Severity.io | CVE-2019-1715

Description

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.

a cisco firepower_threat_defense ********

a cisco adaptive_security_appliance_device_manager ********

h cisco asa-5506-x -*******

h cisco asa-5545-x -*******

h cisco asa-5506h-x -*******

h cisco asa-5555-x -*******

h cisco asa-5506w-x -*******

h cisco asa-5508-x -*******

References

20190501 Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Low-Entropy Keys Vulnerability

Vendor Advisory

CvssV3 impact

BaseSeverity	HIGH
ConfidentialityImpact	HIGH
AttackComplexity	LOW
Scope	UNCHANGED
AttackVector	NETWORK
AvailabilityImpact	NONE
IntegrityImpact	NONE
PrivilegesRequired	NONE
BaseScore	7.5
VectorString	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Version	3.0
UserInteraction	NONE

CvssV2 impact

Version	2.0
VectorString	AV:N/AC:L/Au:N/C:P/I:N/A:N
AccessVector	NETWORK
AccessComplexity	LOW
Authentication	NONE
ConfidentialityImpact	PARTIAL
IntegrityImpact	NONE
AvailabilityImpact	NONE
BaseScore	5