ALPINE-CVE-2023-4091

Advisory lineage Upstream: 1 Downstream: 0
Upstream
CVE-2023-4091
Published: 03 Nov 2023, 08:15
Last modified:08 Jul 2026, 04:31

Vulnerability Summary

Overall Risk (default)
medium
26/100
CVSS Score
6.5 MEDIUM
3.1 (osv_alpine)
EPSS Score
No data
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

03 Nov 2023, 08:15
Published
Vulnerability first disclosed
08 Jul 2026, 04:31
Last Modified
Vulnerability information updated

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.

CVSS Metrics

  • v3.1•MEDIUM•Score: 6.5CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Affected Systems

  • alpine•samba

    < 4.18.8-r0 | < 4.18.8-r0 | < 4.18.8-r0 | < 4.18.8-r0 | < 4.18.8-r0 | < 4.18.8-r0 | < 4.18.8-r0 | ≥ 4.18.0, < 4.18.8-r0 | ≥ 4.18.0, < 4.18.8-r0 | ≥ 4.18.0, < 4.18.8-r0 | ≥ 4.18.0, < 4.18.8-r0 | ≥ 4.18.0, < 4.18.8-r0 | ≥ 4.18.0, < 4.18.8-r0 | ≥ 4.18.0, < 4.18.8-r0

References (1)