CVE-2019-1727 : Vulnerability Insights and Analysis

A vulnerability in the Python scripting subsystem of Cisco NX-OS Software allows an authenticated local attacker to bypass the Python parser and execute unauthorized commands to elevate privileges.

Understanding CVE-2019-1727

This CVE involves a flaw in Cisco NX-OS Software that enables a local attacker to escalate privileges through the Python scripting subsystem.

What is CVE-2019-1727?

The vulnerability in Cisco NX-OS Software permits a local attacker with authentication to bypass the Python parser, issue unauthorized commands, and gain higher privileges. The flaw arises from inadequate validation of user-provided parameters used by specific Python functions in the scripting sandbox.

The Impact of CVE-2019-1727

An attacker can exploit this vulnerability to execute arbitrary commands and elevate their privilege level.
Successful exploitation requires administrative or Python execution privileges and local access to the targeted device.
The likelihood of successful exploitation is limited due to these requirements.

Technical Details of CVE-2019-1727

This section provides detailed technical information about the vulnerability.

Vulnerability Description

The flaw in Cisco NX-OS Software allows a local attacker to bypass the Python parser, execute unauthorized commands, and escalate privileges by exploiting insufficient validation of user-provided parameters.

Affected Systems and Versions

Affected Product: Cisco NX-OS Software
Vulnerable Versions:
Less than 6.2(25)
Less than 8.3(2)
Less than 7.0(3)I7(3)
Less than 9.2(1)

Exploitation Mechanism

Attacker must be authenticated and have administrative or Python execution privileges.
Local access to the targeted device is required for successful exploitation.

Mitigation and Prevention

Protecting systems from CVE-2019-1727 involves immediate steps and long-term security practices.

Immediate Steps to Take

Apply vendor-provided patches and updates promptly.
Restrict access to administrative and Python execution privileges.
Monitor and restrict local access to devices.

Long-Term Security Practices

Regularly update and patch software to address vulnerabilities.
Implement strong authentication mechanisms and access controls.
Conduct security training to educate users on best practices.

Patching and Updates

Cisco has released patches to address the vulnerability.
Regularly check for updates and apply them to ensure system security.