ubuntu-cve-2021-43566
Vulnerability from osv_ubuntu
Published
2022-01-11 16:15
Modified
2026-04-22 07:40
Summary
Details
All versions of Samba prior to 4.13.16 are vulnerable to a malicious client using an SMB1 or NFS race to allow a directory to be created in an area of the server file system not exported under the share definition. Note that SMB1 has to be enabled, or the share also available via NFS in order for this attack to succeed.
Severity
N/A (UNKNOWN)
References
{
"affected": [
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libnss-winbind",
"binary_version": "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm15"
},
{
"binary_name": "libpam-smbpass",
"binary_version": "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm15"
},
{
"binary_name": "libpam-winbind",
"binary_version": "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm15"
},
{
"binary_name": "libparse-pidl-perl",
"binary_version": "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm15"
},
{
"binary_name": "libsmbclient",
"binary_version": "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm15"
},
{
"binary_name": "libsmbsharemodes0",
"binary_version": "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm15"
},
{
"binary_name": "libwbclient0",
"binary_version": "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm15"
},
{
"binary_name": "python-samba",
"binary_version": "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm15"
},
{
"binary_name": "registry-tools",
"binary_version": "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm15"
},
{
"binary_name": "samba",
"binary_version": "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm15"
},
{
"binary_name": "samba-common",
"binary_version": "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm15"
},
{
"binary_name": "samba-common-bin",
"binary_version": "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm15"
},
{
"binary_name": "samba-dsdb-modules",
"binary_version": "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm15"
},
{
"binary_name": "samba-libs",
"binary_version": "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm15"
},
{
"binary_name": "samba-testsuite",
"binary_version": "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm15"
},
{
"binary_name": "samba-vfs-modules",
"binary_version": "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm15"
},
{
"binary_name": "smbclient",
"binary_version": "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm15"
},
{
"binary_name": "winbind",
"binary_version": "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm15"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:14.04:LTS",
"name": "samba",
"purl": "pkg:deb/ubuntu/samba@2:4.3.11+dfsg-0ubuntu0.14.04.20+esm15?arch=source\u0026distro=esm-infra-legacy/trusty"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2:3.6.18-1ubuntu3",
"2:4.0.10+dfsg-4ubuntu2",
"2:4.0.13+dfsg-1ubuntu1",
