CVE-2023-4091
MEDIUM
MEDIUM
Priority: 0.09
BB Relevance:
63/100
Published: 2023-11-03
Modified: 2026-11-07
First seen: 2026-11-07
Status: active
Attack Surface
Network
Low Complexity
No Interaction
Integ. Impact
CVSS Vector Breakdown
AV:
Network
AC:
Low
PR:
Low
UI:
None
S:
Unchanged
C:
None
I:
High
A:
None
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.
Weakness Classification (1)
Affected Software (5)
| Vendor | Product | Version |
|---|---|---|
| fedoraproject | fedora | 39 |
| redhat | enterprise_linux | 8.0 |
| redhat | enterprise_linux_eus | 9.0 |
| redhat | storage | 3.0 |
| samba | samba | < 4.17.12 |
References & Advisories (13)
vendor-advisory
x_refsource_REDHAT
vendor-advisory
x_refsource_REDHAT
vendor-advisory
x_refsource_REDHAT
vendor-advisory
x_refsource_REDHAT
vendor-advisory
x_refsource_REDHAT
vendor-advisory
x_refsource_REDHAT
vdb-entry
x_refsource_REDHAT
issue-tracking
x_refsource_REDHAT