CVE-2020-3417 : Vulnerability Insights and Analysis

A vulnerability in Cisco IOS XE Software allows an authenticated, local attacker to execute persistent code at boot time, compromising the chain of trust.

Understanding CVE-2020-3417

This CVE involves a security flaw in Cisco IOS XE Software that enables attackers to execute code persistently.

What is CVE-2020-3417?

The vulnerability arises from incorrect validations in boot scripts when specific ROM monitor variables are set, enabling attackers to install code in the OS directory and execute persistent code.

The Impact of CVE-2020-3417

CVSS Base Score: 6.8 (Medium Severity)
Attack Vector: Adjacent Network
Confidentiality Impact: High
Integrity Impact: High
Availability Impact: High
Attackers can execute persistent code on the underlying OS, potentially leading to system compromise.

Technical Details of CVE-2020-3417

This section delves into the technical aspects of the vulnerability.

Vulnerability Description

The flaw allows authenticated local attackers to execute persistent code at boot time by manipulating ROM monitor variables.

Affected Systems and Versions

Affected Product: Cisco IOS XE Software
Affected Version: Not Applicable

Exploitation Mechanism

Attackers can exploit the vulnerability by installing code in a specific OS directory and setting a ROM monitor variable, requiring root shell access or physical device access.

Mitigation and Prevention

Protecting systems from CVE-2020-3417 involves immediate steps and long-term security practices.

Immediate Steps to Take

Apply vendor patches promptly
Restrict physical access to devices
Monitor and restrict root shell access

Long-Term Security Practices

Implement least privilege access controls
Regularly update and patch systems
Conduct security training for personnel

Patching and Updates

Regularly check for security advisories and apply patches provided by Cisco to mitigate the vulnerability.