CVE-2022-20821 Explained : Impact and Mitigation
Learn about CVE-2022-20821, a vulnerability in Cisco IOS XR Software that enables unauthorized access to Redis, potentially leading to database manipulation and filesystem compromise. Find mitigation steps here.
A vulnerability in the health check RPM of Cisco IOS XR Software allows an unauthenticated remote attacker to access the Redis instance within the NOSi container. The vulnerability arises from the health check RPM opening TCP port 6379, potentially enabling attackers to manipulate the Redis database and filesystem.
Understanding CVE-2022-20821
This section delves into the details of the CVE-2022-20821 vulnerability in Cisco IOS XR Software.
What is CVE-2022-20821?
The vulnerability in the health check RPM of Cisco IOS XR Software permits unauthorized remote access to the Redis instance in the NOSi container. Exploitation could lead to unauthorized database modifications and access to the filesystem.
The Impact of CVE-2022-20821
The vulnerability poses a medium severity risk with a CVSS base score of 6.5. While it allows unauthorized access to the Redis instance, it does not immediately compromise system integrity or execute remote code.
Technical Details of CVE-2022-20821
This section covers the technical aspects of the CVE-2022-20821 vulnerability.
Vulnerability Description
The health check RPM flaw in Cisco IOS XR Software opens TCP port 6379, facilitating unauthorized access to the Redis instance within the NOSi container.
Affected Systems and Versions
The vulnerability affects Cisco IOS XR Software, but specific version details are not provided.
Exploitation Mechanism
Attackers exploit this vulnerability by connecting to the Redis instance on the open port, allowing unauthorized data manipulation and access to the filesystem.
Mitigation and Prevention
Here are the steps to mitigate and prevent exploitation of CVE-2022-20821.
Immediate Steps to Take
It is strongly advised to apply workarounds suggested by Cisco or upgrade to a fixed software release to address this vulnerability.
Long-Term Security Practices
Implementing network segmentation, access controls, and regular security updates can enhance overall system security.
Patching and Updates
Regularly monitor vendor advisories and apply patches promptly to protect systems from known vulnerabilities.