CVE-2019-11495 : What You Need to Know

Couchbase Server 5.1.1 had a vulnerability in the generation of intra-node communication cookies, allowing unauthorized code execution. The issue was resolved in version 6.0.0.

Understanding CVE-2019-11495

This CVE highlights a security flaw in the generation of cookies for intra-node communication in Couchbase Server 5.1.1.

What is CVE-2019-11495?

In Couchbase Server 5.1.1, the cookie generation process for intra-node communication was not secure. The server used erlang:now() to create the cookie, leading to a limited search space for random seeds, enabling brute-force attacks and unauthorized code execution on remote systems.

The Impact of CVE-2019-11495

The vulnerability allowed attackers to potentially execute unauthorized code on remote systems, posing a significant security risk to affected environments.

Technical Details of CVE-2019-11495

This section provides detailed technical insights into the vulnerability.

Vulnerability Description

The issue stemmed from the insecure generation of cookies for intra-node communication, making it susceptible to brute-force attacks.

Affected Systems and Versions

Affected System: Couchbase Server 5.1.1
Resolved Version: 6.0.0

Exploitation Mechanism

Attackers could exploit the limited search space for random seeds in the cookie generation process to brute-force the cookie and execute unauthorized code remotely.

Mitigation and Prevention

Protecting systems from similar vulnerabilities is crucial for maintaining security.

Immediate Steps to Take

Upgrade to Couchbase Server version 6.0.0 to mitigate the vulnerability.
Monitor for any unauthorized access or unusual activities on the network.

Long-Term Security Practices

Implement secure coding practices to prevent similar vulnerabilities in the future.
Regularly update and patch software to address security flaws.

Patching and Updates

Ensure timely installation of security patches and updates to stay protected from known vulnerabilities.