Xen Project ARM Grant Table v2 DoS (XSA-268)

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

include("compat.inc");

if (description)
{
  script_id(112156);
  script_version("1.6");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/06/03");

  script_cve_id("CVE-2018-15469");
  script_xref(name:"IAVB", value:"2018-B-0111-S");

  script_name(english:"Xen Project ARM Grant Table v2 DoS (XSA-268)");
  script_summary(english:"Checks 'xl info' output for the Xen hypervisor version.");

  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.

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:"http://xenbits.xen.org/xsa/advisory-268.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:L/UI:N/S:C/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-2018-15469");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2018/08/14");
  script_set_attribute(attribute:"patch_publication_date", value:"2018/08/14");
  script_set_attribute(attribute:"plugin_publication_date", value:"2018/08/28");

  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) 2018-2021 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("audit.inc");
include("global_settings.inc");
include("install_func.inc");
include("misc_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['4.6']['fixed_ver']           = '4.6.6';
fixes['4.6']['fixed_ver_display']   = '4.6.6 (changeset 45f6a27)';
fixes['4.6']['affected_ver_regex']  = '^4\\.6\\.';
fixes['4.6']['affected_changesets'] = make_list("4c8d9f8", "1840f82",
  "a80ce17", "7d98594", "f30c9b6", "a1b8d86", "ff1d0b6", "3bd7cf6",
  "55c7bd6", "98d7948", "e0981f6", "91cf29f", "a0c3f80", "cf7d9d1",
  "170c48b", "c39cd00", "2d69b6d", "03ba272", "1fa0ecb", "598a375",
  "b7b7c4d", "ba7d011", "a544804", "2642b56", "03938ba", "542f711",
  "90dc163", "61a9fc5", "a671bd6", "365ecff", "237236a", "aa5a889",
  "3e3c11b", "8a2e1db", "cb0230a", "4336ffa", "3df7d47", "5ccba18",
  "991dd4c", "331a1af", "035c96f", "bfe8f3e", "4f0509d", "2f99d68",
  "0d3904f", "342a02f", "2d8e87e", "ac659af", "c1be09e", "e7b723b",
  "cd5232a", "f9f9634", "6981351", "12b9fca", "916ef0d", "055abe4",
  "c4333f5", "3d6970d", "a0db1f2", "6a74f4e", "5278a9a", "c53663a",
  "c5339c5", "3b96676", "2f3cde3", "acd8661", "5ddc3f8", "927aca7",
  "b4b553d", "b766574", "10898d7", "0b38930", "33f70b8", "cf03d32",
  "525c381", "4c1e2d3", "021009e", "4972c38", "bd461fc", "c9c1bb6",
  "0fbf30a", "7e20b9b", "d1618f4", "9d534c1", "dbb3553", "e54a8c6",
  "8005ed3", "9a852e0", "d779cc1", "c93bcf9", "15adcf3", "d7b8190",
  "2b1457f", "a357880", "ee23fcc", "5651015", "225e9c7", "3c70619",
  "1222333", "75bdd69", "8994cf3", "642c603", "c25ea9a", "feba571",
  "0163087", "44c2666", "db743b0", "41a5cce", "4e1b9e9", "4d21549",
  "ff4800c", "2613a1b", "8335c8a", "ab20c5c", "9089da9", "8edfc82",
  "af5b61a", "ec05090", "75263f7", "f7e273a", "03c7d2c", "9ce1a71",
  "a735c7a", "44ad7f6", "91dc902", "a065841", "c6e9e60", "f94c11d",
  "45ddc4e", "1ca93b7", "8c0c36e", "6e43623", "47d3e73", "ea80245",
  "37bb22b", "9b0c2a2", "8d3fe28", "be63d66", "9454e30", "aad5a67",
  "d8b0ebf", "f0208a4", "42b2c82", "57318e1", "9f22d72", "e0353b4",
  "76f1549", "9bac910", "c7a43e3", "913d4f8", "c5881c5", "b0239cd",
  "78fd0c3", "9079e0d", "1658a87", "22b6dfa", "a8cd231", "629eddd",
  "64c03bb", "b4660b4", "1ac8162", "747df3c", "5ae011e", "f974d32",
  "3300ad3", "d708b69");

fixes['4.7']['fixed_ver']           = '4.7.6';
fixes['4.7']['fixed_ver_display']   = '4.7.6 (changeset 3f7fd2b)';
fixes['4.7']['affected_ver_regex']  = '^4\\.7\\.';
fixes['4.7']['affected_changesets'] = make_list("bcbd8b9", "dfee811",
  "95ff4e1", "ded2a37", "87dba80", "fe028e6", "a51e6a3", "0e66281",
  "51d9780", "91ca84c", "bce2dd6", "fa807e2", "97aff08", "e90e243",
  "c0e854b", "9858a1f", "a404136", "dc111e9", "0873699", "280a556");

fixes['4.8']['fixed_ver']           = '4.8.5';
fixes['4.8']['fixed_ver_display']   = '4.8.5-pre (changeset 0406164)';
fixes['4.8']['affected_ver_regex']  = '^4\\.8\\.';
fixes['4.8']['affected_changesets'] = make_list("e3d0ce3", "c00fabc",
  "3478439", "b81b74a", "b289403", "47fbc6e", "ee7bcea", "df5bbf7",
  "d96893f", "15508b3", "790ed15", "d838957", "aa45015", "b149b06",
  "c117d09", "e343ee8", "5566272", "f049cd6", "6dc0bc5", "37a1b4a",
  "f6a31ed", "08eda97", "96bf2db", "23975f5", "f3b0cdb", "f5ef10d",
  "de172b0", "3686d09", "4aec0c7");

