CVE-2019-1813 : Security Advisory and Response

Cisco NX-OS CLI Command Software Image Signature Verification Vulnerability

Understanding CVE-2019-1813

This CVE involves a vulnerability in Cisco NX-OS Software that allows an authenticated local attacker with administrator-level credentials to install malicious software on a device.

What is CVE-2019-1813?

An attacker can exploit the Image Signature Verification weakness in Cisco NX-OS Software to install harmful software images on a targeted device.
The vulnerability stems from inadequate verification of software digital signatures during CLI command execution.

The Impact of CVE-2019-1813

CVSS Score: 6.7 (Medium Severity)
Attack Vector: Local
Confidentiality Impact: High
Integrity Impact: High
Availability Impact: High
Privileges Required: High

Technical Details of CVE-2019-1813

This section provides detailed technical information about the vulnerability.

Vulnerability Description

The flaw allows an attacker to install unsigned software images on affected devices.

Affected Systems and Versions

Affected Product: Cisco NX-OS Software
Vulnerable Versions: Less than 8.3(1)

Exploitation Mechanism

Attacker needs administrator-level credentials to exploit the vulnerability.
Inadequate verification of software digital signatures during CLI commands execution.

Mitigation and Prevention

Protect your systems from CVE-2019-1813 with the following steps:

Immediate Steps to Take

Apply vendor-provided patches or updates promptly.
Monitor network traffic for any signs of exploitation.

Long-Term Security Practices

Implement the principle of least privilege to restrict user access.
Regularly review and update security policies and procedures.

Patching and Updates

Regularly check for security advisories from Cisco and apply patches as soon as they are available.