RHSA-2022:0133
Vulnerability from csaf_redhat - Published: 2022-01-12 14:41 - Updated: 2025-11-21 18:27Summary
Red Hat Security Advisory: Red Hat Virtualization Host security and bug fix update [ovirt-4.4.9] Async #2
Severity
Important
Notes
Topic: An update for redhat-release-virtualization-host and redhat-virtualization-host is now available for Red Hat Virtualization 4 for Red Hat Enterprise Linux 8.
Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details: The redhat-virtualization-host packages provide the Red Hat Virtualization Host. These packages include redhat-release-virtualization-host, ovirt-node, and rhev-hypervisor. Red Hat Virtualization Hosts (RHVH) are installed using a special build of Red Hat Enterprise Linux with only the packages required to host virtual machines. RHVH features a Cockpit user interface for monitoring the host's resources and performing administrative tasks.
Security Fix(es):
* samba: Active Directory (AD) domain user could become root on domain members (CVE-2020-25717)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
A flaw was found in the way Samba maps domain users to local users. An authenticated attacker could use this flaw to cause possible privilege escalation.
8.1 (High)
Vendor Fix
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://access.redhat.com/articles/2974891
https://access.redhat.com/errata/RHSA-2022:0133
Workaround
Setting "gensec:require_pac=true" in the smb.conf makes, due to a cache prime in winbind, the DOMAIN\user lookup succeed, provided nss_winbind is in use, 'winbind use default domain = no' (the default) and no error paths are hit.
It would be prudent to pre-create disabled users in Active Directory matching on all privileged names not held in Active Directory, eg
~~~
samba-tool user add root -H ldap://$SERVER -U$USERNAME%$PASSWORD --random-password
samba-tool user add ubuntu -H ldap://$SERVER -U$USERNAME%$PASSWORD --random-password
~~~
(repeat for eg all system users under 1000 in /etc/passwd or special to any other AD-connected services, eg perhaps "admin" for a web-app)
References
Acknowledgments
the Samba project
Catalyst and the Samba Team
Andrew Bartlett
{
"document": {
"aggregate_severity": {
"namespace": "https://access.redhat.com/security/updates/classification/",
"text": "Important"
},
"category": "csaf_security_advisory",
"csaf_version": "2.0",
"distribution": {
"text": "Copyright \u00a9 Red Hat, Inc. All rights reserved.",
"tlp": {
"label": "WHITE",
"url": "https://www.first.org/tlp/"
}
},
"lang": "en",
"notes": [
{
"category": "summary",
"text": "An update for redhat-release-virtualization-host and redhat-virtualization-host is now available for Red Hat Virtualization 4 for Red Hat Enterprise Linux 8.\n\nRed Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.",
"title": "Topic"
},
{
"category": "general",
"text": "The redhat-virtualization-host packages provide the Red Hat Virtualization Host. These packages include redhat-release-virtualization-host, ovirt-node, and rhev-hypervisor. Red Hat Virtualization Hosts (RHVH) are installed using a special build of Red Hat Enterprise Linux with only the packages required to host virtual machines. RHVH features a Cockpit user interface for monitoring the host\u0027s resources and performing administrative tasks.\n\nSecurity Fix(es):\n\n* samba: Active Directory (AD) domain user could become root on domain members (CVE-2020-25717)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.",
"title": "Details"
},
{
"category": "legal_disclaimer",
"text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.",
"title": "Terms of Use"
}
],
"publisher": {
"category": "vendor",
"contact_details": "https://access.redhat.com/security/team/contact/",
"issuing_authority": "Red Hat Product Security is responsible for vulnerability handling across all Red Hat products and services.",
"name": "Red Hat Product Security",
"namespace": "https://www.redhat.com"
},
"references": [
{
"category": "self",
"summary": "https://access.redhat.com/errata/RHSA-2022:0133",
"url": "https://access.redhat.com/errata/RHSA-2022:0133"
},
{
"category": "external",
"summary": "https://access.redhat.com/security/updates/classification/#important",
