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Samba CVE-2023-4091: CVE-2023-3961, CVE-2023-4091, CVE-2023-4154, CVE-2023-42669, and CVE-2023-42670. Please see announcements for details.

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Samba CVE-2023-4091: CVE-2023-3961, CVE-2023-4091, CVE-2023-4154, CVE-2023-42669, and CVE-2023-42670. Please see announcements for details.

Severity
4
CVSS
(AV:L/AC:M/Au:N/C:P/I:P/A:P)
Published
10/13/2023
Created
10/13/2023
Added
10/13/2023
Modified
11/15/2023

Description

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.

Solution(s)

  • samba-upgrade-4_17_12
  • samba-upgrade-4_18_8
  • samba-upgrade-4_19_1

References

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