CVE-2020-3398 : Security Advisory and Response

A vulnerability in the Border Gateway Protocol (BGP) Multicast VPN (MVPN) implementation of Cisco NX-OS Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition by resetting BGP sessions.

Understanding CVE-2020-3398

This CVE involves a vulnerability in Cisco NX-OS Software that could lead to a partial denial of service due to incorrect parsing of a specific type of BGP MVPN update message.

What is CVE-2020-3398?

The vulnerability allows an attacker to repeatedly reset BGP sessions, causing a partial denial of service condition due to BGP session interruptions.

The Impact of CVE-2020-3398

Attackers can exploit the vulnerability to disrupt BGP peer connections, leading to route instability and potential traffic impact.

Technical Details of CVE-2020-3398

This section provides more technical insights into the vulnerability.

Vulnerability Description

The vulnerability arises from incorrect parsing of a specific type of BGP MVPN update message in Cisco NX-OS Software.

Affected Systems and Versions

Product: Cisco NX-OS Software
Vendor: Cisco
Version: n/a

Exploitation Mechanism

Attackers can exploit the vulnerability by sending a specific BGP MVPN update message to a targeted device over an established TCP connection.

Mitigation and Prevention

Steps to address and prevent exploitation of CVE-2020-3398.

Immediate Steps to Take

Apply vendor-provided patches or updates to mitigate the vulnerability.
Monitor BGP sessions for unusual resets or disruptions.

Long-Term Security Practices

Regularly update and patch network devices to address known vulnerabilities.
Implement network segmentation and access controls to limit the impact of potential attacks.

Patching and Updates

Stay informed about security advisories from Cisco and apply relevant patches promptly.