Arista Networks Networks CloudVision Portal IP fragment DoS (SA0037)

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

include('compat.inc');

if (description)
{
  script_id(138338);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/07/10");

  script_cve_id("CVE-2018-5391");

  script_name(english:"Arista Networks Networks CloudVision Portal IP fragment DoS (SA0037)");

  script_set_attribute(attribute:"synopsis", value:
"The version of Arista Networks CloudVision Portal running on the remote device is affected by a denial of service vulnerability.");
  script_set_attribute(attribute:"description", value:
"The version of Arista Networks CloudVision Portal running on the remote device is affected by a denial of service
(DoS) vulnerability. The Linux kernel is vulnerable to a DoS attack with low rates of specially modified packets
targeting IP fragment re-assembly. An remote, unauthenticated attacker can cause a DoS condition by sending specially
crafted IP fragments. This vulnerability is caused by the increase of the IP fragment reassembly queue size in the Linux
kernel.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number. To retrieve patch level information this plugin requires the HTTP credentials of the web console.");
  # https://www.arista.com/en/support/advisories-notices/security-advisories/5782-security-advisory-37
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?5c910c33");
  script_set_attribute(attribute:"solution", value:
"Upgrade to a fixed version or apply the mitigation as referenced in the vendor advisory.");
  script_set_cvss_base_vector("CVSS2#AV:N/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:N/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-2018-5391");

  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:"2020/07/09");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:arista:cloudvision_portal");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Misc.");

  script_copyright(english:"This script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("arista_cloudvision_portal_detect.nbin");
  script_require_keys("installed_sw/Arista CloudVision Portal");

  exit(0);
}
include('http.inc');
include('vcf.inc');

if (report_paranoia < 2)
  audit(AUDIT_PARANOID);

port = get_http_port(default:443);
app = 'Arista CloudVision Portal';

app_info = vcf::get_app_info(app:app, port:port, webapp:TRUE);

version_list = make_list(
  '2015.1.2',
  '2015.1.1',
  '2016.1.2.3',
  '2016.1.2.1',
  '2016.1.2',
  '2016.1.1',
  '2016.1.0',
  '2017.2.3',
  '2017.2.2',
  '2017.2.1',
  '2017.2.0',
  '2017.1.1.1',
  '2017.1.1',
  '2017.1.0.1',
  '2017.1.0',
  '2018.1.2.1',
  '2018.1.2',
  '2018.1.1',
  '2018.1.0'
);

vuln = FALSE;
foreach version (version_list)
{
  if (app_info['version'] == version)
  {
    vuln = TRUE;
    break;
  }
}

if (!vuln)
  audit(AUDIT_WEB_APP_NOT_AFFECTED, app_info.app, build_url2(qs:app_info.path, port:app_info.port), app_info.version);

constraints = [
  {'min_version' : '2015.1.1', 'fixed_version':'2018.2.0'}
];

vcf::check_version_and_report(
  app_info:app_info,
  constraints:constraints,
  severity:SECURITY_HOLE
);