"2:4.1.3+dfsg-2ubuntu2",
"2:4.1.3+dfsg-2ubuntu3",
"2:4.1.3+dfsg-2ubuntu4",
"2:4.1.3+dfsg-2ubuntu5",
"2:4.1.6+dfsg-1ubuntu1",
"2:4.1.6+dfsg-1ubuntu2",
"2:4.1.6+dfsg-1ubuntu2.14.04.1",
"2:4.1.6+dfsg-1ubuntu2.14.04.2",
"2:4.1.6+dfsg-1ubuntu2.14.04.3",
"2:4.1.6+dfsg-1ubuntu2.14.04.4",
"2:4.1.6+dfsg-1ubuntu2.14.04.5",
"2:4.1.6+dfsg-1ubuntu2.14.04.7",
"2:4.1.6+dfsg-1ubuntu2.14.04.8",
"2:4.1.6+dfsg-1ubuntu2.14.04.9",
"2:4.1.6+dfsg-1ubuntu2.14.04.11",
"2:4.1.6+dfsg-1ubuntu2.14.04.12",
"2:4.1.6+dfsg-1ubuntu2.14.04.13",
"2:4.3.8+dfsg-0ubuntu0.14.04.2",
"2:4.3.9+dfsg-0ubuntu0.14.04.1",
"2:4.3.9+dfsg-0ubuntu0.14.04.3",
"2:4.3.11+dfsg-0ubuntu0.14.04.1",
"2:4.3.11+dfsg-0ubuntu0.14.04.2",
"2:4.3.11+dfsg-0ubuntu0.14.04.3",
"2:4.3.11+dfsg-0ubuntu0.14.04.4",
"2:4.3.11+dfsg-0ubuntu0.14.04.6",
"2:4.3.11+dfsg-0ubuntu0.14.04.7",
"2:4.3.11+dfsg-0ubuntu0.14.04.8",
"2:4.3.11+dfsg-0ubuntu0.14.04.9",
"2:4.3.11+dfsg-0ubuntu0.14.04.10",
"2:4.3.11+dfsg-0ubuntu0.14.04.11",
"2:4.3.11+dfsg-0ubuntu0.14.04.12",
"2:4.3.11+dfsg-0ubuntu0.14.04.13",
"2:4.3.11+dfsg-0ubuntu0.14.04.14",
"2:4.3.11+dfsg-0ubuntu0.14.04.16",
"2:4.3.11+dfsg-0ubuntu0.14.04.17",
"2:4.3.11+dfsg-0ubuntu0.14.04.19",
"2:4.3.11+dfsg-0ubuntu0.14.04.20",
"2:4.3.11+dfsg-0ubuntu0.14.04.20+esm1",
"2:4.3.11+dfsg-0ubuntu0.14.04.20+esm2",
"2:4.3.11+dfsg-0ubuntu0.14.04.20+esm3",
"2:4.3.11+dfsg-0ubuntu0.14.04.20+esm4",
"2:4.3.11+dfsg-0ubuntu0.14.04.20+esm6",
"2:4.3.11+dfsg-0ubuntu0.14.04.20+esm7",
"2:4.3.11+dfsg-0ubuntu0.14.04.20+esm8",
"2:4.3.11+dfsg-0ubuntu0.14.04.20+esm9",
"2:4.3.11+dfsg-0ubuntu0.14.04.20+esm11",
"2:4.3.11+dfsg-0ubuntu0.14.04.20+esm12",
"2:4.3.11+dfsg-0ubuntu0.14.04.20+esm13",
"2:4.3.11+dfsg-0ubuntu0.14.04.20+esm14",
"2:4.3.11+dfsg-0ubuntu0.14.04.20+esm15"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "ctdb",
"binary_version": "2:4.3.11+dfsg-0ubuntu0.16.04.34+esm4"
},
{
"binary_name": "libnss-winbind",
"binary_version": "2:4.3.11+dfsg-0ubuntu0.16.04.34+esm4"
},
{
"binary_name": "libpam-winbind",
"binary_version": "2:4.3.11+dfsg-0ubuntu0.16.04.34+esm4"
},
{
"binary_name": "libparse-pidl-perl",
"binary_version": "2:4.3.11+dfsg-0ubuntu0.16.04.34+esm4"
},
{
"binary_name": "libsmbclient",
"binary_version": "2:4.3.11+dfsg-0ubuntu0.16.04.34+esm4"
},
{
"binary_name": "libwbclient0",
"binary_version": "2:4.3.11+dfsg-0ubuntu0.16.04.34+esm4"
},
{
"binary_name": "python-samba",
"binary_version": "2:4.3.11+dfsg-0ubuntu0.16.04.34+esm4"
},
{
"binary_name": "registry-tools",
"binary_version": "2:4.3.11+dfsg-0ubuntu0.16.04.34+esm4"
},
{
"binary_name": "samba",
"binary_version": "2:4.3.11+dfsg-0ubuntu0.16.04.34+esm4"
},
{
"binary_name": "samba-common",
"binary_version": "2:4.3.11+dfsg-0ubuntu0.16.04.34+esm4"
},
{
"binary_name": "samba-common-bin",
"binary_version": "2:4.3.11+dfsg-0ubuntu0.16.04.34+esm4"
},
{
"binary_name": "samba-dsdb-modules",
"binary_version": "2:4.3.11+dfsg-0ubuntu0.16.04.34+esm4"
},
{
"binary_name": "samba-libs",
