usn-4559-1
Vulnerability from osv_ubuntu
Published
2020-09-30 13:44
Modified
2026-04-22 07:36
Summary
samba update
Details
Tom Tervoort discovered that the Netlogon protocol implemented by Samba incorrectly handled the authentication scheme. A remote attacker could use this issue to forge an authentication token and steal the credentials of the domain admin.
While a previous security update fixed the issue by changing the "server schannel" setting to default to "yes", instead of "auto", which forced a secure netlogon channel, this update provides additional improvements.
For compatibility reasons with older devices, Samba now allows specifying an insecure netlogon configuration per machine. See the following link for examples: https://www.samba.org/samba/security/CVE-2020-1472.html
In addition, this update adds additional server checks for the protocol attack in the client-specified challenge to provide some protection when 'server schannel = no/auto' and avoid the false-positive results when running the proof-of-concept exploit.
References
| URL | Type | |
|---|---|---|
{
"affected": [
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2020-1472",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:16.04:LTS"
}
},
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "ctdb",
"binary_version": "2:4.3.11+dfsg-0ubuntu0.16.04.31"
},
{
"binary_name": "libnss-winbind",
"binary_version": "2:4.3.11+dfsg-0ubuntu0.16.04.31"
},
{
"binary_name": "libpam-winbind",
"binary_version": "2:4.3.11+dfsg-0ubuntu0.16.04.31"
},
{
"binary_name": "libparse-pidl-perl",
"binary_version": "2:4.3.11+dfsg-0ubuntu0.16.04.31"
},
{
"binary_name": "libsmbclient",
"binary_version": "2:4.3.11+dfsg-0ubuntu0.16.04.31"
},
{
"binary_name": "libwbclient0",
"binary_version": "2:4.3.11+dfsg-0ubuntu0.16.04.31"
},
{
"binary_name": "python-samba",
"binary_version": "2:4.3.11+dfsg-0ubuntu0.16.04.31"
},
{
"binary_name": "registry-tools",
"binary_version": "2:4.3.11+dfsg-0ubuntu0.16.04.31"
},
{
"binary_name": "samba",
"binary_version": "2:4.3.11+dfsg-0ubuntu0.16.04.31"
},
{
"binary_name": "samba-common",
"binary_version": "2:4.3.11+dfsg-0ubuntu0.16.04.31"
},
{
"binary_name": "samba-common-bin",
"binary_version": "2:4.3.11+dfsg-0ubuntu0.16.04.31"
},
{
"binary_name": "samba-dsdb-modules",
"binary_version": "2:4.3.11+dfsg-0ubuntu0.16.04.31"
},
{
"binary_name": "samba-libs",
"binary_version": "2:4.3.11+dfsg-0ubuntu0.16.04.31"
},
{
"binary_name": "samba-testsuite",
"binary_version": "2:4.3.11+dfsg-0ubuntu0.16.04.31"
},
{
"binary_name": "samba-vfs-modules",
"binary_version": "2:4.3.11+dfsg-0ubuntu0.16.04.31"
},
{
"binary_name": "smbclient",
"binary_version": "2:4.3.11+dfsg-0ubuntu0.16.04.31"
},
{
"binary_name": "winbind",
"binary_version": "2:4.3.11+dfsg-0ubuntu0.16.04.31"
}
]
},
"package": {
"ecosystem": "Ubuntu:16.04:LTS",
"name": "samba",
"purl": "pkg:deb/ubuntu/samba@2:4.3.11+dfsg-0ubuntu0.16.04.31?arch=source\u0026distro=xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2:4.3.11+dfsg-0ubuntu0.16.04.31"
}
],
"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"
]
},
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2020-1472",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:18.04:LTS"
}
},
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "ctdb",
"binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.20"
},
{
"binary_name": "libnss-winbind",
"binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.20"
},
{
"binary_name": "libpam-winbind",
"binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.20"
},
{
"binary_name": "libparse-pidl-perl",
"binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.20"
},
{
"binary_name": "libsmbclient",
"binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.20"
},
{
"binary_name": "libwbclient0",
"binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.20"
},
{
"binary_name": "python-samba",
"binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.20"
},
{
"binary_name": "registry-tools",
"binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.20"
},
{
"binary_name": "samba",
"binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.20"
},
{
"binary_name": "samba-common",
"binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.20"
},
{
