8 Proven Strategies to Secure MongoDB and Prevent Ransomware

Background

Recent ransomware incidents targeting MongoDB instances have raised concerns about the database’s security. This article shares a comprehensive set of strategies used by 360 DBA to harden MongoDB deployments and protect them from extortion.

Eight Steps to Prevent Ransomware

1. Change the Default Port

MongoDB’s default port is 27017, which attackers often scan for. Switching to a non‑standard port makes automated scans less effective and raises the difficulty for attackers.

2. Block Public Access

Expose MongoDB only on internal networks. By disabling public‑facing ports, you reduce exposure to mass scanning and limit attack vectors to internal traffic.

3. Run as a Non‑Root User

Running the database process under a non‑root account prevents privilege escalation if a vulnerability (e.g., the Redis exploit) is leveraged, limiting potential damage.

4. Enable Authentication

Activate MongoDB’s authentication (using the recommended keyFile method). Without authentication, a compromised instance is equivalent to an immune‑deficient system.

5. Enforce Strict Permission Controls

Implement granular role‑based access controls to prevent accidental data loss or unauthorized operations caused by “hand‑wave” incidents.

6. Adopt a Robust Backup Strategy

Use a combination of real‑time incremental backups and scheduled full dumps or copy‑based backups, tailored to data volume. Options include:

Incremental + daily dump for small workloads.

Incremental + daily copy for larger datasets.

Incremental + selective table/collection backup for log‑heavy clusters.

Incremental + daily backup + delayed replica for mission‑critical data.

All backups should be stored off‑site to survive data‑center disasters.

7. Define a Comprehensive Recovery Plan

Prepare recovery procedures for various scenarios, such as:

Incremental restore for small data loss.

Filtered restore of specific databases or collections.

Full restore to a point‑in‑time before the incident.

Deploying a temporary instance from backup for massive datasets.

Failover to a delayed replica when available.

8. Encrypt Sensitive Data at Rest

Encrypt passwords, emails, addresses, and other confidential fields before storing them, adding a second layer of protection even if the database is compromised.

Conclusion

Database security is a combination of proper configuration, network isolation, system hardening, backup/recovery planning, and data protection. While no measure can guarantee absolute safety, applying these eight practices significantly reduces the risk of ransomware and other attacks on MongoDB.