"url": "https://access.redhat.com/security/updates/classification/#important"
},
{
"category": "external",
"summary": "2019672",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2019672"
},
{
"category": "external",
"summary": "2037758",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2037758"
},
{
"category": "self",
"summary": "Canonical URL",
"url": "https://security.access.redhat.com/data/csaf/v2/advisories/2022/rhsa-2022_0133.json"
}
],
"title": "Red Hat Security Advisory: Red Hat Virtualization Host security and bug fix update [ovirt-4.4.9] Async #2",
"tracking": {
"current_release_date": "2025-11-21T18:27:50+00:00",
"generator": {
"date": "2025-11-21T18:27:50+00:00",
"engine": {
"name": "Red Hat SDEngine",
"version": "4.6.12"
}
},
"id": "RHSA-2022:0133",
"initial_release_date": "2022-01-12T14:41:12+00:00",
"revision_history": [
{
"date": "2022-01-12T14:41:12+00:00",
"number": "1",
"summary": "Initial version"
},
{
"date": "2022-01-12T14:41:12+00:00",
"number": "2",
"summary": "Last updated version"
},
{
"date": "2025-11-21T18:27:50+00:00",
"number": "3",
"summary": "Last generated version"
}
],
"status": "final",
"version": "3"
}
},
"product_tree": {
"branches": [
{
"branches": [
{
"branches": [
{
"category": "product_name",
"name": "RHEL 8-based RHEV-H for RHEV 4 (build requirements)",
"product": {
"name": "RHEL 8-based RHEV-H for RHEV 4 (build requirements)",
"product_id": "8Base-RHV-HypervisorBuild-4",
"product_identification_helper": {
"cpe": "cpe:/o:redhat:rhev_hypervisor:4.4::el8"
}
}
},
{
"category": "product_name",
"name": "Red Hat Virtualization 4 Hypervisor for RHEL 8",
"product": {
"name": "Red Hat Virtualization 4 Hypervisor for RHEL 8",
"product_id": "8Base-RHV-Hypervisor-4",
"product_identification_helper": {
"cpe": "cpe:/o:redhat:rhev_hypervisor:4.4::el8"
}
}
}
],
"category": "product_family",
"name": "Red Hat Virtualization"
},
{
"branches": [
{
"category": "product_version",
"name": "redhat-release-virtualization-host-0:4.4.9-4.el8ev.src",
"product": {
"name": "redhat-release-virtualization-host-0:4.4.9-4.el8ev.src",
"product_id": "redhat-release-virtualization-host-0:4.4.9-4.el8ev.src",
"product_identification_helper": {
"purl": "pkg:rpm/redhat/redhat-release-virtualization-host@4.4.9-4.el8ev?arch=src"
}
}
},
{
"category": "product_version",
"name": "redhat-virtualization-host-0:4.4.9-202201072228_8.5.src",
"product": {
"name": "redhat-virtualization-host-0:4.4.9-202201072228_8.5.src",
"product_id": "redhat-virtualization-host-0:4.4.9-202201072228_8.5.src",
"product_identification_helper": {
"purl": "pkg:rpm/redhat/redhat-virtualization-host@4.4.9-202201072228_8.5?arch=src"
}
}
}
],
"category": "architecture",
"name": "src"
},
{
"branches": [
{
"category": "product_version",
"name": "redhat-release-virtualization-host-0:4.4.9-4.el8ev.x86_64",
"product": {
"name": "redhat-release-virtualization-host-0:4.4.9-4.el8ev.x86_64",
"product_id": "redhat-release-virtualization-host-0:4.4.9-4.el8ev.x86_64",
"product_identification_helper": {
"purl": "pkg:rpm/redhat/redhat-release-virtualization-host@4.4.9-4.el8ev?arch=x86_64"
}
}
},
{
"category": "product_version",
"name": "redhat-release-virtualization-host-content-0:4.4.9-4.el8ev.x86_64",
"product": {
"name": "redhat-release-virtualization-host-content-0:4.4.9-4.el8ev.x86_64",
"product_id": "redhat-release-virtualization-host-content-0:4.4.9-4.el8ev.x86_64",
"product_identification_helper": {
"purl": "pkg:rpm/redhat/redhat-release-virtualization-host-content@4.4.9-4.el8ev?arch=x86_64"
}
}
},
{
"category": "product_version",
"name": "redhat-virtualization-host-image-update-0:4.4.9-202201072228_8.5.x86_64",
"product": {
"name": "redhat-virtualization-host-image-update-0:4.4.9-202201072228_8.5.x86_64",
"product_id": "redhat-virtualization-host-image-update-0:4.4.9-202201072228_8.5.x86_64",
"product_identification_helper": {
"purl": "pkg:rpm/redhat/redhat-virtualization-host-image-update@4.4.9-202201072228_8.5?arch=x86_64"
}
}
}
],
"category": "architecture",
"name": "x86_64"
},
{
"branches": [
{
"category": "product_version",
"name": "redhat-virtualization-host-image-update-placeholder-0:4.4.9-4.el8ev.noarch",
"product": {
