| Package | Affected versions | Patched versions |
|---|---|---|
| storage | = 3.0 | |
| samba | ≥ 4.18.0, < 4.18.8≥ 4.19.0, < 4.19.1< 4.17.12 | 4.18.84.19.14.17.12 |
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.
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