CVE-2019-1609 : Exploit Details and Defense Strategies

A weakness has been identified in Cisco NX-OS Software's Command Line Interface (CLI) that could allow a local attacker with authentication to execute arbitrary commands on the affected device's underlying operating system. This vulnerability stems from inadequate validation of arguments supplied to specific CLI commands.

Understanding CVE-2019-1609

This CVE pertains to a vulnerability in Cisco NX-OS Software that enables unauthorized command execution through the CLI.

What is CVE-2019-1609?

The vulnerability allows a local attacker with authentication to run arbitrary commands on the device's OS due to insufficient validation of CLI command arguments.

The Impact of CVE-2019-1609

If exploited, the attacker can execute unauthorized commands on the OS with elevated privileges, requiring valid administrator credentials for successful exploitation.

Technical Details of CVE-2019-1609

This section provides more technical insights into the vulnerability.

Vulnerability Description

The vulnerability in Cisco NX-OS Software's CLI allows attackers to execute arbitrary commands on the underlying OS by manipulating CLI command arguments.

Affected Systems and Versions

MDS 9000 Series Multilayer Switches: Versions prior to 6.2(27), 8.1(1b), and 8.3(2)
Nexus 3500 Platform Switches: Versions prior to 7.0(3)I7(6)
Nexus 3000 Series Switches: Versions prior to 7.0(3)I4(9) and 7.0(3)I7(6)
Nexus 3600 Platform Switches: Versions prior to 7.0(3)F3(5)
Nexus 7000 and 7700 Series Switches: Versions prior to 6.2(22), 7.3(3)D1(1), 8.2(3), and 8.3(2)
Nexus 9000 Series Switches in Standalone NX-OS Mode: Versions prior to 7.0(3)I4(9) and 7.0(3)I7(6)
Nexus 9500 R-Series Line Cards and Fabric Modules: Versions prior to 7.0(3)F3(5)

Exploitation Mechanism

The attacker needs valid administrator credentials to exploit the vulnerability by injecting malicious input as arguments for specific CLI commands.

Mitigation and Prevention

Protect your systems from CVE-2019-1609 with these steps:

Immediate Steps to Take

Apply vendor-released patches promptly
Monitor network traffic for signs of exploitation
Restrict access to vulnerable systems

Long-Term Security Practices

Regularly update and patch all software and firmware
Implement strong authentication mechanisms
Conduct security training for staff

Patching and Updates

Ensure all affected systems are updated with the latest patches to mitigate the vulnerability.