Home/CVE/A security feature bypass vulnerability exists in the way Key Distribution Center (KDC) determines if a service ticket c
CVE

CVE-2020-17049

A security feature bypass vulnerability exists in the way Key Distribution Center (KDC) determines if a service ticket c

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.

MEDIUM · CVSS 6.6 EPSS 0.25552
Schedule remediation
  • EPSS ≥ 0.10 - elevated exploitation probability
  • EPSS percentile: top 4% of all CVEs by exploitation likelihood
Sigma rules0 YARA rules0

Weakness Classification

Affected Products & Versions

6
samba>= 4.1.0 and < 4.13.13
samba>= 4.14.0 and < 4.14.9
samba>= 4.15.0 and < 4.15.1

Scoring & Timeline

6.6
MEDIUM · CVSS v3.1 · secure@microsoft.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD11 Nov 2020 · 07:15 AM
CVSS VectorCVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
no
Technical impact
total
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.

Vendor Advisories

11
suse-csafopenSUSE-SU-2024:11631-1
suse-csafopenSUSE-SU-2024:13200-1
rhsaRHSA-2024:0252Moderate
rhsaRHSA-2024:0143Moderate
rhsaRHSA-2024:0137Moderate
🔗

References & Sources

3
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
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