CVE-2019-1804 : Exploit Details and Defense Strategies
Learn about CVE-2019-1804, a critical vulnerability in Cisco Nexus 9000 Series ACI Mode Switch Software allowing unauthorized access with root privileges. Find mitigation steps and preventive measures here.
A vulnerability in Cisco Nexus 9000 Series ACI Mode Switch Software's SSH key management could allow unauthorized access to the system with root user privileges.
Understanding CVE-2019-1804
This CVE involves a flaw in SSH key management in Cisco Nexus 9000 Series ACI Mode Switch Software.
What is CVE-2019-1804?
The vulnerability allows a remote attacker to gain root access by exploiting a default SSH key pair present in all devices.
The Impact of CVE-2019-1804
- CVSS Base Score: 9.8 (Critical)
- Attack Vector: Network
- Confidentiality Impact: High
- Integrity Impact: High
- Availability Impact: High
Technical Details of CVE-2019-1804
The technical aspects of the vulnerability are as follows:
Vulnerability Description
- The flaw lies in the SSH key management of Cisco Nexus 9000 Series ACI Mode Switch Software.
Affected Systems and Versions
- Product: Cisco NX-OS Software for Nexus 9000 Series Fabric Switches ACI Mode 11.0.1b
- Version: Unspecified
Exploitation Mechanism
- Attackers can exploit the flaw by establishing an SSH connection via IPv6 using the default key pair.
Mitigation and Prevention
Steps to address and prevent exploitation of CVE-2019-1804:
Immediate Steps to Take
- Disable SSHv6 to mitigate the vulnerability.
- Implement firewall rules to restrict SSH access.
Long-Term Security Practices
- Regularly update and patch the affected systems.
Patching and Updates
- Apply the latest patches and updates from Cisco to address the vulnerability.