Vulnerability Monitor

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CVE-2020-17049

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.

Published

2020-11-11T07:15:16.543

Last Modified

2024-11-21T05:07:42.727

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 6.6 (MEDIUM)

CVSSv2 Vector

AV:N/AC:L/Au:S/C:C/I:C/A:C

  • Access Vector: NETWORK
  • Access Complexity: LOW
  • Authentication: SINGLE
  • Confidentiality Impact: COMPLETE
  • Integrity Impact: COMPLETE
  • Availability Impact: COMPLETE
Exploitability Score

8.0

Impact Score

10.0

Weaknesses
  • Type: Primary
    CWE-863
Affected Vendors & Products
Type Vendor Product Version/Range Vulnerable?
Operating System microsoft windows_server_2012 * Yes
Operating System microsoft windows_server_2012 r2 Yes
Operating System microsoft windows_server_2016 - Yes
Operating System microsoft windows_server_2016 20h2 Yes
Operating System microsoft windows_server_2016 1903 Yes
Operating System microsoft windows_server_2016 1909 Yes
Operating System microsoft windows_server_2016 2004 Yes
Operating System microsoft windows_server_2019 - Yes
Application samba samba < 4.13.13 Yes
Application samba samba < 4.14.9 Yes
Application samba samba < 4.15.1 Yes
References