CVE-2019-1808 : Security Advisory and Response

An issue has been identified in the Image Signature Verification functionality of Cisco NX-OS Software that could potentially enable a local attacker with administrator-level privileges to install a harmful software patch on a targeted device.

Understanding CVE-2019-1808

What is CVE-2019-1808?

CVE-2019-1808 is a vulnerability in Cisco NX-OS Software that allows a local attacker to install a malicious software patch due to inadequate verification of digital signatures for patch images.

The Impact of CVE-2019-1808

The vulnerability has a CVSS base score of 6.7, with high impacts on confidentiality, integrity, and availability. Successful exploitation could lead to the installation of harmful software patches.

Technical Details of CVE-2019-1808

Vulnerability Description

The vulnerability arises from the improper verification of digital signatures for patch images in Cisco NX-OS Software.

Affected Systems and Versions

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

Exploitation Mechanism

Attack Complexity: Low
Attack Vector: Local
Privileges Required: High
Exploitation involves loading an unsigned software patch onto the targeted device.

Mitigation and Prevention

Immediate Steps to Take

Apply the necessary patches provided by Cisco to address the vulnerability.
Monitor for any unauthorized software patch installations.

Long-Term Security Practices

Regularly update and patch software to prevent vulnerabilities.
Implement strict access controls to limit the installation of unauthorized patches.

Patching and Updates

Stay informed about security advisories from Cisco and apply patches promptly to secure systems.