CVE-2021-37842 : Vulnerability Insights and Analysis

Couchbase Server 7.0.0's metakv uses Cleartext for Storage of Sensitive Information, potentially leaking Remote Cluster XDCR credentials in debug logs. Learn about the impact, technical details, and mitigation steps for this CVE.

Understanding CVE-2021-37842

A vulnerability in Couchbase Server 7.0.0 that exposes sensitive information stored in metakv to potential leakage. The issue arises from the storage mechanism and can lead to the exposure of Remote Cluster XDCR credentials in debug logs.

What is CVE-2021-37842?

In Couchbase Server 7.0.0, metakv utilizes Cleartext for Storage of Sensitive Information, which can result in the inadvertent exposure of Remote Cluster XDCR credentials in debug logs. The addition of a config key, tombstone purging, in this version inadvertently leads to this security risk.

The Impact of CVE-2021-37842

The vulnerability allows unauthorized access to sensitive data, particularly the leakage of Remote Cluster XDCR credentials, which could be exploited by malicious actors to compromise data integrity and confidentiality.

Technical Details of CVE-2021-37842

The technical aspects of the vulnerability include:

Vulnerability Description

metakv in Couchbase Server 7.0.0's utilization of Cleartext for Sensitive Information Storage, exposing Remote Cluster XDCR credentials in debug logs.

Affected Systems and Versions

Couchbase Server 7.0.0 is identified as the affected version in which this vulnerability exists due to the storage mechanism in metakv.

Exploitation Mechanism

The issue arises when a config key with a tombstone purger timestamp attached to it gets logged, potentially leading to the leakage of sensitive information.

Mitigation and Prevention

To mitigate the risks associated with CVE-2021-37842, consider the following:

Immediate Steps to Take

Regularly monitor debug logs related to XDCR and immediately revoke any leaked credentials. Review and update configurations to avoid storing sensitive information in plaintext.

Long-Term Security Practices

Establish secure storage practices for sensitive information and implement encryption mechanisms to protect data at rest and in transit. Conduct regular security audits to identify and address vulnerabilities.

Patching and Updates

Ensure timely installation of patches and updates released by Couchbase to address this specific vulnerability and enhance overall security posture.