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Affected Component
Analysis
samba
Patched
Name
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.
Published Date
Updated Date
Workaround
-
Advisories
https://access.redhat.com/errata/RHSA-2023:6209Third Party Advisory
https://access.redhat.com/errata/RHSA-2023:6744Third Party Advisory
https://access.redhat.com/security/cve/CVE-2023-4091Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2241882Issue Tracking
https://bugzilla.samba.org/show_bug.cgi?id=15439Issue Tracking
https://www.samba.org/samba/security/CVE-2023-4091.htmlVendor Advisory
https://access.redhat.com/errata/RHSA-2023:6209Third Party Advisory
https://access.redhat.com/errata/RHSA-2023:6744Third Party Advisory
https://access.redhat.com/security/cve/CVE-2023-4091Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2241882Issue Tracking
https://bugzilla.samba.org/show_bug.cgi?id=15439Issue Tracking
https://www.samba.org/samba/security/CVE-2023-4091.htmlVendor Advisory
Analysis#
Vulnerability Ratings#
6.5
CVSSv31
6.5
CVSSv31
NaN
other
Others affected components#
Resolved with patches#
samba (yocto:kirkstone)
#
Title
Author
Resolve
1
CVE-2023-4091: smbd: use open_access_mask for access check in
Ralph Boehme <slow@samba.org>
CVE-2023-4091
2
CVE-2023-4091: smbtorture: test overwrite dispositions on
Ralph Boehme <slow@samba.org>
CVE-2023-4091