ZDI-23-1646: Microsoft Exchange GsmWriter Deserialization of Untrusted Data NTLM Relay Vulnerability
Published Nov 15, 2023
·Updated
This vulnerability allows remote attackers to create a denial-of-service condition or relay NTLM credentials on affected installations of Microsoft Exchange. Authentication is required to exploit this vulnerability. The ZDI has assigned a CVSS rating of 8.8. The following CVEs are assigned: CVE-2023-38181.
Affected Software
1 affected component
Microsoft Exchange
Event History
Nov 15, 2023
Advisory Published
06:00 AM
Data Sourced
06:00 AM
Description
Frequently Asked Questions
1
What is the severity of ZDI-23-1646?
The severity of ZDI-23-1646 is rated as 8.8 on the CVSS scale.
2
How do I fix ZDI-23-1646?
To fix ZDI-23-1646, apply the latest security patches provided by Microsoft for affected installations of Microsoft Exchange.
3
What type of vulnerability is ZDI-23-1646?
ZDI-23-1646 is a remote denial-of-service vulnerability that can also relay NTLM credentials.
4
Is authentication required to exploit ZDI-23-1646?
Yes, authentication is required to exploit the ZDI-23-1646 vulnerability.
5
What software is affected by ZDI-23-1646?
ZDI-23-1646 affects certain installations of Microsoft Exchange.