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kaandgnshkaandgnsh/Claude-Blue/skills/database-security/db-hardening/SKILL.md

db-hardening

Skill0 starsChanged 11 days agoMITView on GitHub

Harden database servers and managed databases — network exposure, TLS, authentication methods (pg_hba, SQL auth vs. Windows/Entra), dangerous features (xp_cmdshell, COPY PROGRAM, LOAD DATA LOCAL), encryption at rest/TDE, patching, backups encryption — against CIS benchmarks. Use when deploying or reviewing a database, after finding an internet-exposed database, or remediating database benchmark findings.

The file

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1 rule. About 0 are common, 0 are distinctive, and 1 is very specific to this project.

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  • Distinctive
  • Very specific
  1. Very specific:

    Not internet-reachable; private subnets/endpoints only (cloud-exposure-review: PubliclyAccessible, public IP on Azure SQL/Cloud SQL, open …

    line 15

≈ “Common” is an estimate: at least 1 in 5 of the 350,495 skill files we read have a rule of the same kind, not the same words. “Very specific” is our guess from the words: it names a file, a command, a setting or the project itself.

Keep what fits and drop the rest. Your version, ready for your agents.
Files
SKILL.md

Database Hardening

Exposure and network

  • Not internet-reachable; private subnets/endpoints only (cloud-exposure-review: PubliclyAccessible, public IP on Azure SQL/Cloud SQL, open 1433/3306/5432/27017/6379/9200).
  • Host firewall / security groups restrict to app tiers and admin jump hosts.
  • NoSQL/search engines: authentication enabled (MongoDB security.authorization: enabled, Redis requirepass/ACLs + protected-mode yes, Elasticsearch security features on) — unauthenticated instances are mass-scanned and ransomed within hours.

Authentication & transport

  • PostgreSQL pg_hba.conf: hostssl + scram-sha-256, no trust, no 0.0.0.0/0 for admin roles; ssl = on; password_encryption = scram-sha-256.
  • SQL Server: Windows/Entra authentication preferred; if SQL auth, enforce policy; disable sa or rename + strong secret; force encryption.
  • MySQL: require_secure_transport=ON, caching_sha2_password, no anonymous users.

Dangerous features

EngineDisable/restrict
SQL Serverxp_cmdshell, Ole Automation Procedures, CLR (clr enabled/clr strict security), Ad Hoc Distributed Queries, cross-db ownership chaining — check with SELECT name, value_in_use FROM sys.configurations WHERE name IN ('xp_cmdshell','clr enabled','Ole Automation Procedures','Ad Hoc Distributed Queries');
PostgreSQLpg_execute_server_program/pg_read_server_files grants, untrusted languages (plpython3u) for non-admins, COPY ... PROGRAM
MySQLlocal_infile=OFF, secure_file_priv set to a dedicated dir or NULL, FILE privilege
OracleDefault accounts locked, UTL_* package grants to PUBLIC revoked

Data protection

Encryption at rest (TDE / managed storage encryption with KMS keys), encrypted backups with restricted access, masking in non-prod copies, audit logging (db-audit-logging).

Patch & version

Supported major versions only; track CVEs for the engine; managed services' maintenance windows enabled.

Related skills

db-privilege-review, db-audit-logging, cloud-exposure-review, linux-hardening

References

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