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Amazon Linux AMI: CVE-2023-4091: Security patch for samba (ALAS-2023-1896)

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Amazon Linux AMI: CVE-2023-4091: Security patch for samba (ALAS-2023-1896)

Severity
4
CVSS
(AV:L/AC:M/Au:N/C:P/I:P/A:P)
Published
11/03/2023
Created
12/07/2023
Added
12/05/2023
Modified
12/05/2023

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)

  • amazon-linux-upgrade-samba

References

  • ALAS-2023-1896
  • CVE-2023-4091

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