Samba < 4.17.12 / 4.18.x < 4.18.8 / 4.19.x < 4.19.1 Incorrect Permissions Handling

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##

include('compat.inc');

if (description)
{
  script_id(183023);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/11/14");

  script_cve_id("CVE-2023-4091");
  script_xref(name:"IAVA", value:"2023-A-0535");

  script_name(english:"Samba < 4.17.12 / 4.18.x < 4.18.8 / 4.19.x < 4.19.1 Incorrect Permissions Handling");

  script_set_attribute(attribute:"synopsis", value:
"The remote Samba server is potentially affected by a vulnerability.");
  script_set_attribute(attribute:"description", value:
"The version of Samba running on the remote host is potentially affected by a vulnerability. The SMB protocol allows
opening files where the client requests read-only access, but then implicitly truncating the opened file if the client
specifies a separate OVERWRITE create disposition. This operation requires write access to the file, and in the
default Samba configuration the operating system kernel will deny access to open a read-only file for read/write (which
the truncate operation requires). However, when Samba has been configured to ignore kernel file system permissions,
Samba will truncate a file when the underlying operating system kernel would deny the operation.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version
number.");
  script_set_attribute(attribute:"see_also", value:"https://www.samba.org/samba/security/CVE-2023-4091.html");
  script_set_attribute(attribute:"see_also", value:"https://www.samba.org/samba/history/security.html");
  script_set_attribute(attribute:"solution", value:
"Upgrade to Samba version 4.17.12, 4.18.8, or 4.19.1.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/C:N/I:C/A:N");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2023-4091");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"vuln_publication_date", value:"2023/10/10");
  script_set_attribute(attribute:"patch_publication_date", value:"2023/10/10");
  script_set_attribute(attribute:"plugin_publication_date", value:"2023/10/13");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:samba:samba");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Misc.");

  script_copyright(english:"This script is Copyright (C) 2023 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("smb_nativelanman.nasl");
  script_require_keys("SMB/NativeLanManager", "SMB/samba");

  exit(0);
}

include('vcf.inc');
include('vcf_extras.inc');

var app_info = vcf::samba::get_app_info();

vcf::check_granularity(app_info:app_info, sig_segments:3);

var constraints = [
  {'min_version':'0.0',  'fixed_version':'4.17.12'},
  {'min_version':'4.18',  'fixed_version':'4.18.8'},
  {'min_version':'4.19',  'fixed_version':'4.19.1'}
];

vcf::check_version_and_report(
  app_info: app_info,
  constraints: constraints,
  require_paranoia: TRUE, # Require paranoia due to backporting concerns
  severity: SECURITY_WARNING
);