoft has issued an update to correct this vulnerability. More details can be found at: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-24950
DISCLOSURE TIMELINE	2023-02-10 - Vulnerability reported to vendor 2023-05-10 - Coordinated public release of advisory
CREDIT	Piotr Bazydlo (@chudypb) of Trend Micro Zero Day Initiative

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