Vulnerabilities > CVE-2019-15703 - Insufficient Entropy vulnerability in Fortinet Fortios

047910
CVSS 7.5 - HIGH
Attack vector
NETWORK
Attack complexity
LOW
Privileges required
NONE
Confidentiality impact
HIGH
Integrity impact
NONE
Availability impact
NONE
network
low complexity
fortinet
CWE-331
nessus
NVD
Published: 2019-10-24
Updated: 2024-11-21

Summary

An Insufficient Entropy in PRNG vulnerability in Fortinet FortiOS 6.2.1, 6.2.0, 6.0.8 and below for device not enable hardware TRNG token and models not support builtin TRNG seed allows attacker to theoretically recover the long term ECDSA secret in a TLS client with a RSA handshake and mutual ECDSA authentication via the help of flush+reload side channel attacks in FortiGate VM models only.

Vulnerable Configurations

Part Description Count
OS
Fortinet
169

Common Weakness Enumeration (CWE)

Common Attack Pattern Enumeration and Classification (CAPEC)

  • Session Credential Falsification through Prediction
    This attack targets predictable session ID in order to gain privileges. The attacker can predict the session ID used during a transaction to perform spoofing and session hijacking.

Nessus

NASL familyFirewalls
NASL idFORTIOS_FG-IR-19-186.NASL
descriptionAn Insufficient Entropy in PRNG vulnerability in Fortinet FortiOS 6.2.1 and below for device not enable hardware TRNG token and models not support builtin TRNG seed allows attacker to theoretically recover the long term ECDSA secret in a TLS client with a RSA handshake and mutual ECDSA authentication via the help of flush+reload side channel attacks in FortiGate VM models only.
last seen2020-06-01
modified2020-06-02
plugin id130209
published2019-10-25
reporterThis script is Copyright (C) 2019 and is owned by Tenable, Inc. or an Affiliate thereof.
sourcehttps://www.tenable.com/plugins/nessus/130209
titleFortiOS DRBG unsufficient entropy (FG-IR-19-186)
code
#
# (C) Tenable Network Security, Inc.
#

include("compat.inc");

if (description)
{
  script_id(130209);
  script_version("1.4");
  script_cvs_date("Date: 2019/11/22");

  script_cve_id("CVE-2019-15703");

  script_name(english:"FortiOS DRBG unsufficient entropy (FG-IR-19-186)");
  script_summary(english:"Checks the version of FortiOS.");

  script_set_attribute(attribute:"synopsis", value:
"The remote host is affected by an information disclosure vulnerability.");
  script_set_attribute(attribute:"description", value:
"An Insufficient Entropy in PRNG vulnerability in Fortinet FortiOS 6.2.1 and below for device not enable
hardware TRNG token and models not support builtin TRNG seed allows attacker to theoretically recover the
long term ECDSA secret in a TLS client with a RSA handshake and mutual ECDSA authentication via the help
of flush+reload side channel attacks in FortiGate VM models only.");
  script_set_attribute(attribute:"see_also", value:"https://fortiguard.com/psirt/FG-IR-19-186");
  script_set_attribute(attribute:"solution", value:
"Upgrade to Fortinet FortiOS version 6.2.1 or later.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:H/Au:N/C:P/I:N/A:N");
  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:N/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2019-15703");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2019/10/18");
  script_set_attribute(attribute:"patch_publication_date", value:"2019/10/18");
  script_set_attribute(attribute:"plugin_publication_date", value:"2019/10/25");

  script_set_attribute(attribute:"potential_vulnerability", value:"true");
  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:fortinet:fortios");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Firewalls");

  script_copyright(english:"This script is Copyright (C) 2019 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("fortinet_version.nbin");
  script_require_keys("Host/Fortigate/model", "Host/Fortigate/version", "Settings/ParanoidReport");

  exit(0);
}

include('audit.inc');
include('vcf.inc');

if (report_paranoia < 2) audit(AUDIT_PARANOID);

app_name = 'FortiOS';

app_info = vcf::get_app_info(app:app_name, kb_ver:'Host/Fortigate/version');

constraints = [
  { 'fixed_version' : '6.2.1' }
];

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

References