Xen Platypus information leak via power sidechannel (XSA-351)

##
# (C) Tenable Network Security, Inc.
##

include('compat.inc');

if (description)
{
  script_id(142889);
  script_version("1.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/01/04");

  script_cve_id("CVE-2020-28368");
  script_xref(name:"IAVB", value:"2020-B-0066");

  script_name(english:"Xen Platypus information leak via power sidechannel (XSA-351)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Xen hypervisor installation is missing a security update.");
  script_set_attribute(attribute:"description", value:
"An information disclosure vulnerability exists in power/energy monitoring interfaces, which can be used to create
covert channels and infer the operations and data used by other contexts within the  system.");
  script_set_attribute(attribute:"see_also", value:"https://xenbits.xen.org/xsa/advisory-351.html");
  script_set_attribute(attribute:"see_also", value:"https://platypusattack.com/");
  # https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00389.html
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?4153ee20");
  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:N/C:P/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:H/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-2020-28368");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2020/11/10");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/11/10");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/11/13");

  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) 2020-2021 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('install_func.inc');

app_name = 'Xen Hypervisor';
install  = get_single_install(app_name:app_name);
if (report_paranoia < 2) audit(AUDIT_PARANOID);

version         = install['version'];
display_version = install['display_version'];
path            = install['path'];
managed_status  = install['Managed status'];
changeset       = install['Changeset'];

if (!empty_or_null(changeset))
  display_version += ' (changeset ' + changeset + ')';

# Installations that are vendor-managed are handled by OS-specific local package checks
if (managed_status == 'managed')
  audit(AUDIT_INST_PATH_NOT_VULN, app_name, display_version, path);

fixes['4.10']['fixed_ver']           = '4.10.4';
fixes['4.10']['fixed_ver_display']   = '4.10.4 (changeset 15b2980)';
fixes['4.10']['affected_ver_regex']  = "^4\.10\.";
fixes['4.10']['affected_changesets'] = make_list('398f91c', '5114e77',
  '7a4ec79', '78d903e', '2012db4', '71da63b', '56f8da7', 'd73e972', 
  '6f012ec', '75a05da', 'c334b87', '07ad8ff', '1719f79', 'f58caa4', 
  'f2befb6', '83b7f04', 'e081568', '7f0793a', '8fac37e', 'baf80b6', 
  '5402540', 'f85223f', '635ae12', '3d14937', '4218b74', '93be943', 
  '4418841', 'd9c67d3', '8976bab', '388e303', '0b0a155', '9df4399', 
  'fd57038', 'a9bda69', 'a380168', 'c1a4914', '6261a06', 'fd6e49e', 
  'bd20589', 'ce05683', '934d6e1', '6e636f2', 'dfc0b23', '2f83654', 
  'bf467cc', '6df4d40', 'e20bb58', 'a1a9b05', 'afca67f', 'b922c44', 
  'b413732', '3d60903', 'b01c84e', '1e722e6', '59cf3a0', 'fabfce8', 
  'a4dd2fe', '6e63a6f', '24d62e1', 'cbedabf', '38e589d', 'a91b8fc', 
  '3e0c316', '49a5d6e', '6cb1cb9', 'ba2776a', '9d143e8', 'fe8dab3', 
  '07e546e', 'fefa5f9', 'c9f9ff7', '406d40d', 'e489955', '37139f1', 
  'fde09cb', '804ba02', 'e8c3971', 'a8c4293', 'aa40452', '1da3dab', 
  'e5632c4', '902e72d', '6a14610', 'ea815b2', '13ad331', '61b75d9', 
  'e70e7bf', 'e966e2e', 'dfa16a1', 'a71e199', 'c98be9e', 'a548e10', 
  'd3c0e84', '53b1572', '7203f9a', '6d1659d', 'a782173', '24e90db', 
  '0824bc6', 'e6f3135', '3131bf9');

fixes['4.11']['fixed_ver']           = '4.11.4';
fixes['4.11']['fixed_ver_display']   = '4.11.4 (changeset 1447d44)';
fixes['4.11']['affected_ver_regex']  = "^4\.11\.";
fixes['4.11']['affected_changesets'] = make_list('3b5de11', '65fad0a',
  'b5eb495', 'e274c8b', '1d021db', '63199df', '7739ffd', '4f35f7f', 
  '490c517', '7912bbe', 'f5ec9f2', 'ad7d040', '3630a36', '3263f25', 
  '3e565a9', '30b3f29', '3def846', 'cc1561a', '6e9de08', '13f60bf', 
  '9703a2f', '7284bfa', '2fe163d', '2031bd3', '7bf4983', '7129b9e', 
  'ddaaccb', 'e6ddf4a', 'f2bc74c', 'd623658', '37c853a', '8bf72ea', 
  '2d11e6d', '4ed0007', '7def72c', '18be3aa', 'a3a392e', 'e96cdba', 
  '2b77729', '9be7992', 'b8d476a', '1c751c4', '7dd2ac3', 'a58bba2', 
  '7d8fa6a', '4777208', '48e8564', '2efca7e', 'afe82f5', 'e84b634', '96a8b5b');

