Microsoft Exchange ApprovedApplication Exposed Dangerous Method NTLM Relay Vulnerability

October 16th, 2024
ZDI-22-1601 ZDI-CAN-18881

CVE ID

CVE-2022-41078

CVSS Score

8.8 AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected Vendors

Microsoft

Affected Products

Exchange

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 ApprovedApplication class. The issue results from an exposed dangerous method. 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-2022-41078

Disclosure Timeline

  • 2022-09-20 - Vulnerability reported to vendor
  • 2024-10-16 - Coordinated public release of advisory
  • 2024-10-16 - Advisory Updated

Credit

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

Back to Advisories