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🛡️ Azure SQL Database allows ingress from 0.0.0.0/0 (ANY IP)🟢

  • Contextual name: 🛡️ Database allows ingress from 0.0.0.0/0 (ANY IP)🟢
  • ID: /ce/ca/azure/sql-database/disable-database-allows-ingress-from-any-ip-rule
  • Tags:
  • Policy Type: COMPLIANCE_POLICY
  • Policy Categories: SECURITY

Logic​

Similar Policies​

Similar Internal Rules​

RulePoliciesFlags
✉️ dec-x-0289e9c91

Description​

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Description​

Ensure that no SQL Databases allow ingress from 0.0.0.0/0 (any IP).

Rationale​

Azure SQL Server includes a firewall to block access to unauthorized connections. More granular IP addresses can be defined by referencing the range of addresses available from specific datacenters.

By default, for a SQL server, a firewall exists with StartIp of 0.0.0.0 and EndIP of 0.0.0.0 allowing access to all Azure services.

Additionally, a custom rule can be set up with StartIp of 0.0.0.0 and EndIP of 255.255.255.255 allowing access from any IP over the Internet.

In order to reduce the potential attack surface for a SQL server, firewall rules should be defined with more granular IP addresses by referencing the range of addresses available from specific datacenters.

If Allow Azure services and resources to access this server is checked, this allows resources outside the subscription or tenant boundary, within any Azure region, to bypass the SQL Server network ACL on the public endpoint. A malicious attacker can launch a SQL server password brute-force attack by creating a virtual machine in any Azure subscription or region, outside the subscription boundary where the SQL Server is located.

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Remediation​

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Remediation​

From Azure Portal​

  1. Go to SQL servers.
  2. For each SQL server:
  3. Under Security, click Networking.
  4. Uncheck Allow Azure services and resources to access this server.
  5. Set firewall rules to limit access to only authorized connections.
  6. Click Save.

From Azure CLI​

Disable the default firewall rule Allow access to Azure services:

az sql server firewall-rule delete \
    --resource-group {{resource-group-name}} \
    --server {{sql-server-name}} \
    --name "AllowAllWindowsAzureIps"

Remove a custom firewall rule:

az sql server firewall-rule delete \
    --resource-group {{resource-group-name}} \
    --server {{sql-server-name}} \
    --name {{firewall-rule-name}}

Create a firewall rule:

az sql server firewall-rule create \
    --resource-group {{resource-group-name}} \
    --server {{sql-server-name}} \
    --name {{firewall-rule-name}} \
    --start-ip-address "{{ip-address-other-than-0-0-0-0}}" \
    --end-ip-address "{{ip-address-other-than-0-0-0-0-or-255-255-255-255}}"

Update a firewall rule:

