CVE-2019-1599 : Exploit Details and Defense Strategies

An unauthenticated, remote attacker could exploit a vulnerability in Cisco NX-OS Software's network stack to cause a denial of service (DoS) on the affected device. This CVE affects various Cisco products including Nexus switches and UCS fabric interconnects.

Understanding CVE-2019-1599

This CVE describes a vulnerability in the network stack of Cisco NX-OS Software that could lead to a DoS condition on the affected device.

What is CVE-2019-1599?

The vulnerability arises from memory buffer allocation issues in the network stack, allowing attackers to trigger a DoS scenario by sending manipulated TCP streams to the device.

The Impact of CVE-2019-1599

CVSS Base Score: 8.6 (High)
Attack Vector: Network
Availability Impact: High
This vulnerability affects a range of Cisco products, potentially disrupting control and management plane protocols.

Technical Details of CVE-2019-1599

This section provides detailed technical information about the vulnerability.

Vulnerability Description

The vulnerability in Cisco NX-OS Software's network stack allows unauthenticated attackers to exhaust memory buffers, leading to a DoS condition.

Affected Systems and Versions

Nexus 1000V Switch for Microsoft Hyper-V (prior to 5.2(1)SM3(2.1))
Nexus 1000V Switch for VMware vSphere (prior to 5.2(1)SV3(4.1a))
Nexus 3000, 3500, 3600, 5500, 5600, 6000, 7000, 7700, 9000 Series Switches
UCS 6200, 6300, 6400 Series Fabric Interconnects

Exploitation Mechanism

Attackers can exploit this vulnerability by sending crafted TCP streams to the affected device, depleting its memory buffers and causing a DoS condition.

Mitigation and Prevention

To address CVE-2019-1599, follow these mitigation strategies:

Immediate Steps to Take

Apply vendor-supplied patches or updates promptly.
Implement network segmentation to limit exposure.

Long-Term Security Practices

Regularly monitor network traffic for anomalies.
Conduct security assessments and penetration testing.

Patching and Updates

Cisco has released patches for the affected products. Ensure timely installation of these updates to mitigate the vulnerability.