CVE-2021-34724 : Exploit Details and Defense Strategies

A vulnerability in the Cisco IOS XE SD-WAN Software CLI could allow an authenticated, local attacker to elevate privileges and execute arbitrary code on the underlying operating system as the root user.

Understanding CVE-2021-34724

This CVE represents a privilege escalation vulnerability in Cisco IOS XE SD-WAN Software, allowing an attacker to gain root-level access.

What is CVE-2021-34724?

The vulnerability in Cisco IOS XE SD-WAN Software CLI enables a local attacker with authenticated access to escalate privileges and execute code as the root user.

The Impact of CVE-2021-34724

If exploited successfully, this vulnerability could enable an attacker to read and write changes to the configuration database on the affected device.

Technical Details of CVE-2021-34724

The following details outline the technical aspects of the CVE.

Vulnerability Description

Insufficient file system protection and a sensitive file in the bootflash directory allow an attacker to overwrite an installer file with arbitrary commands for root-level execution.

Affected Systems and Versions

Cisco IOS XE SD-WAN Software is affected, with the vulnerable versions categorized as 'n/a'.

Exploitation Mechanism

An authenticated attacker on an affected device as a PRIV15 user can exploit this vulnerability by manipulating files in the bootflash directory.

Mitigation and Prevention

To mitigate the risks associated with CVE-2021-34724, consider the following steps.

Immediate Steps to Take

Ensure that adequate file system protection measures are in place, restrict local access, and monitor any suspicious activities on the device.

Long-Term Security Practices

Regular monitoring for security updates, user access control, and implementing least privilege access can enhance overall security.

Patching and Updates

Refer to the Cisco advisory for patches and updates to address the privilege escalation vulnerability in the Cisco IOS XE SD-WAN Software.