CVE-2021-1390 : What You Need to Know

A vulnerability in one of the diagnostic test CLI commands of Cisco IOS XE Software could allow an authenticated, local attacker to execute arbitrary code on an affected device. This article provides insights into the technical details, impact, and mitigation steps related to CVE-2021-1390.

Understanding CVE-2021-1390

This section delves into the specifics of the CVE, highlighting key aspects for a comprehensive understanding.

What is CVE-2021-1390?

CVE-2021-1390 refers to a vulnerability in Cisco IOS XE Software that enables a local attacker with valid user credentials to execute arbitrary code on the affected device.

The Impact of CVE-2021-1390

The potential impact of this vulnerability stems from the ability of an attacker to overwrite system memory locations on the underlying Linux OS, leading to arbitrary code execution.

Technical Details of CVE-2021-1390

This section provides a detailed overview of the vulnerability, including its description, affected systems, and exploitation mechanism.

Vulnerability Description

The vulnerability arises from the software's allowance for modification of run-time memory, triggering a logic error that enables unauthorized code execution through specific CLI commands.

Affected Systems and Versions

Cisco IOS XE Software versions are affected by this vulnerability, creating a potential risk for devices under specific circumstances.

Exploitation Mechanism

To exploit this vulnerability, an authenticated local attacker with high privileges needs to execute a specific diagnostic test command at the CLI, triggering a logic error for unauthorized code execution.

Mitigation and Prevention

This section outlines essential steps to mitigate the risks posed by CVE-2021-1390 and prevent potential exploitation.

Immediate Steps to Take

Ensure that access to affected devices is restricted, monitor for any unauthorized activities, and consider applying relevant patches or updates from the vendor.

Long-Term Security Practices

Implement robust user access controls, regularly audit device configurations, and stay informed about security advisories to enhance overall resilience against similar vulnerabilities.

Patching and Updates

Stay updated with vendor releases for patches or security updates addressing CVE-2021-1390, and ensure timely deployment to secure the affected systems.