CVE-2021-40119 : Exploit Details and Defense Strategies

This CVE report discloses a critical vulnerability in Cisco Policy Suite that could allow unauthorized remote attackers to access affected systems.

Understanding CVE-2021-40119

This section provides insights into the nature and impact of the CVE-2021-40119 vulnerability.

What is CVE-2021-40119?

The CVE-2021-40119 vulnerability is a flaw in the key-based SSH authentication mechanism of Cisco Policy Suite. It enables unauthenticated remote attackers to log in to an impacted system as the root user due to the reuse of static SSH keys.

The Impact of CVE-2021-40119

The impact of CVE-2021-40119 includes:

CVSS Base Score: 9.8 (Critical)
Attack Vector: Network
Confidentiality, Integrity, and Availability Impact: High
Attack Complexity: Low
Privileges Required: None

Technical Details of CVE-2021-40119

This section delves into the technical aspects of CVE-2021-40119.

Vulnerability Description

The vulnerability arises from the reuse of static SSH keys across installations in Cisco Policy Suite, allowing attackers to extract keys and gain unauthorized root access to affected systems.

Affected Systems and Versions

Vendor: Cisco
Product: Cisco Policy Suite (CPS) Software
Affected Version: n/a

Exploitation Mechanism

Attackers can exploit this vulnerability by extracting a key from a system under their control, potentially leading to unauthorized access to affected systems.

Mitigation and Prevention

Recommendations to address and prevent the CVE-2021-40119 vulnerability.

Immediate Steps to Take

Monitor Cisco's security advisories for patches and updates
Implement network security best practices
Consider limiting SSH access to affected systems

Long-Term Security Practices

Perform regular security assessments and audits
Educate staff on safe SSH key management practices
Utilize unique SSH keys for each installation

Patching and Updates

Apply relevant patches and updates provided by Cisco
Follow best practices for secure SSH key management