Xen Project DoS Vulnerability (XSA-359)

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

include('compat.inc');

if (description)
{
  script_id(144452);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/06/03");

  script_cve_id("CVE-2020-29571");
  script_xref(name:"IAVB", value:"2020-B-0077-S");

  script_name(english:"Xen Project DoS Vulnerability (XSA-359)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Xen hypervisor installation is missing a security update.");
  script_set_attribute(attribute:"description", value:
"According to its self-reported version number, the Xen hypervisor installed on the remote host is affected by a denial
 of service vulnerability due to the de-referencing of a NULL pointer. Only ARM systems are affected.

Note that Nessus has checked the changeset versions based on the xen.git change log. Nessus did not check guest 
hardware configurations or if patches were applied manually to the source code before a recompile and reinstall.");
  script_set_attribute(attribute:"see_also", value:"https://xenbits.xen.org/xsa/advisory-359.html");
  script_set_attribute(attribute:"see_also", value:"https://xenbits.xen.org/gitweb/?p=xen.git;a=summary");
  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:N/I:N/A:C");
  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:N/UI:N/S:U/C:N/I:N/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2020-29571");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2020/12/15");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/12/15");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/12/18");

  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:"II");
  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('vcf.inc');
include('vcf_extras.inc');

app = 'Xen Hypervisor';
 
app_info = vcf::xen_hypervisor::get_app_info(app:app);

if (report_paranoia < 2) audit(AUDIT_PARANOID);

# generated by the tools xen_changesets script
fixes['4.10']['fixed_ver']           = '4.10.4';
fixes['4.10']['fixed_ver_display']   = '4.10.4 (changeset 6ea37c6)';
fixes['4.10']['affected_ver_regex']  = "^4\.10\.";
fixes['4.10']['affected_changesets'] = make_list('136ac88', 'cbc06ee',
  'fef52f1', '7073b82', '3056f89', '12569ab', '17b26b8', '66e2db1', 
  'fcc17dc', 'e644edc', '7e16a0e', 'a4c2c94', 'bdd36b6', '59dc712', 
  '57a55a4', '12937f9', 'f06e4ac', '3658044', '9edd614', '8cb4d2d', 
  '2fee46c', '06092d1', '77d6b2b', 'a043a64', '3afd384', 'e8231b6', 
  '1d72d99', '8eb5328', 'f79f47f', 'f91d2a9', '1fdcfdb', '17ec9b4', 
  '15b2980', '398f91c', '5114e77', '7a4ec79', '78d912e', '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', 
  '388e312', '0b0a155', '9df4399', 'fd57128', 'a9bda69', 'a380168', 
  'c1a4914', '6261a06', 'fd6e49e', 'bd20589', 'ce05683', '934d6e1', 
  '6e636f2', 'dfc0b23', '2f83654', 'bf467cc', '6df4d40', 'e20bb58', 
  'a1a9b05', 'afca67f', 'b922c44', 'b413732', '3d60912', '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', '7212f9a', 
  '6d1659d', 'a782173', '24e90db', '0824bc6', 'e6f3135', '3131bf9');

fixes['4.11']['fixed_ver']           = '4.11.4';
fixes['4.11']['fixed_ver_display']   = '4.11.4 (changeset 310ab79)';
fixes['4.11']['affected_ver_regex']  = "^4\.11\.";
fixes['4.11']['affected_changesets'] = make_list('2d49825', '24f7d12',
  'f1f3dee', '1e87058', '4cc2387', '4053771', 'b3f4121', 'e36f81f', 
  '1124a45', '7791d2e', '5724431', '495e973', '771a105', 'b3f80a3', 
  '966f266', '57261ac', '1b7ed67', '0a6bbf9', '6be47ee', '2fe5a55', 
  '36621b7', '88f6ff5', '170445f', '551287f', '0297770', 'd2b6bf9', 
  '41a822c', '8ab4af9', '4fe1326', '4438fc1', '2a730d5', '62aed78', 
  '1447d44', '3b5de11', '65fad0a', 'b5eb495', 'e274c8b', '1d021db', 
  '63199df', '7739ffd', '4f35f7f', '490c517', '7912bbe', 'f5ec9f2', 
  'ad7d040', '3630a36', '3263f25', '3e565a9', '30b3f29', '3def846', 
  'cc1561a', '6e9de08', '13f60bf', '9712a2f', '7284bfa', '2fe163d', 
  '2121bd3', '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 2186c16)';
fixes['4.12']['affected_ver_regex']  = "^4\.12\.";
fixes['4.12']['affected_changesets'] = make_list('51e9505', '4943ea7',
  '3c13a87', 'd4b884b', '7da9325', 'd6d3b13', '9fe89e1', 'd009b8d', 
  '674108e', 'bfda5ae', '551d75d', '5e1bac4', 'f8443e8', '655190d', 
  'f860f42', '9f73020', 'aeebc0c', 'f1a4126', 'b1efedb', '4739f79', 
  '0dbcdcc', '444b717', '544a775', 'c64ff3b', '8145d38', '14f577b', 
  '40ab019', '1dd870e', '5c15a1c', '6602544', '14c9c0f', 'dee5d47', 
  '7b2f479', '46ad884', 'eaafa72', '0e6975b', '8e0c2a2', '51eca39', 
  '7ae2afb', '5e11fd5', '34056b2', 'fd4cc0b', '4f9294d', '97b7b55');

fixes['4.14']['fixed_ver']           = '4.14.1';
fixes['4.14']['fixed_ver_display']   = '4.14.1-pre (changeset d17a5d5)';
fixes['4.14']['affected_ver_regex']  = "^4\.14\.";
fixes['4.14']['affected_changesets'] = make_list('9872981', 'd785e07',
  'd8f08a4', '5174e42', 'bfc99c3', '13268c5', 'de822c4', '57bbcd0', 
  '7214cc7', '49ed711', 'dc871dd', 'b1c5e40', '61d3863', '9e53440', 
  '335ef5b', '6fa3e05', 'f4405b6', '228e562', '0a79a1b', '5073c6b', 
  '5259358', '3d0e1a1', '117521e', '91992c7', '4e298fa', '3beffb3', 
  'da67712', '9c898a8', 'f130d5f', '1d1d1f5', '72bd989', '8e6c236', 
  '1cfb9b1', '7c6ee4e', 'd11d977', '1ad1773', '0057b1f', 'd101b41', 
  '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', '12019c2', '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');

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