"binary_version": "2:4.3.11+dfsg-0ubuntu0.16.04.34+esm4"
},
{
"binary_name": "samba-testsuite",
"binary_version": "2:4.3.11+dfsg-0ubuntu0.16.04.34+esm4"
},
{
"binary_name": "samba-vfs-modules",
"binary_version": "2:4.3.11+dfsg-0ubuntu0.16.04.34+esm4"
},
{
"binary_name": "smbclient",
"binary_version": "2:4.3.11+dfsg-0ubuntu0.16.04.34+esm4"
},
{
"binary_name": "winbind",
"binary_version": "2:4.3.11+dfsg-0ubuntu0.16.04.34+esm4"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:16.04:LTS",
"name": "samba",
"purl": "pkg:deb/ubuntu/samba@2:4.3.11+dfsg-0ubuntu0.16.04.34+esm4?arch=source\u0026distro=esm-infra/xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2:4.1.17+dfsg-4ubuntu2",
"2:4.1.20+dfsg-1ubuntu1",
"2:4.1.20+dfsg-1ubuntu2",
"2:4.1.20+dfsg-1ubuntu3",
"2:4.1.20+dfsg-1ubuntu5",
"2:4.3.3+dfsg-1ubuntu1",
"2:4.3.3+dfsg-1ubuntu2",
"2:4.3.3+dfsg-1ubuntu3",
"2:4.3.6+dfsg-1ubuntu1",
"2:4.3.8+dfsg-0ubuntu1",
"2:4.3.9+dfsg-0ubuntu0.16.04.1",
"2:4.3.9+dfsg-0ubuntu0.16.04.2",
"2:4.3.9+dfsg-0ubuntu0.16.04.3",
"2:4.3.11+dfsg-0ubuntu0.16.04.1",
"2:4.3.11+dfsg-0ubuntu0.16.04.3",
"2:4.3.11+dfsg-0ubuntu0.16.04.5",
"2:4.3.11+dfsg-0ubuntu0.16.04.6",
"2:4.3.11+dfsg-0ubuntu0.16.04.7",
"2:4.3.11+dfsg-0ubuntu0.16.04.8",
"2:4.3.11+dfsg-0ubuntu0.16.04.9",
"2:4.3.11+dfsg-0ubuntu0.16.04.10",
"2:4.3.11+dfsg-0ubuntu0.16.04.11",
"2:4.3.11+dfsg-0ubuntu0.16.04.12",
"2:4.3.11+dfsg-0ubuntu0.16.04.13",
"2:4.3.11+dfsg-0ubuntu0.16.04.15",
"2:4.3.11+dfsg-0ubuntu0.16.04.16",
"2:4.3.11+dfsg-0ubuntu0.16.04.17",
"2:4.3.11+dfsg-0ubuntu0.16.04.18",
"2:4.3.11+dfsg-0ubuntu0.16.04.19",
"2:4.3.11+dfsg-0ubuntu0.16.04.20",
"2:4.3.11+dfsg-0ubuntu0.16.04.21",
"2:4.3.11+dfsg-0ubuntu0.16.04.23",
"2:4.3.11+dfsg-0ubuntu0.16.04.24",
"2:4.3.11+dfsg-0ubuntu0.16.04.25",
"2:4.3.11+dfsg-0ubuntu0.16.04.26",
"2:4.3.11+dfsg-0ubuntu0.16.04.27",
"2:4.3.11+dfsg-0ubuntu0.16.04.28",
"2:4.3.11+dfsg-0ubuntu0.16.04.29",
"2:4.3.11+dfsg-0ubuntu0.16.04.30",
"2:4.3.11+dfsg-0ubuntu0.16.04.31",
"2:4.3.11+dfsg-0ubuntu0.16.04.32",
"2:4.3.11+dfsg-0ubuntu0.16.04.34",
"2:4.3.11+dfsg-0ubuntu0.16.04.34+esm1",
"2:4.3.11+dfsg-0ubuntu0.16.04.34+esm2",
"2:4.3.11+dfsg-0ubuntu0.16.04.34+esm3",
"2:4.3.11+dfsg-0ubuntu0.16.04.34+esm4"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "ctdb",
"binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.29+esm3"
},
{
"binary_name": "libnss-winbind",
"binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.29+esm3"
},
{
"binary_name": "libpam-winbind",
"binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.29+esm3"
},
{
"binary_name": "libparse-pidl-perl",
"binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.29+esm3"
},
{
"binary_name": "libsmbclient",
"binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.29+esm3"
},
{
"binary_name": "libwbclient0",
"binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.29+esm3"
},
{
"binary_name": "python-samba",
"binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.29+esm3"
