CVE-2021-3671

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Source
https://cve.org/CVERecord?id=CVE-2021-3671
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-3671.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2021-3671
Downstream
Related
Published
2021-10-12T18:15:08.357Z
Modified
2026-03-15T22:41:31.565791Z
Severity
  • 6.5 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
[none]
Details

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.

References

Affected packages

Git / github.com/heimdal/heimdal

Affected ranges

Type
GIT
Repo
https://github.com/heimdal/heimdal
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
04171147948d0a3636bc6374181926f0fb2ec83a
Type
GIT
Repo
https://github.com/samba-team/samba
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
aa756f3f9fc88bbd10c6a3a7c1827ca09a669714
Introduced
9b49519cae3e967af9ea48dc5fcfb6c145e31db4
Fixed
d1c9330fa69ba6942ab23843e21acc11767d54ee
Database specific 
{
    "versions": [
        {
            "introduced": "0"
        },
        {
            "fixed": "4.13.12"
        },
        {
            "introduced": "4.14.0"
        },
        {
            "fixed": "4.14.8"
        }
    ]
}

Affected versions

Other
git2svn-syncpoint-master
switch-from-svn-to-git
heimdal-1.*
heimdal-1.3.0pre1
heimdal-1.3.0pre10
heimdal-1.3.0pre11
heimdal-1.3.0pre3
heimdal-1.3.0pre4
heimdal-1.3.0pre5
heimdal-1.3.0pre6
heimdal-1.3.0pre7
heimdal-1.3.0pre8
heimdal-1.3.0pre9
heimdal-1.3.0rc1
heimdal-1.5pre1
heimdal-1.5pre2
ldb-2.*
ldb-2.3.0
samba-4.*
samba-4.14.0
samba-4.14.1
samba-4.14.2
samba-4.14.3
samba-4.14.4
samba-4.14.5
samba-4.14.6
samba-4.14.7
upstream-1.*
upstream-1.4.0+git20101228.dfsg.1
upstream-1.4.0+git20110220.dfsg.1

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-3671.json"
unresolved_ranges 
[
    {
        "events": [
            {
                "introduced": "0"
            },
            {
                "last_affected": "10.0"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "0"
            },
            {
                "last_affected": "11.0"
            }
        ]
    }
]
vanir_signatures 
[
    {
        "signature_version": "v1",
        "target": {
            "file": "kdc/krb5tgs.c"
        },
        "source": "https://github.com/heimdal/heimdal/commit/04171147948d0a3636bc6374181926f0fb2ec83a",
        "deprecated": false,
        "digest": {
            "line_hashes": [
                "71814477620078668530731684481303091670",
                "284346098059572621942400253662874014995",
                "63355110677909982606625851675836965070",
                "200771017170665811656047669952130469804"
            ],
            "threshold": 0.9
        },
        "id": "CVE-2021-3671-5f6e87fc",
        "signature_type": "Line"
    },
    {
        "signature_version": "v1",
        "target": {
            "file": "kdc/krb5tgs.c",
            "function": "tgs_build_reply"
        },
        "source": "https://github.com/heimdal/heimdal/commit/04171147948d0a3636bc6374181926f0fb2ec83a",
        "deprecated": false,
        "digest": {
            "function_hash": "332444689167320886733846614105216309617",
            "length": 21025.0
        },
        "id": "CVE-2021-3671-e212c18a",
        "signature_type": "Function"
    }
]