CVE-2019-1814 : Exploit Details and Defense Strategies

A vulnerability in the DHCP and TFTP features of Cisco Small Business 300 Series Managed Switches could allow an unauthenticated attacker to trigger a denial of service (DoS) condition by causing the device to reload unexpectedly.

Understanding CVE-2019-1814

This CVE involves a specific vulnerability in Cisco Small Business 300 Series Managed Switches that could be exploited remotely.

What is CVE-2019-1814?

The vulnerability arises from the device's failure to release system memory upon receiving an unexpected DHCP request, leading to a DoS situation when exploited by a crafted DHCP packet.

The Impact of CVE-2019-1814

The vulnerability could result in low system memory, device reload, and a denial of service condition, affecting the availability of the device.

Technical Details of CVE-2019-1814

This section delves into the technical aspects of the CVE.

Vulnerability Description

The vulnerability allows an unauthenticated attacker to exploit the DHCP and TFTP features, causing the device to experience low system memory and unexpected reloads.

Affected Systems and Versions

Product: Cisco Small Business 300 Series Managed Switches
Vendor: Cisco
Version: 1.4.0.88

Exploitation Mechanism

Attacker sends a carefully crafted DHCP packet to the device
Device fails to release system memory, leading to unexpected reload

Mitigation and Prevention

Steps to address and prevent exploitation of CVE-2019-1814.

Immediate Steps to Take

Apply vendor-provided patches and updates promptly
Implement network segmentation to limit exposure
Monitor network traffic for any signs of exploitation

Long-Term Security Practices

Regularly update and patch network devices
Conduct security assessments and audits to identify vulnerabilities

Patching and Updates

Cisco has released patches to address the vulnerability
Regularly check for updates and apply them to ensure system security