Microsoft Exchange IsUNCPath Improper Input Validation NTLM Relay Vulnerability
November 15th, 2023
Vulnerability Details
This vulnerability allows remote attackers to relay NTLM credentials on affected installations of Microsoft Exchange. Authentication is required to exploit this vulnerability.
The specific flaw exists within the IsUNCPath method. The issue results from the lack of proper input validation. An attacker can leverage this vulnerability to relay NTLM credentials in the context of SYSTEM.
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-2023-36035
Disclosure Timeline
- 2023-08-25 - Vulnerability reported to vendor
- 2023-11-15 - Coordinated public release of advisory
Credit
Piotr Bazydlo (@chudypb) of Trend Micro Zero Day Initiative
