CVE-2018-0369 : Exploit Details and Defense Strategies

A weakness has been discovered in the reassembly logic used for fragmented IPv4 packets on Cisco StarOS, specifically on virtual platforms. This vulnerability could lead to a denial of service (DoS) situation if exploited by an unauthorized remote attacker.

Understanding CVE-2018-0369

This CVE involves a vulnerability in Cisco StarOS that could allow an attacker to trigger a reload of the npusim process, resulting in a DoS condition.

What is CVE-2018-0369?

The vulnerability in the reassembly logic for fragmented IPv4 packets on Cisco StarOS virtual platforms could be exploited by an unauthorized remote attacker to cause a DoS situation.

The Impact of CVE-2018-0369

An attacker could reload the npusim process, leading to a denial of service condition.
The vulnerability affects Cisco Virtualized Packet Core-Single Instance (VPC-SI), Cisco Virtualized Packet Core-Distributed Instance (VPC-DI), and Cisco Ultra Packet Core (UPC).

Technical Details of CVE-2018-0369

This section provides more technical insights into the CVE.

Vulnerability Description

Mishandling of fragmented IPv4 packets containing options leads to the vulnerability.
The attacker needs to transmit a malicious IPv4 packet through an affected device to exploit this weakness.

Affected Systems and Versions

Product: Cisco StarOS unknown
Versions: Cisco StarOS unknown

Exploitation Mechanism

Attacker transmits a malicious IPv4 packet through the affected device.
This causes the npusim process to restart, temporarily dropping all traffic directed towards that specific instance.

Mitigation and Prevention

Protecting systems from CVE-2018-0369 is crucial to prevent potential DoS attacks.

Immediate Steps to Take

Apply vendor-supplied patches promptly.
Monitor network traffic for any suspicious activity.

Long-Term Security Practices

Regularly update and patch all software and firmware.
Implement network segmentation to limit the impact of potential attacks.

Patching and Updates

Stay informed about security advisories from Cisco.
Regularly check for updates and apply them to ensure system security.