CVE-2017-12351 Explained : Impact and Mitigation

A vulnerability in the guest shell feature of Cisco NX-OS System Software could allow an authenticated, local attacker to read and send packets outside the scope of the guest shell container. This impacts various Cisco Nexus switches and fabric modules.

Understanding CVE-2017-12351

This CVE involves unauthorized internal interface access in Cisco NX-OS System Software.

What is CVE-2017-12351?

The vulnerability allows a local attacker with authorized access to read and transmit packets outside of the guest shell container, requiring valid administrator credentials due to inadequate internal security measures.

The Impact of CVE-2017-12351

Attackers can send or receive packets on the internal network of the device, bypassing the guest shell container's confines.
Products affected include Nexus 3000 Series Switches, Nexus 9000 Series Switches in standalone NX-OS mode, Nexus 9500 R-Series Line Cards, and Fabric Modules.

Technical Details of CVE-2017-12351

This section covers the vulnerability description, affected systems, versions, and exploitation mechanism.

Vulnerability Description

The flaw in the guest shell functionality allows unauthorized internal interface access, impacting Cisco NX-OS System Software.

Affected Systems and Versions

Product: Cisco NX-OS
Versions: Cisco NX-OS

Exploitation Mechanism

Attackers exploit the vulnerability by sending or receiving packets on the internal network outside the guest shell container.

Mitigation and Prevention

Protect your systems from CVE-2017-12351 with these steps:

Immediate Steps to Take

Apply vendor-supplied patches promptly.
Restrict network access to affected systems.
Monitor network traffic for signs of exploitation.

Long-Term Security Practices

Regularly update and patch software and firmware.
Implement the principle of least privilege for user access.
Conduct security training and awareness programs for employees.

Patching and Updates

Stay informed about security advisories from Cisco.
Apply patches and updates as soon as they are available to mitigate the vulnerability.