Incorrect Default Permissions Affecting samba package, versions <2:4.9.5+dfsg-5+deb10u5


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
0.16% (54th percentile)

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  • Snyk IDSNYK-DEBIAN10-SAMBA-5954695
  • published11 Oct 2023
  • disclosed3 Nov 2023

Introduced: 11 Oct 2023

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

How to fix?

Upgrade Debian:10 samba to version 2:4.9.5+dfsg-5+deb10u5 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream samba package and not the samba package as distributed by Debian. See How to fix? for Debian:10 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