Privilege escalation in implementation of Microsoft Kerberos TGT delegation

Published: 2019-02-13 | Updated: 2019-02-13
Severity Low
Patch available YES
Number of vulnerabilities 1
CVE ID N/A
CWE ID CWE-264
Exploitation vector Network
Public exploit N/A
Vulnerable software Windows Subscribe
Windows Server
Vendor Microsoft

Security Advisory

This security advisory describes one low risk vulnerability.

1) Permissions, Privileges, and Access Controls

Severity: Low

CVSSv3: 5.6 [CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N/E:U/RL:W/RC:C] [PCI]

CVE-ID: N/A

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Description

The vulnerability allows a remote attacker to escalate privileges within the domain.

A security issue exists in the way Ticket-Granting Tickets (TGT) are processed within the Active Directory forests.A remote attacker can acquire a TGT from a domain with an inbound trust and use it to escalate privileges within a neighbor forest.

Successful exploitation of the vulnerability requires that TGT delegation is enabled.

Mitigation

To resolve this issue Microsoft recommends installing a security patch and disable TGT delegation:
etdom.exe trust fabrikam.com /domain:contoso.com /EnableTGTDelegation:No

Vulnerable software versions

Windows: 7, 8.1, 10, 10 1607, 10 1703, 10 1709, 10 1803, 10 1809, RT 8.1

Windows Server: 1709, 1803, 2008, 2008 R2, 2012, 2012 R2, 2016, 2019

CPE External links

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/ADV190006

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.