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IP …
medium6.5

CVE-2023-4091

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_xa…

Impact

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.

Affected products

VendorProductAffected versions
SambaSamba
before 4.17.12
from 4.18.0 before 4.18.8
from 4.19.0 before 4.19.1
FedoraprojectFedora
Version 39
RedhatStorage
Version 3.0
RedhatEnterprise Linux
Version 8.0
RedhatEnterprise Linux Eus
Version 9.0

Weakness classification

CWE-276

References