Microsoft SharePoint AdRotator Improper Input Validation NTLM Relay Vulnerability

2023-05-1000:00:00

Piotr Bazydlo (@chudypb) of Trend Micro Zero Day Initiative

www.zerodayinitiative.com

microsoft sharepoint

adrotator

improper input validation

ntlm relay vulnerability

remote attackers

authentication

webcontrol

lack of proper input validation

service account

0.001 Low

EPSS

Percentile

48.4%

JSON

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.