vulnerability
Samba CVE-2023-4091: CVE-2023-3961, CVE-2023-4091, CVE-2023-4154, CVE-2023-42669, and CVE-2023-42670. Please see announcements for details.
| Severity | CVSS | Published | Added | Modified |
|---|---|---|---|---|
| 7 | (AV:N/AC:L/Au:S/C:N/I:C/A:N) | 2023-10-13 | 2023-10-13 | 2025-01-30 |
Severity
7
CVSS
(AV:N/AC:L/Au:S/C:N/I:C/A:N)
Published
2023-10-13
Added
2023-10-13
Modified
2025-01-30
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.
Solution(s)
samba-upgrade-4_17_12samba-upgrade-4_18_8samba-upgrade-4_19_1
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