CVE-2021-1361 Explained : Impact and Mitigation
Learn about CVE-2021-1361, a critical vulnerability in Cisco NX-OS Software that allows attackers to manipulate arbitrary files on Cisco Nexus switches. Find mitigation steps and preventive measures here.
A vulnerability in Cisco NX-OS Software allows an unauthenticated attacker to manipulate arbitrary files with root privileges, impacting Cisco Nexus 3000 and 9000 Series Switches.
Understanding CVE-2021-1361
This CVE identifier pertains to a critical flaw in the internal file management service implementation of Cisco Nexus switches running NX-OS Software.
What is CVE-2021-1361?
The vulnerability allows a remote attacker to create, delete, or overwrite files with root privileges due to misconfiguration in listening to external connection requests on TCP port 9075.
The Impact of CVE-2021-1361
With a CVSSv3.1 base score of 9.8 out of 10, the vulnerability has a critical impact, leading to compromised confidentiality, integrity, and availability of the affected systems.
Technical Details of CVE-2021-1361
This section provides an insight into the vulnerability specifics.
Vulnerability Description
By sending crafted TCP packets to a specific IP address, an attacker can exploit the misconfigured port to perform unauthorized file actions, including sensitive data manipulation.
Affected Systems and Versions
Cisco Nexus 3000 and 9000 Series Switches running Cisco NX-OS Software are affected by this vulnerability.
Exploitation Mechanism
Unauthorized access and manipulation of files are accomplished through crafted TCP packets sent to the targeted device's IP address.
Mitigation and Prevention
To mitigate the risks associated with CVE-2021-1361, consider the following steps.
Immediate Steps to Take
Regularly monitor and restrict network traffic to TCP port 9075, and implement proper access controls to limit external connections.
Long-Term Security Practices
Enforce the principle of least privilege, conduct routine security audits, and keep systems updated with the latest security patches to prevent similar exploits.
Patching and Updates
Apply relevant patches and updates provided by Cisco to address the vulnerability and enhance the security posture of the affected systems.