CVE-2017-6650 : What You Need to Know

A security weakness has been identified in the Telnet CLI command of Cisco NX-OS System Software 7.1 through 7.3, which is installed on Cisco Nexus Series Switches. This vulnerability could be exploited by an authorized, local attacker to launch a command injection attack.

Understanding CVE-2017-6650

This CVE involves a vulnerability in the Telnet CLI command of Cisco NX-OS System Software 7.1 through 7.3 running on Cisco Nexus Series Switches.

What is CVE-2017-6650?

The vulnerability allows an authenticated, local attacker to perform a command injection attack due to insufficient input validation of command arguments.

The Impact of CVE-2017-6650

An attacker could inject manipulated command arguments into the Telnet CLI command to read or modify arbitrary files within the user's privilege level but outside their designated path.
Successful exploitation could lead to unauthorized access and potential data manipulation.

Technical Details of CVE-2017-6650

This section provides more technical insights into the vulnerability.

Vulnerability Description

The vulnerability lies in the inadequate validation of command arguments in the Telnet CLI command.
Exploiting this flaw could allow attackers to execute arbitrary commands.

Affected Systems and Versions

Product: Cisco Nexus Series Switches
Versions: Cisco NX-OS System Software 7.1 through 7.3

Exploitation Mechanism

An attacker needs to inject manipulated command arguments into the Telnet CLI command to exploit the vulnerability.

Mitigation and Prevention

Protecting systems from CVE-2017-6650 requires immediate actions and long-term security practices.

Immediate Steps to Take

Disable Telnet services if not required and use secure alternatives like SSH.
Apply vendor-supplied patches and updates promptly.

Long-Term Security Practices

Regularly monitor and audit system logs for unusual activities.
Implement network segmentation to limit the impact of potential breaches.

Patching and Updates

Stay informed about security advisories from Cisco and apply patches as soon as they are available.