CVEvulnerability

CVE-2020-17049

6.6 MEDIUM Published 2020-11-11 Modified 2026-06-17 Official page ↗
Status
Modified
Published
2020-11-11
Last modified
2026-06-17
Assigner
[email protected]
CVSS 3.1 ([email protected])
6.6 MEDIUM — CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
CVSS 3.1 ([email protected])
7.2 HIGH — CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0 ([email protected])
9.0 HIGH — AV:N/AC:L/Au:S/C:C/I:C/A:C
Weaknesses
CWE-863

Description

A security feature bypass vulnerability exists in the way Key Distribution Center (KDC) determines if a service ticket can be used for delegation via Kerberos Constrained Delegation (KCD). To exploit the vulnerability, a compromised service that is configured to use KCD could tamper with a service ticket that is not valid for delegation to force the KDC to accept it. The update addresses this vulnerability by changing how the KDC validates service tickets used with KCD.

Affected configurations

• microsoft windows server 2012 • microsoft windows server 2012 r2 • microsoft windows server 2016 • microsoft windows server 2016 20h2 • microsoft windows server 2016 1903 • microsoft windows server 2016 1909 • microsoft windows server 2016 2004 • microsoft windows server 2019 • samba samba (>= 4.1.0 < 4.13.13) • samba samba (>= 4.14.0 < 4.14.9) • samba samba (>= 4.15.0 < 4.15.1)

Related

Weakness · CWE (1)

  • CWE-863 Incorrect Authorization weakness

References