fixes['4.9']['fixed_ver']           = '4.9.3';
fixes['4.9']['fixed_ver_display']   = '4.9.3-pre (changeset ab34a43)';
fixes['4.9']['affected_ver_regex']  = '^4\\.9\\.';
fixes['4.9']['affected_changesets'] = make_list("023da62", "01b624b",
  "c4fda1d", "946badc", "db356a4", "0c9baf6", "c847824", "66a3e68",
  "ec32158", "6522c1c", "284c601", "3d2dc31", "a1b223b", "a894c9d",
  "d866881", "819e114", "c6055c5", "cc15a7b", "15124d9", "7f4a82d",
  "e40bfc1", "53b22ad", "ec3030f", "84dd174", "c4d86c6", "a6ac51a",
  "514785c", "f904bdd", "036006f", "f5c692a", "612ff3c", "555ef37",
  "e76d0f7", "19f4f87", "c4cb7d3", "8cdaac2", "7fbbedd", "46863c6",
  "041844b", "0a9c2bd", "5d92007", "c257e35", "ad08a1b", "c50b1f6",
  "238007d", "0b1904c", "859fc55", "1c6b8f2", "f51d368", "8689cd1",
  "fc72347", "27b0dcd", "8d874a8", "1284b90", "12259ff", "516ac8a",
  "ed217c9", "11eb72e", "3f85ebb", "1ed3466", "37c3cb4", "2aca1d7",
  "22a6433", "8a29d83", "14a2ad6", "c6d09b2", "e5de993", "c2029b4",
  "5633efa", "13cb0c2", "da140c6", "39ab89d", "a29695c", "74fa955",
  "b3277ca", "cf264eb", "809d543", "002ea4d", "1f183b5", "150cdd9",
  "f7889b3", "903f2f6", "4bbed1c", "2303a9d", "d674b6e", "52fa2f7",
  "62bd851", "c06ec81", "dbb06d3", "24fa3fa", "b9b5a03", "35a71c6",
  "b844573", "48dd543", "7866e11", "db7accf", "921bff4", "c147505",
  "dc527ff", "781e23a", "72ca580", "47d41f6", "7a59015", "259bee9",
  "6d4c4f0", "3e010f5");

fixes['4.10']['fixed_ver']           = '4.10.2';
fixes['4.10']['fixed_ver_display']   = '4.10.2-pre (changeset 5fd0bb3)';
fixes['4.10']['affected_ver_regex']  = '^4\\.10\\.';
fixes['4.10']['affected_changesets'] = make_list("9e7ee94", "0de39f3",
  "6504045", "b4d6690", "09b6924", "2450f34", "227da39", "07a9be7",
  "dcca8f0", "8af1a79", "93017a6", "6e57d28", "87c83af", "b07c76f",
  "541a105", "6f6207f", "6feafd8", "01eb262", "512d3e7", "74f437f",
  "371149b", "3607213", "7145525", "498716e", "fab92fc", "bc1289f",
  "4ccf397", "381fdae", "d976fe5", "a645331", "c220240", "78a86a7",
  "6e0e45a", "b81a8bf", "de578bc", "3bd7966", "dd07d3e", "b5e9f1e",
  "e0da0d9", "2308158", "b2444d2", "42219af", "1d5a9ec", "eeb1576",
  "4b9dc6d", "52447b3", "7b35e78", "8d48204", "b3a7f2f", "fb78102",
  "245eaee", "18833a8", "72e5b16", "27a4161", "23114db", "6300cdd",
  "2a0913e", "daaf3dd", "c2b84e7", "908ddbb", "c75bbf1", "e9dc0a6",
  "470daef", "c9fdfbb", "49aebf4", "48ad1ab", "98a285c", "cb2a83f",
  "51b7b5d", "840d683", "ec50d21", "a035518", "8342e3f", "aaf66de",
  "7e21b75", "f155f55", "3a903b3", "2e2f337", "850e5ad", "13fa2a4",
  "ade8f98", "a7f8880", "3bb756b", "1aa6305", "d93ae63", "6b8d820", "f253feb");

fixes['4.11']['fixed_ver']           = '4.11.1';
fixes['4.11']['fixed_ver_display']   = '4.11.1-pre (changeset fa79f9e)';
fixes['4.11']['affected_ver_regex']  = '^4\\.11\\.';
fixes['4.11']['affected_changesets'] = make_list("1d32c21", "7b420e8",
  "8b35b97", "cfdd4e8", "218d403", "b52017c", "52b8f9a", "935e9c4",
  "61cc876", "4254e98", "6fe9726", "33ced72", "7de2155", "06d2a76",
  "543027c", "037fe82", "353edf1", "75313e4", "5908b48", "bd51a64",
  "0a2016c", "b53e0de", "a44cf0c", "ac35e05", "10c5482", "4bdeedb",
  "da33530", "e932371", "1fd87ba");


fix = NULL;
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_WARNING);