CVE-2023-4091
Assigner: redhat
Published: 2023-11-03T07:56:35.611Z
State: PUBLISHED
title: Samba: smb clients can truncate files with read-only permissions
metrics: other: content: value: Moderate
namespace: https://access.redhat.com/security/updates/classification/
type: Red Hat severity rating
cvssV3_1: attackComplexity: LOW
attackVector: NETWORK
availabilityImpact: NONE
baseScore: 6.5
baseSeverity: MEDIUM
confidentialityImpact: NONE
integrityImpact: HIGH
privilegesRequired: LOW
scope: UNCHANGED
userInteraction: NONE
vectorString: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
version: 3.1
format: CVSS
descriptions: value: 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.
affected: vendor: Red Hat
product: Red Hat Enterprise Linux 8
collectionURL: https://access.redhat.com/downloads/content/package-browser/
packageName: samba
defaultStatus: affected
versions: version: 0:4.18.6-2.el8_9
lessThan: *
versionType: rpm
status: unaffected
cpes: cpe:/a:redhat:enterprise_linux:8::appstream
cpe:/a:redhat:enterprise_linux:8::crb
cpe:/o:redhat:enterprise_linux:8::baseos
vendor: Red Hat
product: Red Hat Enterprise Linux 8
collectionURL: https://access.redhat.com/downloads/content/package-browser/
packageName: samba
defaultStatus: affected
versions: version: 0:4.18.6-2.el8_9
lessThan: *
versionType: rpm
status: unaffected
cpes: cpe:/a:redhat:enterprise_linux:8::appstream
cpe:/a:redhat:enterprise_linux:8::crb
cpe:/o:redhat:enterprise_linux:8::baseos
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: *
versionType: rpm
status: unaffected
cpes: cpe:/o:redhat:rhev_hypervisor:4.4::el8
cpe:/a:redhat:rhel_eus:8.6::appstream
cpe:/a:redhat:rhel_eus:8.6::crb
cpe:/o:redhat:rhel_eus:8.6::baseos
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: version: 0:4.17.5-4.el8_8
lessThan: *
versionType: rpm
status: unaffected
cpes: cpe:/a:redhat:rhel_eus:8.8::crb
cpe:/a:redhat:rhel_eus:8.8::appstream
cpe:/o:redhat:rhel_eus:8.8::baseos
vendor: Red Hat
product: Red Hat Enterprise Linux 9
collectionURL: https://access.redhat.com/downloads/content/package-browser/
packageName: samba
defaultStatus: affected
versions: version: 0:4.18.6-101.el9_3
lessThan: *
versionType: rpm
status: unaffected
cpes: cpe:/a:redhat:enterprise_linux:9::crb
cpe:/o:redhat:enterprise_linux:9::baseos
cpe:/a:redhat:enterprise_linux:9::appstream
cpe:/a:redhat:enterprise_linux:9::resilientstorage
vendor: Red Hat
product: Red Hat Enterprise Linux 9
collectionURL: https://access.redhat.com/downloads/content/package-browser/
packageName: samba
defaultStatus: affected
versions: version: 0:4.18.6-101.el9_3
lessThan: *
versionType: rpm
status: unaffected
cpes: cpe:/a:redhat:enterprise_linux:9::crb
cpe:/o:redhat:enterprise_linux:9::baseos
cpe:/a:redhat:enterprise_linux:9::appstream
cpe:/a:redhat:enterprise_linux:9::resilientstorage
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::crb
cpe:/a:redhat:rhel_eus:9.0::appstream
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/
packageName: samba
defaultStatus: affected
versions: version: 0:4.17.5-104.el9_2
lessThan: *
versionType: rpm
status: unaffected
cpes: cpe:/o:redhat:rhel_eus:9.2::baseos
cpe:/a:redhat:rhel_eus:9.2::appstream
cpe:/a:redhat:rhel_eus:9.2::resilientstorage
cpe:/a:redhat:rhel_eus:9.2::crb
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: *
versionType: rpm
status: unaffected
cpes: cpe:/o:redhat:rhev_hypervisor:4.4::el8
cpe:/a:redhat:rhel_eus:8.6::appstream
cpe:/a:redhat:rhel_eus:8.6::crb
cpe:/o:redhat:rhel_eus:8.6::baseos
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
datePublic: 2023-10-10T00:00:00+00:00
problemTypes: descriptions: cweId: CWE-276
description: Incorrect Default Permissions
type: CWE
x_redhatCweChain: CWE-276: Incorrect Default Permissions
workarounds: value: The vulnerability is most commonly associated with the "acl_xattr" module and can be mitigated by setting:
~~~
"acl_xattr:ignore system acls = no"
~~~
timeline: time: 2023-10-03T00:00:00+00:00
value: Reported to Red Hat.
time: 2023-10-10T00:00:00+00:00
value: Made public.