CVE-2019-1604 : Exploit Details and Defense Strategies

Cisco NX-OS Software Privilege Escalation Vulnerability

Understanding CVE-2019-1604

This CVE involves a vulnerability in the user account management interface of Cisco NX-OS Software that could allow an authenticated, local attacker to gain elevated privileges on affected devices.

What is CVE-2019-1604?

The vulnerability arises from an authorization check deficiency in user accounts and their associated Group ID (GID). By exploiting a logic error, an attacker can execute commands with higher privileges than assigned.

The Impact of CVE-2019-1604

CVSS Score: 7.3 (High Severity)
Attack Vector: Local
Confidentiality Impact: High
Integrity Impact: High
Availability Impact: High

Technical Details of CVE-2019-1604

This section provides detailed technical information about the vulnerability.

Vulnerability Description

The vulnerability allows an authenticated, local attacker to execute commands with elevated privileges due to an incorrect authorization check in user accounts and GID.

Affected Systems and Versions

The following Cisco products and versions are affected:

Nexus 7000 and 7700 Series Switches: Versions prior to 6.2(22), 8.2(3), and 8.3(2)
Nexus 3000 Series Switches: Versions prior to 7.0(3)I7(4)
Nexus 3500 Platform Switches: Versions prior to 7.0(3)I7(4)
Nexus 3600 Platform Switches: Versions prior to 7.0(3)F3(5)
Nexus 9000 Series Switches-Standalone: Versions prior to 7.0(3)I7(4)
Nexus 9500 R-Series Line Cards and Fabric Modules: Versions prior to 7.0(3)F3(5)

Exploitation Mechanism

The vulnerability can be exploited by an authenticated, local attacker leveraging a logic error to gain elevated privileges on the affected device.

Mitigation and Prevention

To address CVE-2019-1604, follow these steps:

Immediate Steps to Take

Apply the necessary patches provided by Cisco.
Monitor Cisco's security advisories for updates.

Long-Term Security Practices

Regularly update and patch Cisco devices.
Implement strong user account management practices.

Patching and Updates

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