CVE-2017-6678 : Security Advisory and Response

Cisco Virtualized Packet Core-Distributed Instance (VPC-DI) Software versions 19.2 through 21.0 are vulnerable to a denial of service (DoS) attack due to improper handling of UDP packets.

Understanding CVE-2017-6678

An unauthenticated attacker can exploit a vulnerability in the UDP packet processing of Cisco VPC-DI Software, causing a DoS scenario by triggering reloads of control function (CF) instances.

What is CVE-2017-6678?

The vulnerability in Cisco VPC-DI Software allows an attacker to send manipulated UDP packets to CF instances, leading to unhandled errors, CF reloads, and ultimately a system-wide reload, disconnecting all subscribers.

The Impact of CVE-2017-6678

Successful exploitation results in a DoS situation on the affected system
Only exploitable via IPv4 traffic
Disconnection of all subscribers

Technical Details of CVE-2017-6678

Cisco VPC-DI Software vulnerability details

Vulnerability Description

Insufficient handling of user-supplied data in UDP packet processing
Exploitable by crafting UDP packets to CF instances

Affected Systems and Versions

Cisco Virtualized Packet Core-Distributed Instance Software versions 19.2 through 21.0

Exploitation Mechanism

Attacker sends manipulated UDP packets to CF instances
Triggers unhandled errors, CF reloads, and system-wide reload

Mitigation and Prevention

Steps to address CVE-2017-6678

Immediate Steps to Take

Apply vendor patches and updates promptly
Implement network segmentation to limit exposure

Long-Term Security Practices

Regularly monitor network traffic for anomalies
Conduct security assessments and audits periodically

Patching and Updates

Refer to Cisco's security advisory for specific patch details