Vulnerabilities > CVE-2019-1715 - Insufficient Entropy in PRNG vulnerability in Cisco products

CVSS 5.0 - MEDIUM

Attack vector

NETWORK

Attack complexity

LOW

Privileges required

NONE

Confidentiality impact

PARTIAL

Integrity impact

NONE

Availability impact

NONE

network

low complexity

cisco

CWE-332

nessus

NVD

Published: 2019-05-03

Updated: 2019-10-09

Summary

A vulnerability in the Deterministic Random Bit Generator (DRBG), also known as Pseudorandom Number Generator (PRNG), used in Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a cryptographic collision, enabling the attacker to discover the private key of an affected device. The vulnerability is due to insufficient entropy in the DRBG when generating cryptographic keys. An attacker could exploit this vulnerability by generating a large number of cryptographic keys on an affected device and looking for collisions with target devices. A successful exploit could allow the attacker to impersonate an affected target device or to decrypt traffic secured by an affected key that is sent to or from an affected target device.

Vulnerable Configurations

Part	Description	Count
Application	Cisco Cisco Adaptive Security Appliance Device Manager * Cisco Firepower Threat Defense 6.2.1 Cisco Firepower Threat Defense 6.2.2 Cisco Firepower Threat Defense 6.2.2.1 Cisco Firepower Threat Defense 6.2.2.2 Cisco Firepower Threat Defense 6.2.2.3 Cisco Firepower Threat Defense 6.2.2.4 Cisco Firepower Threat Defense 6.2.2.5 Cisco Firepower Threat Defense 6.2.3 Cisco Firepower Threat Defense 6.2.3.1 Cisco Firepower Threat Defense 6.2.3.2 Cisco Firepower Threat Defense 6.2.3.3 Cisco Firepower Threat Defense 6.2.3.4 Cisco Firepower Threat Defense 6.2.3.5 Cisco Firepower Threat Defense 6.2.3.6 Cisco Firepower Threat Defense 6.2.3.7 Cisco Firepower Threat Defense 6.2.3.9 Cisco Firepower Threat Defense 6.2.3.10 Cisco Firepower Threat Defense 6.2.3.11 Cisco Firepower Threat Defense 6.3.0 Cisco Firepower Threat Defense 6.3.0.1 Cisco Firepower Threat Defense 6.3.0.2	22
Hardware	Cisco Cisco ASA 5506 X - Cisco ASA 5506H X - Cisco ASA 5506W X - Cisco ASA 5508 X - Cisco ASA 5516 X - Cisco ASA 5525 X - Cisco ASA 5545 X - Cisco ASA 5555 X - Cisco ASA 5500 -	9

Common Weakness Enumeration (CWE)

CWE-332 - Insufficient Entropy in PRNG

Nessus

NASL family	CISCO
NASL id	CISCO-SA-20190501-ASA-FTD-ENTROPY.NASL
description	According to its self-reported version, Adaptive Security Appliance Software or Cisco Firepower Threat Defense Software is affected by a vulnerability in the Deterministic Random Bit Generator (DRBG), alsoknown as Pseudorandom Number Generator (PRNG), used in Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause acryptographic collision, enabling the attacker to discover the private key of an affected device. The vulnerability is due to insufficient entropy in the DRBG when generating cryptographic keys. An attacker could exploit this vulnerability by generating a large number of cryptographic keys on an affected device and looking for collisions with target devices. A successful exploit could allow the attacker to impersonate an affected target device or to decrypt traffic secured byan affected key that is sent to or from an affected target device. Please see the included Cisco BIDs and Cisco Security Advisory for more information
last seen	2020-06-01
modified	2020-06-02
plugin id	126341
published	2019-06-28
reporter	This script is Copyright (C) 2019 and is owned by Tenable, Inc. or an Affiliate thereof.
source	https://www.tenable.com/plugins/nessus/126341
title	Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Low-Entropy Keys Vulnerability

References

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190501-asa-ftd-entropy