Incorrect Default Permissions Affecting samba-winbind package, versions <4.15.13+git.691.3d3cea0641-150300.3.63.1


Severity

Recommended
0.0
medium
0
10

Based on SUSE Linux Enterprise Server security rating.

Threat Intelligence

EPSS
1.17% (64th percentile)

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  • Snyk IDSNYK-SLES153-SAMBAWINBIND-6003739
  • published18 Oct 2023
  • disclosed17 Oct 2023

Introduced: 17 Oct 2023

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

How to fix?

Upgrade SLES:15.3 samba-winbind to version 4.15.13+git.691.3d3cea0641-150300.3.63.1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream samba-winbind package and not the samba-winbind package as distributed by SLES. See How to fix? for SLES:15.3 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 Base Scores

version 3.1