CVE-2021-34755 : What You Need to Know

Cisco Firepower Threat Defense software has been identified with multiple vulnerabilities in its Command Line Interface (CLI) that could potentially allow a local attacker to execute arbitrary commands with root privileges. This CVE was published on October 27, 2021.

Understanding CVE-2021-34755

This section provides detailed insights into the impact, technical aspects, and mitigation strategies related to CVE-2021-34755.

What is CVE-2021-34755?

The CVE-2021-34755 relates to command injection vulnerabilities found in the CLI of Cisco Firepower Threat Defense (FTD) Software. These vulnerabilities can be exploited by an authenticated, local attacker to run arbitrary commands with escalated privileges.

The Impact of CVE-2021-34755

The impact of this vulnerability is rated as medium with a base CVSS score of 6.7. It poses a high risk to confidentiality, integrity, and availability of affected systems. Malicious actors could potentially gain unauthorized access and control over the system through this exploit.

Technical Details of CVE-2021-34755

Below are the technical details associated with CVE-2021-34755 including vulnerability description, affected systems, and exploitation mechanism.

Vulnerability Description

The vulnerability allows an attacker to execute commands with root privileges through the CLI of Cisco Firepower Threat Defense Software. This could lead to unauthorized access and control over the system.

Affected Systems and Versions

The affected product is the Cisco Firepower Threat Defense Software, with all versions being vulnerable to this exploit.

Exploitation Mechanism

An authenticated, local attacker can leverage this vulnerability to execute arbitrary commands on the targeted system, potentially leading to a complete compromise of the system.

Mitigation and Prevention

Here are the recommended steps to mitigate the risks associated with CVE-2021-34755.

Immediate Steps to Take

Cisco recommends immediately applying the necessary security patches provided by the vendor to address this vulnerability.
Restrict network access to the affected systems to minimize the risk of exploitation.

Long-Term Security Practices

Regularly monitor and update the security configurations of Cisco Firepower Threat Defense Software to prevent similar vulnerabilities in the future.
Educate users on best practices regarding system access and permissions to avoid unauthorized actions.

Patching and Updates

Stay informed about security alerts and updates from Cisco to ensure timely installation of patches for addressing known vulnerabilities.