CVE ID:	CVE-2023-4091
Description:	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.
Test IDs:	1.3.6.1.4.1.25623.1.1.2.2024.1021   1.3.6.1.4.1.25623.1.0.104957   1.3.6.1.4.1.25623.1.1.2.2023.3349   1.3.6.1.4.1.25623.1.1.2.2024.1391   1.3.6.1.4.1.25623.1.1.2.2024.1073   1.3.6.1.4.1.25623.1.1.2.2024.1370   1.3.6.1.4.1.25623.1.1.2.2023.3317   1.3.6.1.4.1.25623.1.1.2.2024.1297   1.3.6.1.4.1.25623.1.1.2.2024.1097   1.3.6.1.4.1.25623.1.1.4.2023.4040.1   1.3.6.1.4.1.25623.1.1.2.2024.1047   1.3.6.1.4.1.25623.1.1.2.2024.1704
Cross References:	Common Vulnerability Exposure (CVE) ID: CVE-2023-4091 RHBZ#2241882 https://bugzilla.redhat.com/show_bug.cgi?id=2241882 RHSA-2023:6209 https://access.redhat.com/errata/RHSA-2023:6209 RHSA-2023:6744 https://access.redhat.com/errata/RHSA-2023:6744 RHSA-2023:7371 https://access.redhat.com/errata/RHSA-2023:7371 RHSA-2023:7408 https://access.redhat.com/errata/RHSA-2023:7408 RHSA-2023:7464 https://access.redhat.com/errata/RHSA-2023:7464 RHSA-2023:7467 https://access.redhat.com/errata/RHSA-2023:7467 https://access.redhat.com/security/cve/CVE-2023-4091 https://access.redhat.com/security/cve/CVE-2023-4091 https://bugzilla.samba.org/show_bug.cgi?id=15439 https://bugzilla.samba.org/show_bug.cgi?id=15439 https://lists.debian.org/debian-lts-announce/2024/04/msg00015.html https://lists.debian.org/debian-lts-announce/2024/04/msg00015.html https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZUMVALLFFDFC53JZMUWA6HPD7HUGAP5I/ https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZUMVALLFFDFC53JZMUWA6HPD7HUGAP5I/ https://security.netapp.com/advisory/ntap-20231124-0002/ https://security.netapp.com/advisory/ntap-20231124-0002/ https://www.samba.org/samba/security/CVE-2023-4091.html https://www.samba.org/samba/security/CVE-2023-4091.html