},
{
"binary_name": "registry-tools",
"binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.29+esm3"
},
{
"binary_name": "samba",
"binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.29+esm3"
},
{
"binary_name": "samba-common",
"binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.29+esm3"
},
{
"binary_name": "samba-common-bin",
"binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.29+esm3"
},
{
"binary_name": "samba-dsdb-modules",
"binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.29+esm3"
},
{
"binary_name": "samba-libs",
"binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.29+esm3"
},
{
"binary_name": "samba-testsuite",
"binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.29+esm3"
},
{
"binary_name": "samba-vfs-modules",
"binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.29+esm3"
},
{
"binary_name": "smbclient",
"binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.29+esm3"
},
{
"binary_name": "winbind",
"binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.29+esm3"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:18.04:LTS",
"name": "samba",
"purl": "pkg:deb/ubuntu/samba@2:4.7.6+dfsg~ubuntu-0ubuntu2.29+esm3?arch=source\u0026distro=esm-infra/bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2:4.6.7+dfsg-1ubuntu3",
"2:4.7.1+dfsg-1ubuntu1",
"2:4.7.3+dfsg-1ubuntu1",
"2:4.7.4+dfsg-1ubuntu1",
"2:4.7.6+dfsg~ubuntu-0ubuntu1",
"2:4.7.6+dfsg~ubuntu-0ubuntu2",
"2:4.7.6+dfsg~ubuntu-0ubuntu2.2",
"2:4.7.6+dfsg~ubuntu-0ubuntu2.4",
"2:4.7.6+dfsg~ubuntu-0ubuntu2.5",
"2:4.7.6+dfsg~ubuntu-0ubuntu2.6",
"2:4.7.6+dfsg~ubuntu-0ubuntu2.7",
"2:4.7.6+dfsg~ubuntu-0ubuntu2.9",
"2:4.7.6+dfsg~ubuntu-0ubuntu2.10",
"2:4.7.6+dfsg~ubuntu-0ubuntu2.11",
"2:4.7.6+dfsg~ubuntu-0ubuntu2.13",
"2:4.7.6+dfsg~ubuntu-0ubuntu2.14",
"2:4.7.6+dfsg~ubuntu-0ubuntu2.15",
"2:4.7.6+dfsg~ubuntu-0ubuntu2.16",
"2:4.7.6+dfsg~ubuntu-0ubuntu2.17",
"2:4.7.6+dfsg~ubuntu-0ubuntu2.18",
"2:4.7.6+dfsg~ubuntu-0ubuntu2.19",
"2:4.7.6+dfsg~ubuntu-0ubuntu2.20",
"2:4.7.6+dfsg~ubuntu-0ubuntu2.21",
"2:4.7.6+dfsg~ubuntu-0ubuntu2.23",
"2:4.7.6+dfsg~ubuntu-0ubuntu2.24",
"2:4.7.6+dfsg~ubuntu-0ubuntu2.26",
"2:4.7.6+dfsg~ubuntu-0ubuntu2.27",
"2:4.7.6+dfsg~ubuntu-0ubuntu2.28",
"2:4.7.6+dfsg~ubuntu-0ubuntu2.29",
"2:4.7.6+dfsg~ubuntu-0ubuntu2.29+esm1",
"2:4.7.6+dfsg~ubuntu-0ubuntu2.29+esm2",
"2:4.7.6+dfsg~ubuntu-0ubuntu2.29+esm3"
]
},
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "ctdb",
"binary_version": "2:4.13.17~dfsg-0ubuntu0.21.04.1"
},
{
"binary_name": "libnss-winbind",
"binary_version": "2:4.13.17~dfsg-0ubuntu0.21.04.1"
},
{
"binary_name": "libpam-winbind",
"binary_version": "2:4.13.17~dfsg-0ubuntu0.21.04.1"
},
{
"binary_name": "libsmbclient",
"binary_version": "2:4.13.17~dfsg-0ubuntu0.21.04.1"
},
{
"binary_name": "libwbclient0",
"binary_version": "2:4.13.17~dfsg-0ubuntu0.21.04.1"
},
{
"binary_name": "python3-samba",
"binary_version": "2:4.13.17~dfsg-0ubuntu0.21.04.1"
