CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
AI Score
Confidence
High
EPSS
Percentile
46.4%
A vulnerability was discovered in Samba, where the flaw allows SMB clients to truncate files, even with read-only permissions when the Samba VFS module “acl_xattr” is configured with “acl_xattr:ignore system acls = yes”. The SMB protocol allows opening files when the client requests read-only access but then implicitly truncates the opened file to 0 bytes if the client specifies a separate OVERWRITE create disposition request. The issue arises in configurations that bypass kernel file system permissions checks, relying solely on Samba’s permissions.
[
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"product": "Red Hat Enterprise Linux 8",
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"packageName": "samba",
"defaultStatus": "affected",
"versions": [
{
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"lessThan": "*",
"versionType": "rpm",
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}
],
"cpes": [
"cpe:/a:redhat:enterprise_linux:8::appstream",
"cpe:/o:redhat:enterprise_linux:8::baseos",
"cpe:/a:redhat:enterprise_linux:8::crb"
]
},
{
"vendor": "Red Hat",
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"packageName": "samba",
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{
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"lessThan": "*",
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}
],
"cpes": [
"cpe:/a:redhat:enterprise_linux:8::appstream",
"cpe:/o:redhat:enterprise_linux:8::baseos",
"cpe:/a:redhat:enterprise_linux:8::crb"
]
},
{
"vendor": "Red Hat",
"product": "Red Hat Enterprise Linux 8.6 Extended Update Support",
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"packageName": "samba",
"defaultStatus": "affected",
"versions": [
{
"version": "0:4.15.5-13.el8_6",
"lessThan": "*",
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}
],
"cpes": [
"cpe:/a:redhat:rhel_eus:8.6::appstream",
"cpe:/o:redhat:rhev_hypervisor:4.4::el8",
"cpe:/o:redhat:rhel_eus:8.6::baseos",
"cpe:/a:redhat:rhel_eus:8.6::crb"
]
},
{
"vendor": "Red Hat",
"product": "Red Hat Enterprise Linux 8.8 Extended Update Support",
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"packageName": "samba",
"defaultStatus": "affected",
"versions": [
{
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}
],
"cpes": [
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},
{
"vendor": "Red Hat",
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"packageName": "samba",
"defaultStatus": "affected",
"versions": [
{
"version": "0:4.18.6-101.el9_3",
"lessThan": "*",
"versionType": "rpm",
"status": "unaffected"
}
],
"cpes": [
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"cpe:/o:redhat:enterprise_linux:9::baseos",
"cpe:/a:redhat:enterprise_linux:9::resilientstorage",
"cpe:/a:redhat:enterprise_linux:9::appstream"
]
},
{
"vendor": "Red Hat",
"product": "Red Hat Enterprise Linux 9",
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"packageName": "samba",
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"lessThan": "*",
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],
"cpes": [
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"cpe:/a:redhat:enterprise_linux:9::resilientstorage",
"cpe:/a:redhat:enterprise_linux:9::appstream"
]
},
{
"vendor": "Red Hat",
"product": "Red Hat Enterprise Linux 9.0 Extended Update Support",
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"packageName": "samba",
"defaultStatus": "affected",
"versions": [
{
"version": "0:4.15.5-111.el9_0",
"lessThan": "*",
"versionType": "rpm",
"status": "unaffected"
}
],
"cpes": [
"cpe:/a:redhat:rhel_eus:9.0::appstream",
"cpe:/a:redhat:rhel_eus:9.0::crb",
"cpe:/a:redhat:rhel_eus:9.0::resilientstorage",
"cpe:/o:redhat:rhel_eus:9.0::baseos"
]
},
{
"vendor": "Red Hat",
"product": "Red Hat Enterprise Linux 9.2 Extended Update Support",
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
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"versions": [
{
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"lessThan": "*",
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"status": "unaffected"
}
],
"cpes": [
"cpe:/a:redhat:rhel_eus:9.2::resilientstorage",
"cpe:/a:redhat:rhel_eus:9.2::crb",
"cpe:/a:redhat:rhel_eus:9.2::appstream",
"cpe:/o:redhat:rhel_eus:9.2::baseos"
]
},
{
"vendor": "Red Hat",
"product": "Red Hat Virtualization 4 for Red Hat Enterprise Linux 8",
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"packageName": "samba",
"defaultStatus": "affected",
"versions": [
{
"version": "0:4.15.5-13.el8_6",
"lessThan": "*",
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"status": "unaffected"
}
],
"cpes": [
"cpe:/a:redhat:rhel_eus:8.6::appstream",
"cpe:/o:redhat:rhev_hypervisor:4.4::el8",
"cpe:/o:redhat:rhel_eus:8.6::baseos",
"cpe:/a:redhat:rhel_eus:8.6::crb"
]
},
{
"vendor": "Red Hat",
"product": "Red Hat Enterprise Linux 6",
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"packageName": "samba",
"defaultStatus": "unknown",
"cpes": [
"cpe:/o:redhat:enterprise_linux:6"
]
},
{
"vendor": "Red Hat",
"product": "Red Hat Enterprise Linux 6",
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"packageName": "samba4",
"defaultStatus": "unknown",
"cpes": [
"cpe:/o:redhat:enterprise_linux:6"
]
},
{
"vendor": "Red Hat",
"product": "Red Hat Enterprise Linux 7",
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"packageName": "samba",
"defaultStatus": "unknown",
"cpes": [
"cpe:/o:redhat:enterprise_linux:7"
]
},
{
"vendor": "Red Hat",
"product": "Red Hat Storage 3",
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"packageName": "samba",
"defaultStatus": "affected",
"cpes": [
"cpe:/a:redhat:storage:3"
]
}
]
access.redhat.com/errata/RHSA-2023:6209
access.redhat.com/errata/RHSA-2023:6744
access.redhat.com/errata/RHSA-2023:7371
access.redhat.com/errata/RHSA-2023:7408
access.redhat.com/errata/RHSA-2023:7464
access.redhat.com/errata/RHSA-2023:7467
access.redhat.com/security/cve/CVE-2023-4091
bugzilla.redhat.com/show_bug.cgi?id=2241882
bugzilla.samba.org/show_bug.cgi?id=15439
www.samba.org/samba/security/CVE-2023-4091.html
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
AI Score
Confidence
High
EPSS
Percentile
46.4%