CVE-2021-34723 : Security Advisory and Response

A vulnerability in a specific CLI command on Cisco IOS XE SD-WAN Software could allow an authenticated, local attacker to overwrite arbitrary files in the configuration database of an affected device. This could lead to gaining root-level access.

Understanding CVE-2021-34723

This CVE involves a vulnerability in Cisco IOS XE SD-WAN Software that could be exploited by a local attacker to overwrite files in the device's configuration database.

What is CVE-2021-34723?

CVE-2021-34723 is a security vulnerability found in a specific CLI command on Cisco IOS XE SD-WAN Software that allows unauthorized users to overwrite files in the device's configuration database.

The Impact of CVE-2021-34723

The vulnerability has a base score of 6.7, with high impacts on confidentiality, integrity, and availability. An attacker could gain root-level access to the affected device.

Technical Details of CVE-2021-34723

This section provides more in-depth technical details about the vulnerability.

Vulnerability Description

The vulnerability arises due to insufficient validation of specific CLI command parameters, allowing an attacker to overwrite files in the configuration database.

Affected Systems and Versions

The vulnerability affects Cisco IOS XE Software versions.

Exploitation Mechanism

An authenticated, local attacker can exploit this vulnerability by running a specific CLI command with malicious parameters to manipulate the configuration database.

Mitigation and Prevention

Here are the steps recommended to mitigate the risks associated with CVE-2021-34723.

Immediate Steps to Take

Apply the necessary patches and updates provided by Cisco to address this vulnerability.
Monitor network devices for any unauthorized access or changes.

Long-Term Security Practices

Implement the principle of least privilege to restrict user access rights.
Regularly review and update security configurations to prevent similar vulnerabilities.

Patching and Updates

Ensure timely application of security patches and updates released by Cisco to safeguard against CVE-2021-34723.