VDB
ALPINE-CVE-2023-4091
ALPINE-CVE-2023-4091
PUBLISHED
CVSS 6.5 MEDIUM
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.
Risk Scores
CVSS 3.1
6.5
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Alpine:v3.21 | samba | 4.8.8-r0, 4.8.7-r0, 4.8.5-r0 |
| Alpine:v3.19 | samba | 0, 4.8.8-r0, 4.8.7-r0 |
| Alpine:v3.20 | samba | 4.18.1-r1, 0, 3.2.10-r0 |
| Alpine:v3.23 | samba | 3.5.8-r0, 3.2.11-r1, 0 |
| Alpine:v3.18 | samba | 4.8.8-r0, 4.8.7-r0, 4.8.5-r0 |
| Alpine:v3.22 | samba | 3.4.5-r1, 3.3.7-r2, 0 |
Timeline
- Nov 3, 2023 CVE Published
- Dec 3, 2025 CVE Updated
- Apr 30, 2026 Distribution Patch