CVE-2019-1728 : Security Advisory and Response

A weakness in the Secure Configuration Validation feature in Cisco FXOS Software and Cisco NX-OS Software could allow a local attacker with authenticated access to execute arbitrary commands with root privileges during system boot.

Understanding CVE-2019-1728

This CVE involves a vulnerability in Cisco FXOS Software and Cisco NX-OS Software that could be exploited by an attacker with authenticated access.

What is CVE-2019-1728?

The vulnerability arises from inadequate validation of system files when reading persistent configuration information, enabling an attacker to replace configuration storage with malicious files and execute arbitrary commands with root privileges during system startup.

The Impact of CVE-2019-1728

CVSS Base Score: 6.7 (Medium Severity)
Attack Vector: Local
Attack Complexity: Low
Privileges Required: High
Confidentiality Impact: High
Integrity Impact: High
Availability Impact: High
Scope: Unchanged
User Interaction: None
The successful exploitation allows the attacker to execute arbitrary commands with root privileges.

Technical Details of CVE-2019-1728

This section provides detailed technical information about the vulnerability.

Vulnerability Description

The vulnerability allows an attacker to run arbitrary commands with root privileges during system boot by manipulating system files.

Affected Systems and Versions

Affected Product: Cisco NX-OS Software
Vendor: Cisco
Affected Versions: Less than 8.3(1) (Custom Version)

Exploitation Mechanism

To exploit this vulnerability, the attacker needs authenticated access to the device and must replace the persistent configuration storage with malicious executable files.

Mitigation and Prevention

Protect your systems from CVE-2019-1728 with these mitigation strategies.

Immediate Steps to Take

Implement the recommended patches from the vendor.
Monitor system logs for any suspicious activities.
Restrict access to critical systems to authorized personnel only.

Long-Term Security Practices

Regularly update and patch all software and firmware.
Conduct security training for employees to raise awareness of social engineering attacks.

Patching and Updates

Apply the latest security updates and patches provided by Cisco to address this vulnerability.