"binary_name": "samba-common-bin",
"binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.20"
},
{
"binary_name": "samba-dsdb-modules",
"binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.20"
},
{
"binary_name": "samba-libs",
"binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.20"
},
{
"binary_name": "samba-testsuite",
"binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.20"
},
{
"binary_name": "samba-vfs-modules",
"binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.20"
},
{
"binary_name": "smbclient",
"binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.20"
},
{
"binary_name": "winbind",
"binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.20"
}
]
},
"package": {
"ecosystem": "Ubuntu:18.04:LTS",
"name": "samba",
"purl": "pkg:deb/ubuntu/samba@2:4.7.6+dfsg~ubuntu-0ubuntu2.20?arch=source\u0026distro=bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2:4.7.6+dfsg~ubuntu-0ubuntu2.20"
}
],
"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"
]
},
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2020-1472",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:20.04:LTS"
}
},
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "ctdb",
"binary_version": "2:4.11.6+dfsg-0ubuntu1.5"
},
{
"binary_name": "libnss-winbind",
"binary_version": "2:4.11.6+dfsg-0ubuntu1.5"
},
{
"binary_name": "libpam-winbind",
"binary_version": "2:4.11.6+dfsg-0ubuntu1.5"
},
{
"binary_name": "libsmbclient",
"binary_version": "2:4.11.6+dfsg-0ubuntu1.5"
},
{
"binary_name": "libwbclient0",
"binary_version": "2:4.11.6+dfsg-0ubuntu1.5"
},
{
"binary_name": "python3-samba",
"binary_version": "2:4.11.6+dfsg-0ubuntu1.5"
},
{
"binary_name": "registry-tools",
"binary_version": "2:4.11.6+dfsg-0ubuntu1.5"
},
{
"binary_name": "samba",
"binary_version": "2:4.11.6+dfsg-0ubuntu1.5"
},
{
"binary_name": "samba-common",
"binary_version": "2:4.11.6+dfsg-0ubuntu1.5"
},
{
"binary_name": "samba-common-bin",
"binary_version": "2:4.11.6+dfsg-0ubuntu1.5"
},
{
"binary_name": "samba-dsdb-modules",
"binary_version": "2:4.11.6+dfsg-0ubuntu1.5"
},
{
"binary_name": "samba-libs",
"binary_version": "2:4.11.6+dfsg-0ubuntu1.5"
},
{
"binary_name": "samba-testsuite",
"binary_version": "2:4.11.6+dfsg-0ubuntu1.5"
},
{
"binary_name": "samba-vfs-modules",
"binary_version": "2:4.11.6+dfsg-0ubuntu1.5"
},
{
"binary_name": "smbclient",
"binary_version": "2:4.11.6+dfsg-0ubuntu1.5"
},
{
"binary_name": "winbind",
"binary_version": "2:4.11.6+dfsg-0ubuntu1.5"
}
]
},
"package": {
"ecosystem": "Ubuntu:20.04:LTS",
"name": "samba",
"purl": "pkg:deb/ubuntu/samba@2:4.11.6+dfsg-0ubuntu1.5?arch=source\u0026distro=focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2:4.11.6+dfsg-0ubuntu1.5"
}
],
"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"
]
}
],
"aliases": [],
"details": "Tom Tervoort discovered that the Netlogon protocol implemented by Samba\nincorrectly handled the authentication scheme. A remote attacker could use\nthis issue to forge an authentication token and steal the credentials of\nthe domain admin.\n\nWhile a previous security update fixed the issue by changing the \"server\nschannel\" setting to default to \"yes\", instead of \"auto\", which forced a\nsecure netlogon channel, this update provides additional improvements.\n\nFor compatibility reasons with older devices, Samba now allows specifying\nan insecure netlogon configuration per machine. See the following link for\nexamples: https://www.samba.org/samba/security/CVE-2020-1472.html\n\nIn addition, this update adds additional server checks for the protocol\nattack in the client-specified challenge to provide some protection when\n\u0027server schannel = no/auto\u0027 and avoid the false-positive results when\nrunning the proof-of-concept exploit.\n",
"id": "USN-4559-1",
"modified": "2026-04-22T07:36:58Z",
"published": "2020-09-30T13:44:33Z",
"references": [
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-4559-1"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2020-1472"
}
],
"related": [],
"schema_version": "1.7.0",
"summary": "samba update",
"upstream": [
"UBUNTU-CVE-2020-1472"
]
}
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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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