fixes['4.12']['fixed_ver']           = '4.12.4';
fixes['4.12']['fixed_ver_display']   = '4.12.4 (changeset 14c9c0f)';
fixes['4.12']['affected_ver_regex']  = "^4\.12\.";
fixes['4.12']['affected_changesets'] = make_list('dee5d47', '7b2f479',
  '46ad884', 'eaafa72', '0e6975b', '8e0c2a2', '51eca39', '7ae2afb', 
  '5e11fd5', '34056b2', 'fd4cc0b', '4f9294d', '97b7b55');

fixes['4.13']['fixed_ver']           = '4.13.2';
fixes['4.13']['fixed_ver_display']   = '4.13.2 (changeset d4c0483)';
fixes['4.13']['affected_ver_regex']  = "^4\.13\.";
fixes['4.13']['affected_changesets'] = make_list('33483f8', '6434a63',
  '971a9d1', 'a92f935', 'a5756aa', '43edb26', 'd204083', 'e596bf7',
  'c64c15f', '1892cb9', '75c5799', 'b3b43ac', 'c0dc42a', '8311549', '0060ac2');

fixes['4.14']['fixed_ver']           = '4.14.1';
fixes['4.14']['fixed_ver_display']   = '4.14.1-pre (changeset d101b41)';
fixes['4.14']['affected_ver_regex']  = "^4\.14\.";
fixes['4.14']['affected_changesets'] = make_list('d95f450', '73a0927',
  'a38060e', '78a53f0', '89ae1b1', '7398a44', '59b8366', '1f9f1cb',
  'f728b2d', '71a12a9', '0c96e42', '29b48aa', 'd131310', '7d2b21f',
  'f61c5d0', 'fc8fab1', '898864c', '9f954ae', '5784d1e', '10bb63c',
  '941f69a', '7b1e587', 'ee47e8e', '4ba3fb0', 'd2ba323', 'b081a5f',
  'e936515', '9c1cc64', '829dbe2', '8d14800', '0521dc9', '64c3951',
  '0974e00', 'a279fcb', 'f7ab0c1', '7339975', '94c157f', '79f1701',
  '9e757fc', '809a70b', 'b427109', 'c93b520', 'f37a1cf', '5478934',
  '43eceee', '03019c2', '66cdf34', 'ecc6428', '2ee270e', '9b9fc8e',
  'b8c2efb', 'f546906', 'eb4a543', 'e417504', '0bc4177', '5ad3152',
  'fc8200a', '5eab5f0', 'b04d673', '28855eb', '174be04', '158c3bd',
  '3535f23', 'de7e543', '483b43c', '431d52a', 'ceafff7', '369e7a3',
  '98aa6ea', '80dec06', '5482c28', 'edf5b86', 'eca6d5e', 'c3a0fc2',
  '864d570', 'afed8e4', 'a5dab0a', 'b8c3e33', 'f836759');

fix = NULL;

var ver_branch, affected_changeset;

foreach ver_branch (keys(fixes))
{
  if (version =~ fixes[ver_branch]['affected_ver_regex'])
  {
    ret = ver_compare(ver:version, fix:fixes[ver_branch]['fixed_ver']);
    if (ret < 0)
      fix = fixes[ver_branch]['fixed_ver_display'];
    else if (ret == 0)
    {
      if (empty_or_null(changeset))
        fix = fixes[ver_branch]['fixed_ver_display'];
      else
        foreach affected_changeset (fixes[ver_branch]['affected_changesets'])
          if (changeset == affected_changeset)
            fix = fixes[ver_branch]['fixed_ver_display'];
    }
  }
}

if (empty_or_null(fix))
  audit(AUDIT_INST_PATH_NOT_VULN, app_name, display_version, path);

items  = make_array(
  'Installed version', display_version,
  'Fixed version', fix,
  'Path', path
);

order  = make_list('Path', 'Installed version', 'Fixed version');
report = report_items_str(report_items:items, ordered_fields:order) + '\n';

security_report_v4(port:0, extra:report, severity:SECURITY_NOTE);