CVE-2021-1128 : Security Advisory and Response

A vulnerability in the CLI parser of Cisco IOS XR Software allows an authenticated attacker to access more information than permitted. This could lead to the exposure of sensitive data within the configuration.

Understanding CVE-2021-1128

This CVE describes a vulnerability in Cisco IOS XR Software that enables a local attacker to view restricted information.

What is CVE-2021-1128?

The vulnerability in the CLI parser of Cisco IOS XR Software permits an authenticated, local attacker to access more information than their privileges allow due to insufficient restrictions.

The Impact of CVE-2021-1128

A successful exploit of this vulnerability could result in the attacker obtaining sensitive configuration information beyond their authorized access.

Technical Details of CVE-2021-1128

This section delves into the specifics of the vulnerability, affected systems, and the exploitation mechanism.

Vulnerability Description

The vulnerability arises from inadequate restrictions in the execution of a specific command within the CLI parser.

Affected Systems and Versions

The vulnerability affects Cisco IOS XR Software, with specific version details not publicly disclosed.

Exploitation Mechanism

An attacker can exploit this vulnerability by executing a particular command in the CLI, enabling access to restricted configuration data.

Mitigation and Prevention

This section provides guidance on addressing and preventing the CVE-2021-1128 vulnerability.

Immediate Steps to Take

Users are advised to apply relevant security patches or updates provided by Cisco to mitigate this vulnerability.

Long-Term Security Practices

Implement strict access controls, user privilege management, and regular security training to enhance overall security posture.

Patching and Updates

Regularly monitor Cisco security advisories for patches and updates to protect systems from known vulnerabilities.