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Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Low-Entropy Keys Vulnerability

high Nessus Plugin ID 126341

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Synopsis

The remote device is missing a vendor-supplied security patch

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

Solution

Upgrade to the relevant fixed version referenced in Cisco bug ID CSCvj52266

See Also

http://www.nessus.org/u?da913d6b

https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvj52266

Plugin Details

Severity: High

ID: 126341

File Name: cisco-sa-20190501-asa-ftd-entropy.nasl

Version: 1.3

Type: local

Family: CISCO

Published: 6/28/2019

Updated: 10/18/2019

Configuration: Enable paranoid mode

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3.6

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:N

CVSS Score Source: CVE-2019-1715

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/a:cisco:adaptive_security_appliance_software, cpe:/o:cisco:firepower_threat_defense

Required KB Items: Settings/ParanoidReport, Host/Cisco/ASA, Host/Cisco/ASA/model

Exploit Ease: No known exploits are available

Patch Publication Date: 5/1/2019

Vulnerability Publication Date: 5/1/2019

Reference Information

CVE: CVE-2019-1715