Wind River VxWorks <= 6.8 RCE

#%NASL_MIN_LEVEL 70300
##
# (C) Tenable Network Security, Inc.
##

include('deprecated_nasl_level.inc');
include('compat.inc');

if (description)
{
  script_id(154458);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/10/29");

  script_cve_id("CVE-2021-29999");
  script_xref(name:"IAVA", value:"2021-A-0504");

  script_name(english:"Wind River VxWorks <= 6.8 RCE");

  script_set_attribute(attribute:"synopsis", value:
"The remote VxWorks device is potentially affected by a remote code execution vulnerability.");
  script_set_attribute(attribute:"description", value:
"According to its self-reported version, the remote device is Wind River VxWorks and it's affected by a remote code
execution vulnerability. An issue was discovered in Wind River VxWorks through 6.8. There is a possible stack overflow
in dhcp server.

Note that Nessus has not tested for this issue but has instead relied only on the OS version.");
  # https://support2.windriver.com/index.php?page=cve&on=view&id=CVE-2021-29999
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?6e16c9ca");
  script_set_attribute(attribute:"solution", value:
"Contact the device vendor to obtain the appropriate update.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/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-2021-29999");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2021/04/13");
  script_set_attribute(attribute:"patch_publication_date", value:"2021/04/13");
  script_set_attribute(attribute:"plugin_publication_date", value:"2021/10/27");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:windriver:vxworks");
  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) 2021 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("windriver_vxworks_rtos_detect.nbin");
  script_require_keys("Host/VxWorks");

  exit(0);
}

get_kb_item_or_exit('Host/VxWorks');
var version = get_kb_item('Host/VxWorks/version');
if (empty_or_null(version))
  version = 'unknown';

var vuln = FALSE;

if (version != 'unknown')
{
  vuln = ver_compare(ver:version, fix:'6.8', strict:FALSE) <= 0;
}
else if (report_paranoia >= 2)
{
  # if we cannot tell the version but the check is paranoid, report
  vuln = TRUE;
}

if (vuln)
{
  var report =
    '\n    Version       : ' + version +
    '\n    Fixed Version : See vendor advisory' +
    '\n';

  security_report_v4(port:0, severity:SECURITY_HOLE, extra:report);
}
else if (version == 'unknown') audit(AUDIT_POTENTIAL_VULN, 'VxWorks');
else audit(AUDIT_OS_RELEASE_NOT, 'VxWorks', version);