Incorrect Default Permissions Affecting samba-vfs-iouring package, versions <0:4.18.6-2.el8_9


Severity

Recommended
0.0
medium
0
10

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.15% (52nd percentile)

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  • Snyk IDSNYK-RHEL8-SAMBAVFSIOURING-5959404
  • published11 Oct 2023
  • disclosed10 Oct 2023

Introduced: 10 Oct 2023

CVE-2023-4091  (opens in a new tab)
CWE-276  (opens in a new tab)

How to fix?

Upgrade RHEL:8 samba-vfs-iouring to version 0:4.18.6-2.el8_9 or higher.
This issue was patched in RHSA-2023:7467.

NVD Description

Note: Versions mentioned in the description apply only to the upstream samba-vfs-iouring package and not the samba-vfs-iouring package as distributed by RHEL. See How to fix? for RHEL:8 relevant fixed versions and status.

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 Scores

version 3.1