CVE-2021-34726 Explained : Impact and Mitigation

A vulnerability in the CLI of Cisco SD-WAN Software could allow an authenticated, local attacker to inject arbitrary commands to be executed with root-level privileges on the underlying operating system of an affected device.

Understanding CVE-2021-34726

This CVE highlights a security vulnerability in Cisco SD-WAN Software that could enable an attacker to execute commands with elevated privileges.

What is CVE-2021-34726?

The vulnerability in Cisco SD-WAN Software allows an authenticated attacker to inject and execute arbitrary commands with root-level access on the affected device by exploiting insufficient input validation on certain CLI commands.

The Impact of CVE-2021-34726

If successfully exploited, an attacker could run commands with root-level privileges, potentially leading to unauthorized access and control of the affected device.

Technical Details of CVE-2021-34726

This section provides specific technical insights into the vulnerability.

Vulnerability Description

The vulnerability stems from the lack of proper input validation on specific CLI commands, enabling attackers to execute malicious commands with elevated privileges.

Affected Systems and Versions

The vulnerability affects the Cisco SD-WAN Solution, with all versions being susceptible to this security flaw.

Exploitation Mechanism

To exploit this vulnerability, an attacker needs to be authenticated as an administrative user on the affected device and submit crafted input to the CLI to execute malicious commands.

Mitigation and Prevention

Protecting systems from CVE-2021-34726 through immediate actions and long-term security practices is crucial.

Immediate Steps to Take

Update the affected Cisco SD-WAN Software to the latest version, apply patches released by Cisco, and closely monitor for any unusual activities on the network.

Long-Term Security Practices

Implement strict user access controls, conduct regular security audits, train employees on identifying phishing attempts, and stay informed about emerging threats.

Patching and Updates

Regularly check for security advisories from Cisco, promptly install security patches, and maintain a proactive stance towards enhancing the security posture of your network.