Xen: x86/AMD: Mismatch in IOMMU Quarantine Page Table Levels (XSA-445)

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

include('compat.inc');

if (description)
{
  script_id(186416);
  script_version("1.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/01/15");

  script_cve_id("CVE-2023-46835");
  script_xref(name:"IAVB", value:"2023-B-0090");

  script_name(english:"Xen: x86/AMD: Mismatch in IOMMU Quarantine Page Table Levels (XSA-445)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Xen hypervisor installation is missing a security update.");
  script_set_attribute(attribute:"description", value:
"The current setup of quarantine page tables assumes that there are 4 page table levels, however the AMD-Vi IOMMU is
configured with 3 page table levels for systems without RAM above the 512 GB boundary. Due to this level mismatch,
the sink page the device gets read/write access to is no longer cleared between device assignment, possibly leading to
data leaks.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
  script_set_attribute(attribute:"see_also", value:"https://xenbits.xen.org/xsa/advisory-445.html");
  script_set_attribute(attribute:"solution", value:
"Apply the appropriate patch according to the vendor advisory.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:S/C:C/I:N/A:N");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/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-2023-46835");

  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:"2023/11/14");
  script_set_attribute(attribute:"patch_publication_date", value:"2023/11/14");
  script_set_attribute(attribute:"plugin_publication_date", value:"2023/11/29");

  script_set_attribute(attribute:"potential_vulnerability", value:"true");
  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:xen:xen");
  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) 2023-2024 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("xen_server_detect.nbin");
  script_require_keys("installed_sw/Xen Hypervisor", "Settings/ParanoidReport");

  exit(0);
}

include('vcf_extras.inc');

var fixes;
var app = 'Xen Hypervisor';
var app_info = vcf::xen_hypervisor::get_app_info(app:app);
if (report_paranoia < 2) audit(AUDIT_PARANOID);

fixes['4.15']['fixed_ver']           = '4.15.5';
fixes['4.15']['fixed_ver_display']   = '4.15.5 (changeset 1f5f515)';
fixes['4.15']['affected_ver_regex']  = "^4\.15([^0-9]|$)";
fixes['4.15']['affected_changesets'] = make_list('4a4daf6', '1f0d217',
  'c844124', '75aa1c9', '9a502b6', '3ab7e4a', '609b76c', '844bcf0',
  'ff2ba13', '586aab2', '964840a', '8c1075d', '60aed4c', '1b8dbe4',
  '0a70ce9', '3a9a290', 'd7b7804', 'b007f82', 'dac9060', 'd39e5cf',
  'd75cb6d', '93504b3', '67b9743', '806893a', '094cd5c', 'db3386e',
  '0517763', 'da7f151');

fixes['4.16']['fixed_ver']           = '4.16.5';
fixes['4.16']['fixed_ver_display']   = '4.16.5 (changeset 6fea383)';
fixes['4.16']['affected_ver_regex']  = "^4\.16([^0-9]|$)";
fixes['4.16']['affected_changesets'] = make_list('29efce0', '3c22a9b',
  'a157b71', '5182683', '1395852', 'c1159b5', 'd01f651', '4f46a07',
  '3d760a3', '7661261', '2de503f', '7d520b8', 'd51a2a1', '35217b7',
  '3382512', 'c450a4b', 'de751c3', 'a5857f1', '3e51782', '8064cbd',
  '19aca8f', '6cc49c3', '353e876', 'afa5b17', '1e52cdf', '08539e8',
  'd720c23', 'b9ad687');

fixes['4.17']['fixed_ver']           = '4.17.3';
fixes['4.17']['fixed_ver_display']   = '4.17.3-pre (changeset b7a1e10)';
fixes['4.17']['affected_ver_regex']  = "^4\.17([^0-9]|$)";
fixes['4.17']['affected_changesets'] = make_list('0b56bed', '3f8b444',
  '46d00db', '42bf49d', 'f5e2116', '8ee1924', '3797742', 'e7059f1',
  '8a58412', 'eb4efda', '78143c5', 'f1cd620', 'd665c66', '0d8f9f7',
  'c4e05c9', '90c540c', '9ac2f49', '19ee1e1', '2e2c3ef', 'e4a71bc',
  '5f7efd4', 'ba023e9', '3952c73', '84690fb', 'dc28aba', 'd2d2dca',
  'd31e5b2', '699de51', '8be85d8', 'a939e95', '7ca58fb', '0429822',
  'ba360fb', '5116fe1', 'e08e733', '1bd4523', 'a885649', 'd0cdd34',
  'f04295d', 'e5f9987', '7b5155a', '052a8d2', 'f00d563', 'e418a77',
  '24487fe', 'ae1045c', '37f1d68', '476d262', 'a1f68fb', '36e84ea',
  '56076ef', '1c3927f', '8d84be5', '7d88979', '2f337a0');

vcf::xen_hypervisor::check_version_and_report(app_info:app_info, fixes:fixes, severity:SECURITY_WARNING);