},
{
"binary_name": "registry-tools",
"binary_version": "2:4.13.17~dfsg-0ubuntu0.21.04.1"
},
{
"binary_name": "samba",
"binary_version": "2:4.13.17~dfsg-0ubuntu0.21.04.1"
},
{
"binary_name": "samba-common",
"binary_version": "2:4.13.17~dfsg-0ubuntu0.21.04.1"
},
{
"binary_name": "samba-common-bin",
"binary_version": "2:4.13.17~dfsg-0ubuntu0.21.04.1"
},
{
"binary_name": "samba-dsdb-modules",
"binary_version": "2:4.13.17~dfsg-0ubuntu0.21.04.1"
},
{
"binary_name": "samba-libs",
"binary_version": "2:4.13.17~dfsg-0ubuntu0.21.04.1"
},
{
"binary_name": "samba-testsuite",
"binary_version": "2:4.13.17~dfsg-0ubuntu0.21.04.1"
},
{
"binary_name": "samba-vfs-modules",
"binary_version": "2:4.13.17~dfsg-0ubuntu0.21.04.1"
},
{
"binary_name": "smbclient",
"binary_version": "2:4.13.17~dfsg-0ubuntu0.21.04.1"
},
{
"binary_name": "winbind",
"binary_version": "2:4.13.17~dfsg-0ubuntu0.21.04.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:20.04:LTS",
"name": "samba",
"purl": "pkg:deb/ubuntu/samba@2:4.13.17~dfsg-0ubuntu0.21.04.1?arch=source\u0026distro=focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2:4.13.17~dfsg-0ubuntu0.21.04.1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2:4.10.7+dfsg-0ubuntu2",
"2:4.10.7+dfsg-0ubuntu3",
"2:4.11.1+dfsg-3ubuntu1",
"2:4.11.1+dfsg-3ubuntu2",
"2:4.11.1+dfsg-3ubuntu4",
"2:4.11.5+dfsg-1ubuntu1",
"2:4.11.5+dfsg-1ubuntu2",
"2:4.11.6+dfsg-0ubuntu1",
"2:4.11.6+dfsg-0ubuntu1.1",
"2:4.11.6+dfsg-0ubuntu1.2",
"2:4.11.6+dfsg-0ubuntu1.3",
"2:4.11.6+dfsg-0ubuntu1.4",
"2:4.11.6+dfsg-0ubuntu1.5",
"2:4.11.6+dfsg-0ubuntu1.6",
"2:4.11.6+dfsg-0ubuntu1.8",
"2:4.11.6+dfsg-0ubuntu1.9",
"2:4.11.6+dfsg-0ubuntu1.10",
"2:4.13.14+dfsg-0ubuntu0.20.04.1",
"2:4.13.14+dfsg-0ubuntu0.20.04.2",
"2:4.13.14+dfsg-0ubuntu0.20.04.3",
"2:4.13.14+dfsg-0ubuntu0.20.04.4"
]
}
],
"aliases": [],
"details": "All versions of Samba prior to 4.13.16 are vulnerable to a malicious client using an SMB1 or NFS race to allow a directory to be created in an area of the server file system not exported under the share definition. Note that SMB1 has to be enabled, or the share also available via NFS in order for this attack to succeed.",
"id": "UBUNTU-CVE-2021-43566",
"modified": "2026-04-22T07:40:11Z",
"published": "2022-01-11T16:15:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2021-43566"
},
{
"type": "REPORT",
"url": "https://www.samba.org/samba/security/CVE-2021-43566.html"
},
{
"type": "REPORT",
"url": "https://www.samba.org/samba/history/"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-5260-1"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2021-43566"
}
],
"related": [
"USN-5260-1"
],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N",
"type": "CVSS_V3"
},
{
"score": "low",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2021-43566"
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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