"name": "redhat-virtualization-host-image-update-placeholder-0:4.4.9-4.el8ev.noarch",
"product_id": "redhat-virtualization-host-image-update-placeholder-0:4.4.9-4.el8ev.noarch",
"product_identification_helper": {
"purl": "pkg:rpm/redhat/redhat-virtualization-host-image-update-placeholder@4.4.9-4.el8ev?arch=noarch"
}
}
}
],
"category": "architecture",
"name": "noarch"
}
],
"category": "vendor",
"name": "Red Hat"
}
],
"relationships": [
{
"category": "default_component_of",
"full_product_name": {
"name": "redhat-virtualization-host-0:4.4.9-202201072228_8.5.src as a component of Red Hat Virtualization 4 Hypervisor for RHEL 8",
"product_id": "8Base-RHV-Hypervisor-4:redhat-virtualization-host-0:4.4.9-202201072228_8.5.src"
},
"product_reference": "redhat-virtualization-host-0:4.4.9-202201072228_8.5.src",
"relates_to_product_reference": "8Base-RHV-Hypervisor-4"
},
{
"category": "default_component_of",
"full_product_name": {
"name": "redhat-virtualization-host-image-update-0:4.4.9-202201072228_8.5.x86_64 as a component of Red Hat Virtualization 4 Hypervisor for RHEL 8",
"product_id": "8Base-RHV-Hypervisor-4:redhat-virtualization-host-image-update-0:4.4.9-202201072228_8.5.x86_64"
},
"product_reference": "redhat-virtualization-host-image-update-0:4.4.9-202201072228_8.5.x86_64",
"relates_to_product_reference": "8Base-RHV-Hypervisor-4"
},
{
"category": "default_component_of",
"full_product_name": {
"name": "redhat-release-virtualization-host-0:4.4.9-4.el8ev.src as a component of RHEL 8-based RHEV-H for RHEV 4 (build requirements)",
"product_id": "8Base-RHV-HypervisorBuild-4:redhat-release-virtualization-host-0:4.4.9-4.el8ev.src"
},
"product_reference": "redhat-release-virtualization-host-0:4.4.9-4.el8ev.src",
"relates_to_product_reference": "8Base-RHV-HypervisorBuild-4"
},
{
"category": "default_component_of",
"full_product_name": {
"name": "redhat-release-virtualization-host-0:4.4.9-4.el8ev.x86_64 as a component of RHEL 8-based RHEV-H for RHEV 4 (build requirements)",
"product_id": "8Base-RHV-HypervisorBuild-4:redhat-release-virtualization-host-0:4.4.9-4.el8ev.x86_64"
},
"product_reference": "redhat-release-virtualization-host-0:4.4.9-4.el8ev.x86_64",
"relates_to_product_reference": "8Base-RHV-HypervisorBuild-4"
},
{
"category": "default_component_of",
"full_product_name": {
"name": "redhat-release-virtualization-host-content-0:4.4.9-4.el8ev.x86_64 as a component of RHEL 8-based RHEV-H for RHEV 4 (build requirements)",
"product_id": "8Base-RHV-HypervisorBuild-4:redhat-release-virtualization-host-content-0:4.4.9-4.el8ev.x86_64"
},
"product_reference": "redhat-release-virtualization-host-content-0:4.4.9-4.el8ev.x86_64",
"relates_to_product_reference": "8Base-RHV-HypervisorBuild-4"
},
{
"category": "default_component_of",
"full_product_name": {
"name": "redhat-virtualization-host-image-update-placeholder-0:4.4.9-4.el8ev.noarch as a component of RHEL 8-based RHEV-H for RHEV 4 (build requirements)",
"product_id": "8Base-RHV-HypervisorBuild-4:redhat-virtualization-host-image-update-placeholder-0:4.4.9-4.el8ev.noarch"
},
"product_reference": "redhat-virtualization-host-image-update-placeholder-0:4.4.9-4.el8ev.noarch",
"relates_to_product_reference": "8Base-RHV-HypervisorBuild-4"
}
]
},
"vulnerabilities": [
{
"acknowledgments": [
{
"names": [
"the Samba project"
]
},
{
"names": [
"Andrew Bartlett"
],
"organization": "Catalyst and the Samba Team"
}
],
"cve": "CVE-2020-25717",
"cwe": {
"id": "CWE-20",
"name": "Improper Input Validation"
},
"discovery_date": "2021-11-03T00:00:00+00:00",
"flags": [
{
"label": "vulnerable_code_not_present",
"product_ids": [
"8Base-RHV-HypervisorBuild-4:redhat-release-virtualization-host-0:4.4.9-4.el8ev.src",
"8Base-RHV-HypervisorBuild-4:redhat-release-virtualization-host-0:4.4.9-4.el8ev.x86_64",
"8Base-RHV-HypervisorBuild-4:redhat-release-virtualization-host-content-0:4.4.9-4.el8ev.x86_64",
"8Base-RHV-HypervisorBuild-4:redhat-virtualization-host-image-update-placeholder-0:4.4.9-4.el8ev.noarch"
]
}
],
