CVE-2020-17049
Medium
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.
SeverityMedium
CVSS6.6
Exploit probability97. percentile13.8%
Product
Microsoft Windows Server
PublishedNov 11, 2020
First seenNov 11, 2020
How to fix
Update
- samba samba4.13.13, 4.14.9, 4.15.1 or later
Vendor advisories
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| microsoft windows_server_2012 | No range specified, r2 | — |
| microsoft windows_server_2016 | No range specified, 20h2, 1903, 1909, 2004 | — |
| microsoft windows_server_2019 | No range specified | — |
| samba samba | 4.1.0 ≤ v < 4.13.13, 4.14.0 ≤ v < 4.14.9, 4.15.0 ≤ v < 4.15.1 | 4.13.13, 4.14.9, 4.15.1 |
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