Incorrect Default Permissions Affecting samba-tool package, versions <4.15.13+git.691.3d3cea0641-150400.3.31.1


Severity

Recommended
0.0
medium
0
10

Based on SUSE Linux Enterprise Server security rating.

Threat Intelligence

EPSS
1.33% (71st percentile)

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  • Snyk IDSNYK-SLES154-SAMBATOOL-5962522
  • published13 Oct 2023
  • disclosed12 Oct 2023

Introduced: 12 Oct 2023

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

How to fix?

Upgrade SLES:15.4 samba-tool to version 4.15.13+git.691.3d3cea0641-150400.3.31.1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream samba-tool package and not the samba-tool package as distributed by SLES. See How to fix? for SLES:15.4 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