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2019672"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in the way Samba maps domain users to local users. An authenticated attacker could use this flaw to cause possible privilege escalation.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "samba: Active Directory (AD) domain user could become root on domain members",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
"product_status": {
"fixed": [
"8Base-RHV-Hypervisor-4:redhat-virtualization-host-0:4.4.9-202201072228_8.5.src",
"8Base-RHV-Hypervisor-4:redhat-virtualization-host-image-update-0:4.4.9-202201072228_8.5.x86_64"
],
"known_not_affected": [
"8Base-RHV-HypervisorBuild-4:redhat-release-virtualization-host-0:4.4.9-4.el8ev.src",
"8Base-RHV-HypervisorBuild-4:redhat-release-virtualization-host-0:4.4.9-4.el8ev.x86_64",
"8Base-RHV-HypervisorBuild-4:redhat-release-virtualization-host-content-0:4.4.9-4.el8ev.x86_64",
"8Base-RHV-HypervisorBuild-4:redhat-virtualization-host-image-update-placeholder-0:4.4.9-4.el8ev.noarch"
]
},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2020-25717"
},
{
"category": "external",
"summary": "RHBZ#2019672",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2019672"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2020-25717",
"url": "https://www.cve.org/CVERecord?id=CVE-2020-25717"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2020-25717",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2020-25717"
},
{
"category": "external",
"summary": "https://www.samba.org/samba/security/CVE-2020-25717.html",
"url": "https://www.samba.org/samba/security/CVE-2020-25717.html"
}
],
"release_date": "2021-11-09T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2022-01-12T14:41:12+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/2974891",
"product_ids": [
"8Base-RHV-Hypervisor-4:redhat-virtualization-host-0:4.4.9-202201072228_8.5.src",
"8Base-RHV-Hypervisor-4:redhat-virtualization-host-image-update-0:4.4.9-202201072228_8.5.x86_64"
],
"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2022:0133"
},
{
"category": "workaround",
"details": "Setting \"gensec:require_pac=true\" in the smb.conf makes, due to a cache prime in winbind, the DOMAIN\\user lookup succeed, provided nss_winbind is in use, \u0027winbind use default domain = no\u0027 (the default) and no error paths are hit. \n\nIt would be prudent to pre-create disabled users in Active Directory matching on all privileged names not held in Active Directory, eg \n~~~\n samba-tool user add root -H ldap://$SERVER -U$USERNAME%$PASSWORD --random-password\n samba-tool user add ubuntu -H ldap://$SERVER -U$USERNAME%$PASSWORD --random-password\n ~~~\n (repeat for eg all system users under 1000 in /etc/passwd or special to any other AD-connected services, eg perhaps \"admin\" for a web-app)",
"product_ids": [
"8Base-RHV-Hypervisor-4:redhat-virtualization-host-0:4.4.9-202201072228_8.5.src",
"8Base-RHV-Hypervisor-4:redhat-virtualization-host-image-update-0:4.4.9-202201072228_8.5.x86_64",
"8Base-RHV-HypervisorBuild-4:redhat-release-virtualization-host-0:4.4.9-4.el8ev.src",
"8Base-RHV-HypervisorBuild-4:redhat-release-virtualization-host-0:4.4.9-4.el8ev.x86_64",
"8Base-RHV-HypervisorBuild-4:redhat-release-virtualization-host-content-0:4.4.9-4.el8ev.x86_64",
"8Base-RHV-HypervisorBuild-4:redhat-virtualization-host-image-update-placeholder-0:4.4.9-4.el8ev.noarch"
]
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 8.1,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N",
"version": "3.1"
},
"products": [
"8Base-RHV-Hypervisor-4:redhat-virtualization-host-0:4.4.9-202201072228_8.5.src",
"8Base-RHV-Hypervisor-4:redhat-virtualization-host-image-update-0:4.4.9-202201072228_8.5.x86_64",
"8Base-RHV-HypervisorBuild-4:redhat-release-virtualization-host-0:4.4.9-4.el8ev.src",
"8Base-RHV-HypervisorBuild-4:redhat-release-virtualization-host-0:4.4.9-4.el8ev.x86_64",
"8Base-RHV-HypervisorBuild-4:redhat-release-virtualization-host-content-0:4.4.9-4.el8ev.x86_64",
"8Base-RHV-HypervisorBuild-4:redhat-virtualization-host-image-update-placeholder-0:4.4.9-4.el8ev.noarch"
]
}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "samba: Active Directory (AD) domain user could become root on domain members"
}
]
}
Loading…
Loading…
Sightings
| Author | Source | Type | Date |
|---|
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.
Loading…
Loading…