CVE-2021-3671 : A null pointer de-reference was found in the way samba kerberos server handled m

A null pointer de-reference was found in the way samba kerberos server handled missing sname in TGS-REQ (Ticket Granting Server - Request). An authenticated user could use this flaw to crash the samba server.

Published 2021-10-12 18:15:08

Updated 2023-02-24 17:39:38

Source Red Hat, Inc.

View at NVD, CVE.org

Products affected by CVE-2021-3671

Debian » Debian Linux » Version: 10.0
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
Matching versions
Debian » Debian Linux » Version: 11.0
cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*
Matching versions
Samba » Samba
Versions from including (>=) 4.14.0 and before (<) 4.14.8
cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:*
Matching versions
Samba » Samba
Versions before (<) 4.13.12
cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:*
Matching versions
Netapp » Ontap Select Deploy Administration Utility » Version: N/A
cpe:2.3:a:netapp:ontap_select_deploy_administration_utility:-:*:*:*:*:*:*:*
Matching versions
Netapp » Management Services For Element Software » Version: N/A
cpe:2.3:a:netapp:management_services_for_element_software:-:*:*:*:*:*:*:*
Matching versions
Netapp » Management Services For Netapp Hci » Version: N/A
cpe:2.3:a:netapp:management_services_for_netapp_hci:-:*:*:*:*:*:*:*
Matching versions

Exploit prediction scoring system (EPSS) score for CVE-2021-3671

EPSS FAQ

1.13%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 76 %

Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2021-3671

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
4.0	MEDIUM	AV:N/AC:L/Au:S/C:N/I:N/A:P	8.0	2.9	NIST
Access Vector: Network Access Complexity: Low Authentication: Single Confidentiality Impact: None Integrity Impact: None Availability Impact: Partial
6.5	MEDIUM	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H	2.8	3.6	NIST
Attack Vector: Network Attack Complexity: Low Privileges Required: Low User Interaction: None Scope: Unchanged Confidentiality: None Integrity: None Availability: High

CWE ids for CVE-2021-3671

CWE-476 NULL Pointer Dereference

The product dereferences a pointer that it expects to be valid but is NULL.
Assigned by:
- nvd@nist.gov (Primary)
- secalert@redhat.com (Secondary)

References for CVE-2021-3671

https://bugzilla.samba.org/show_bug.cgi?id=14770,

Broken Link;Issue Tracking
https://www.debian.org/security/2022/dsa-5287

Debian -- Security Information -- DSA-5287-1 heimdal
Third Party Advisory

CVEs referencing this url
https://bugzilla.redhat.com/show_bug.cgi?id=2013080,

Invalid Bug ID
Broken Link;Issue Tracking
https://github.com/heimdal/heimdal/commit/04171147948d0a3636bc6374181926f0fb2ec83a

kdc: validate sname in TGS-REQ · heimdal/heimdal@0417114 · GitHub
Patch;Third Party Advisory
https://security.netapp.com/advisory/ntap-20230216-0008/

December 2022 Heimdal Vulnerabilities in NetApp Products | NetApp Product Security
Third Party Advisory

CVEs referencing this url
https://security.netapp.com/advisory/ntap-20221215-0002/

CVE-2021-3671 Samba Vulnerability in NetApp Products | NetApp Product Security
Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/11/msg00034.html

[SECURITY] [DLA 3206-1] heimdal security update
Mailing List;Third Party Advisory

CVEs referencing this url

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Vulnerability Details : CVE-2021-3671

Products affected by CVE-2021-3671

Exploit prediction scoring system (EPSS) score for CVE-2021-3671

CVSS scores for CVE-2021-3671

CWE ids for CVE-2021-3671

References for CVE-2021-3671