Microsoft SharePoint WSSXmlUrlResolver Server-Side Request Forgery Vulnerability

2023-04-1100:00:00

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

www.zerodayinitiative.com

microsoft sharepoint

wssxmlurlresolver

ssrf

vulnerability

remote attackers

sensitive information

authentication

lack of validation

uri

accessing resources

iusr

0.005 Low

EPSS

Percentile

76.0%

JSON

This vulnerability allows remote attackers to disclose sensitive information on affected installations of Microsoft SharePoint. Authentication is required to exploit this vulnerability. The specific flaw exists within the WSSXmlUrlResolver class. The issue results from the lack of proper validation of a URI prior to accessing resources. An attacker can leverage this vulnerability to disclose information in the context of IUSR.