Attacker Value
Unknown
(2 users assessed)
Exploitability
Unknown
(2 users assessed)
User Interaction
None
Privileges Required
High
Attack Vector
Network
2

CVE-2020-17049

Disclosure Date: November 11, 2020
Exploited in the Wild
Add MITRE ATT&CK tactics and techniques that apply to this CVE.

Description

Kerberos Security Feature Bypass Vulnerability

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2
Technical Analysis

Based on https://twitter.com/jakekarnes42/status/1329825159247642624
“The vulnerability impacts constrained delegation, which could be present in a single domain/forest. “
Note that the patch itself requires registry keys to be entered. Merely installing updates does not appear to protect the domain. There are issues introduced by this patch with Citrix and Federated Authentication service. (source https://twitter.com/mrgrayaz/status/1328517824633978912)

CVSS V3 Severity and Metrics
Base Score:
7.2 High
Impact Score:
5.9
Exploitability Score:
1.2
Vector:
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Attack Vector (AV):
Network
Attack Complexity (AC):
Low
Privileges Required (PR):
High
User Interaction (UI):
None
Scope (S):
Unchanged
Confidentiality (C):
High
Integrity (I):
High
Availability (A):
High

General Information

Vendors

  • Microsoft

Products

  • Windows Server,
  • Windows Server, version 1909 (Server Core installation),
  • Windows Server, version 1903 (Server Core installation),
  • Windows Server, version 2004 (Server Core installation),
  • Windows Server, version 20H2 (Server Core Installation)

Exploited in the Wild

Reported by:
Reported: December 09, 2020 12:22am UTC (4 months ago)

Additional Info

Technical Analysis