CVE-2021-1453 : Security Advisory and Response

A vulnerability in the software image verification functionality of Cisco IOS XE Software for the Cisco Catalyst 9000 Family of switches could allow an unauthenticated, physical attacker to execute unsigned code at system boot time.

Understanding CVE-2021-1453

This CVE-2021-1453 is a significant vulnerability in Cisco IOS XE Software that impacts the Cisco Catalyst 9000 Family of switches.

What is CVE-2021-1453?

The vulnerability in the software image verification function could let an attacker execute unsigned code during system boot time on affected devices.

The Impact of CVE-2021-1453

An attacker exploiting this vulnerability can load unsigned software, allowing booting of malicious code and bypassing image verification checks during the secure boot process.

Technical Details of CVE-2021-1453

This section provides more in-depth technical insights into the vulnerability.

Vulnerability Description

The vulnerability arises from an improper check in the code responsible for managing the verification of digital signatures during initial boot processes.

Affected Systems and Versions

Affected products include Cisco IOS XE Software for the Catalyst 9000 Family of switches.

Exploitation Mechanism

To exploit this vulnerability, the attacker would require unauthenticated physical access or privileged access to the root shell on the device.

Mitigation and Prevention

Protecting against CVE-2021-1453 involves taking immediate steps and implementing long-term security practices.

Immediate Steps to Take

Organizations should limit physical access to devices and monitor for unauthorized activity.

Long-Term Security Practices

Regularly update software and firmware, restrict root shell access, and follow security best practices.

Patching and Updates

Apply patches and updates provided by Cisco to address this vulnerability effectively.