ESXi 6.0 / 6.5 / 6.7 Use-After-Free (VMSA-2019-0014)

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

include("compat.inc");

if (description)
{
  script_id(129497);
  script_version("1.5");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/09/02");

  script_cve_id("CVE-2019-5527");
  script_xref(name:"VMSA", value:"2019-0014");
  script_xref(name:"IAVA", value:"2019-A-0344");

  script_name(english:"ESXi 6.0 / 6.5 / 6.7 Use-After-Free (VMSA-2019-0014)");

  script_set_attribute(attribute:"synopsis", value:
"The remote VMware ESXi host is missing a security patch and is affected by a use-after-free error.");
  script_set_attribute(attribute:"description", value:
"The remote VMware ESXi host is version 6.0, 6.5 or 6.7 and is affected by a use-after-free error in the virtual sound
device that allows a local attacker on the guest machine with low privileges to execute code on the host.

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://www.vmware.com/security/advisories/VMSA-2019-0014.html");
  script_set_attribute(attribute:"solution", value:
"Apply the appropriate patch as referenced in the vendor advisory.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:C/I:C/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:H/I:H/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-2019-5527");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2019/09/19");
  script_set_attribute(attribute:"patch_publication_date", value:"2019/09/19");
  script_set_attribute(attribute:"plugin_publication_date", value:"2019/10/02");

  script_set_attribute(attribute:"potential_vulnerability", value:"true");
  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:vmware:esxi");
  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) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("vmware_vsphere_detect.nbin");
  script_require_keys("Settings/ParanoidReport", "Host/VMware/version", "Host/VMware/release", "Host/VMware/vsphere");

  exit(0);
}

include('audit.inc');
include('global_settings.inc');
include('misc_func.inc');

if (report_paranoia < 2) audit(AUDIT_PARANOID);

fixes = make_array(
  '6.0', '14513180',
  '6.5', '13004031',
  '6.7', '12986307'
);

rel = get_kb_item_or_exit('Host/VMware/release');
if ('ESXi' >!< rel) audit(AUDIT_OS_NOT, 'ESXi');

ver = get_kb_item_or_exit('Host/VMware/version');
port = get_kb_item_or_exit('Host/VMware/vsphere');

match = pregmatch(pattern:'^ESXi? ([0-9]+\\.[0-9]+).*$', string:ver);
if (isnull(match)) audit(AUDIT_UNKNOWN_BUILD, 'VMware ESXi', '6.0 / 6.5 / 6.7');
ver = match[1];

if (ver !~ '^6\\.(0|5|7)$') audit(AUDIT_OS_NOT, 'ESXi 6.0 / 6.5 / 6.7');

fixed_build = int(fixes[ver]);

if (empty_or_null(fixed_build)) audit(AUDIT_VER_FORMAT, ver);

match = pregmatch(pattern:'^VMware ESXi.*build-([0-9]+)$', string:rel);
if (isnull(match)) audit(AUDIT_UNKNOWN_BUILD, 'VMware ESXi', '6.0 / 6.5 / 6.7');

build = int(match[1]);

if (build >= fixed_build) audit(AUDIT_INST_VER_NOT_VULN, 'VMware ESXi', ver + ' build ' + build);

report = '\n  ESXi version    : ' + ver +
         '\n  Installed build : ' + build +
         '\n  Fixed build     : ' + fixed_build +
         '\n';

security_report_v4(port:port, severity:SECURITY_HOLE, extra:report);