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policy.yaml​

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Linked Framework Sections​

SectionSub SectionsInternal RulesPoliciesFlagsCompliance
💼 APRA CPG 234 → 💼 36d access management controls —only authorised users, software and hardware are able to access information assets (refer to Attachment B for further guidance);1414no data
💼 APRA CPG 234 → 💼 36e hardware and software asset controls —appropriate authorisation to prevent security compromises from unauthorised hardware and software assets;1616no data
💼 APRA CPG 234 → 💼 36f network design — to ensure authorised network traffic flows and to reduce the impact of security compromises;2930no data
💼 APRA CPG 234 → 💼 45 An understanding of plausible worst case scenarios can help regulated entities identify and implement additional controls to prevent or reduce the impact of such scenarios. One example is malware that infects computers and encrypts data, both on the infected computer and any connected storage, including (corporate) networks and cloud storage. Such attacks reinforce the importance of protecting the backup environment in the event that the production environment is compromised. Common techniques to achieve this include network segmentation, highly restricted and segregated access controls and network traffic flow restrictions.3537no data
💼 APRA CPG 234 → 💼 52d appropriate segmentation of data, based on sensitivity and access needs;1010no data
💼 APRA CPG 234 → 💼 53 Wholesale access to sensitive data (e.g. contents of customer databases or intellectual property that can be exploited for personal gain) would be highly restricted to reduce the risk exposure to significant data leakage events. Industry experience of actual data leakage incidents include the unauthorised extraction of debit/credit card details, theft of personally identifiable information, loss of unencrypted backup media and the sale/trade or exploitation of customer identity data.1010no data
💼 CIS Azure v1.1.0 → 💼 6.3 Ensure no SQL Databases allow ingress 0.0.0.0/0 (ANY IP)11no data
💼 CIS Azure v1.3.0 → 💼 6.3 Ensure no SQL Databases allow ingress 0.0.0.0/0 (ANY IP) - Level 1 (Automated).11no data
💼 CIS Azure v1.4.0 → 💼 6.3 Ensure no SQL Databases allow ingress 0.0.0.0/0 (ANY IP) - Level 1 (Automated).11no data
💼 CIS Azure v1.5.0 → 💼 4.1.2 Ensure no Azure SQL Databases allow ingress from 0.0.0.0/0 (ANY IP) - Level 1 (Automated)11no data
💼 CIS Azure v2.0.0 → 💼 4.1.2 Ensure no Azure SQL Databases allow ingress from 0.0.0.0/0 (ANY IP) - Level 1 (Automated)11no data
💼 CIS Azure v2.1.0 → 💼 4.1.2 Ensure no Azure SQL Databases allow ingress from 0.0.0.0/0 (ANY IP) - Level 1 (Automated)11no data
💼 CIS Azure v3.0.0 → 💼 5.1.2 Ensure no Azure SQL Databases allow ingress from 0.0.0.0/0 (ANY IP) (Automated)1no data
💼 Cloudaware Framework → 💼 Network Exposure132no data
💼 FedRAMP High Security Controls → 💼 AC-4(21) Physical or Logical Separation of Information Flows (M)(H)1163no data
💼 FedRAMP Moderate Security Controls → 💼 AC-4(21) Physical or Logical Separation of Information Flows (M)(H)63no data
💼 ISO/IEC 27001:2013 → 💼 A.9.1.2 Access to networks and network services1718no data
💼 ISO/IEC 27001:2013 → 💼 A.9.4.1 Information access restriction1920no data
💼 ISO/IEC 27001:2022 → 💼 5.10 Acceptable use of information and other associated assets1127no data
💼 ISO/IEC 27001:2022 → 💼 5.15 Access control1431no data
💼 ISO/IEC 27001:2022 → 💼 8.3 Information access restriction1024no data
💼 ISO/IEC 27001:2022 → 💼 8.4 Access to source code822no data
💼 NIST CSF v1.1 → 💼 PR.AC-4: Access permissions and authorizations are managed, incorporating the principles of least privilege and separation of duties1756no data
💼 NIST CSF v1.1 → 💼 PR.AC-7: Users, devices, and other assets are authenticated (e.g., single-factor, multi-factor) commensurate with the risk of the transaction (e.g., individuals' security and privacy risks and other organizational risks)1923no data
💼 NIST CSF v1.1 → 💼 PR.DS-5: Protections against data leaks are implemented4791no data
💼 NIST CSF v1.1 → 💼 PR.PT-3: The principle of least functionality is incorporated by configuring systems to provide only essential capabilities2130no data
💼 NIST CSF v2.0 → 💼 PR.AA-03: Users, services, and hardware are authenticated53no data
💼 NIST CSF v2.0 → 💼 PR.AA-05: Access permissions, entitlements, and authorizations are defined in a policy, managed, enforced, and reviewed, and incorporate the principles of least privilege and separation of duties133no data
💼 NIST CSF v2.0 → 💼 PR.DS-01: The confidentiality, integrity, and availability of data-at-rest are protected187no data
💼 NIST CSF v2.0 → 💼 PR.DS-02: The confidentiality, integrity, and availability of data-in-transit are protected160no data
💼 NIST CSF v2.0 → 💼 PR.DS-10: The confidentiality, integrity, and availability of data-in-use are protected184no data
💼 NIST SP 800-53 Revision 5 → 💼 AC-4(21) Information Flow Enforcement _ Physical or Logical Separation of Information Flows3763no data
💼 PCI DSS v3.2.1 → 💼 1.1 Establish and implement firewall and router configuration standards7139no data
💼 PCI DSS v3.2.1 → 💼 1.2.1 Restrict inbound and outbound traffic to that which is necessary for the cardholder data environment, and specifically deny all other traffic.1065no data
💼 PCI DSS v3.2.1 → 💼 1.3 Prohibit direct public access between the Internet and any system component in the cardholder data environment.7842no data
💼 PCI DSS v3.2.1 → 💼 1.3.1 Implement a DMZ to limit inbound traffic to only system components that provide authorized publicly accessible services, protocols, and ports.628no data
💼 PCI DSS v3.2.1 → 💼 1.3.2 Limit inbound Internet traffic to IP addresses within the DMZ.28no data
💼 PCI DSS v3.2.1 → 💼 1.3.5 Permit only “established” connections into the network.28no data
💼 PCI DSS v4.0.1 → 💼 1.2.1 Configuration standards for NSC rulesets are defined, implemented, maintained.34no data
💼 PCI DSS v4.0.1 → 💼 1.3.1 Inbound traffic to the CDE is restricted.65no data
💼 PCI DSS v4.0.1 → 💼 1.3.2 Outbound traffic from the CDE is restricted.65no data
💼 PCI DSS v4.0.1 → 💼 1.4.1 NSCs are implemented between trusted and untrusted networks.19no data
💼 PCI DSS v4.0.1 → 💼 1.4.2 Inbound traffic from untrusted networks to trusted networks is restricted.28no data
💼 PCI DSS v4.0 → 💼 1.2.1 Configuration standards for NSC rulesets are defined, implemented, maintained.2434no data
💼 PCI DSS v4.0 → 💼 1.3.1 Inbound traffic to the CDE is restricted.765no data
💼 PCI DSS v4.0 → 💼 1.3.2 Outbound traffic from the CDE is restricted.65no data
💼 PCI DSS v4.0 → 💼 1.4.1 NSCs are implemented between trusted and untrusted networks.719no data
💼 PCI DSS v4.0 → 💼 1.4.2 Inbound traffic from untrusted networks to trusted networks is restricted.728no data
💼 SOC 2 → 💼 CC6.1-6 Manages Points of Access57no data
💼 SOC 2 → 💼 CC6.1-8 Manages Identification and Authentication1824no data
💼 UK Cyber Essentials → 💼 1.2 Prevent access to the administrative interface from the internet3638no data