Skip to main content

🛡️ AWS Lambda Function allows public access🟢

Logic​

Similar Policies​

Description​

Open File

Description​

This policy identifies AWS Lambda Functions whose resource-based policies allow access to all principals (*).

Rationale​

AWS Lambda functions are frequently used to process sensitive data or perform administrative operations. If a function’s resource-based policy grants lambda:InvokeFunction permission to the public, anyone on the internet can trigger the function. This may result in unexpected compute costs or the execution of logic that was never intended to be publicly accessible.

Public access to actions such as lambda:GetFunction can expose function configuration details, including environment variables, which often contain sensitive information such as database connection strings or API keys.

In more severe misconfigurations, allowing public access to lambda:UpdateFunctionCode could enable an attacker to replace the function’s code with malicious logic, potentially compromising downstream systems and data.

Audit​

This policy flags an AWS Lambda Function as INCOMPLIANT if its resource-based IAM Policy allows any of the following lambda: actions:

... see more

Remediation​

Open File

Remediation​

Remove Public Permissions from the Function​

From Command Line​

  1. Retrieve the resource-based policy and note the statement ID (Sid) that grants public access:

    aws lambda get-policy \
        --function-name {{function-name}} \
        --output text

  2. Remove the permission statement that grants access to all principals:

    aws lambda remove-permission \
        --function-name {{function-name}} \
        --statement-id {{sid}}

policy.yaml​

Open File

Linked Framework Sections​

SectionSub SectionsInternal RulesPoliciesFlagsCompliance
💼 AWS Foundational Security Best Practices v1.0.0 → 💼 [Lambda.1] Lambda function policies should prohibit public access1no data
💼 Cloudaware Framework → 💼 Public and Anonymous Access116no data
💼 FedRAMP High Security Controls → 💼 AC-3 Access Enforcement (L)(M)(H)3784no data
💼 FedRAMP High Security Controls → 💼 AC-4 Information Flow Enforcement (M)(H)237105no data
💼 FedRAMP High Security Controls → 💼 AC-4(21) Physical or Logical Separation of Information Flows (M)(H)1163no data
💼 FedRAMP High Security Controls → 💼 AC-6 Least Privilege (M)(H)81179no data
💼 FedRAMP High Security Controls → 💼 AC-21 Information Sharing (M)(H)19no data
💼 FedRAMP High Security Controls → 💼 SC-7 Boundary Protection (L)(M)(H)10884no data
💼 FedRAMP High Security Controls → 💼 SC-7(3) Access Points (M)(H)19no data
💼 FedRAMP High Security Controls → 💼 SC-7(4) External Telecommunications Services (M)(H)49no data
💼 FedRAMP High Security Controls → 💼 SC-7(20) Dynamic Isolation and Segregation (H)20no data
💼 FedRAMP High Security Controls → 💼 SC-7(21) Isolation of System Components (H)37no data
💼 FedRAMP Low Security Controls → 💼 AC-3 Access Enforcement (L)(M)(H)84no data
💼 FedRAMP Low Security Controls → 💼 SC-7 Boundary Protection (L)(M)(H)49no data
💼 FedRAMP Moderate Security Controls → 💼 AC-3 Access Enforcement (L)(M)(H)84no data
💼 FedRAMP Moderate Security Controls → 💼 AC-4 Information Flow Enforcement (M)(H)189no data
💼 FedRAMP Moderate Security Controls → 💼 AC-4(21) Physical or Logical Separation of Information Flows (M)(H)63no data
💼 FedRAMP Moderate Security Controls → 💼 AC-6 Least Privilege (M)(H)679no data
💼 FedRAMP Moderate Security Controls → 💼 AC-21 Information Sharing (M)(H)19no data
💼 FedRAMP Moderate Security Controls → 💼 SC-7 Boundary Protection (L)(M)(H)768no data
💼 FedRAMP Moderate Security Controls → 💼 SC-7(3) Access Points (M)(H)19no data
💼 FedRAMP Moderate Security Controls → 💼 SC-7(4) External Telecommunications Services (M)(H)49no data
💼 NIST CSF v2.0 → 💼 DE.CM-01: Networks and network services are monitored to find potentially adverse events180no data
💼 NIST CSF v2.0 → 💼 DE.CM-09: Computing hardware and software, runtime environments, and their data are monitored to find potentially adverse events181no data
💼 NIST CSF v2.0 → 💼 ID.AM-03: Representations of the organization's authorized network communication and internal and external network data flows are maintained89no 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 CSF v2.0 → 💼 PR.IR-01: Networks and environments are protected from unauthorized logical access and usage123no data
💼 NIST SP 800-53 Revision 5 → 💼 AC-3 Access Enforcement15559no data
💼 NIST SP 800-53 Revision 5 → 💼 AC-3(7) Access Enforcement _ Role-based Access Control31no data
💼 NIST SP 800-53 Revision 5 → 💼 AC-4 Information Flow Enforcement3269123no data
💼 NIST SP 800-53 Revision 5 → 💼 AC-4(21) Information Flow Enforcement _ Physical or Logical Separation of Information Flows3763no data
💼 NIST SP 800-53 Revision 5 → 💼 AC-6 Least Privilege102372no data
💼 NIST SP 800-53 Revision 5 → 💼 AC-21 Information Sharing219no data
💼 NIST SP 800-53 Revision 5 → 💼 SC-7 Boundary Protection29493no data
💼 NIST SP 800-53 Revision 5 → 💼 SC-7(3) Boundary Protection _ Access Points19no data
💼 NIST SP 800-53 Revision 5 → 💼 SC-7(4) Boundary Protection _ External Telecommunications Services49no data
💼 NIST SP 800-53 Revision 5 → 💼 SC-7(9) Boundary Protection _ Restrict Threatening Outgoing Communications Traffic34no data
💼 NIST SP 800-53 Revision 5 → 💼 SC-7(11) Boundary Protection _ Restrict Incoming Communications Traffic37no data
💼 NIST SP 800-53 Revision 5 → 💼 SC-7(16) Boundary Protection _ Prevent Discovery of System Components37no data
💼 NIST SP 800-53 Revision 5 → 💼 SC-7(20) Boundary Protection _ Dynamic Isolation and Segregation20no data
💼 NIST SP 800-53 Revision 5 → 💼 SC-7(21) Boundary Protection _ Isolation of System Components37no 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 → 💼 1.3.1 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 → 💼 1.3.4 Do not allow unauthorized outbound traffic from the cardholder data environment to the Internet.15no data
💼 PCI DSS v3.2.1 → 💼 1.3.5 Permit only “established” connections into the network.28no data
💼 PCI DSS v3.2.1 → 💼 7.1.1 Define access needs for each role.1no data
💼 PCI DSS v3.2.1 → 💼 7.2.1 Coverage of all system components.11no 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 → 💼 1.4.2 Inbound traffic from untrusted networks to trusted networks is restricted.28no data
💼 PCI DSS v4.0.1 → 💼 7.2.1 An access control model is defined and includes granting appropriate access.1no data
💼 PCI DSS v4.0.1 → 💼 7.3.1 An access control system(s) is in place that restricts access based on a user's need to know and covers all system components.11no 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 → 💼 1.4.2 Inbound traffic from untrusted networks to trusted networks is restricted.728no data
💼 PCI DSS v4.0 → 💼 7.2.1 An access control model is defined and includes granting appropriate access.1no data
💼 PCI DSS v4.0 → 💼 7.3.1 An access control system(s) is in place that restricts access based on a user's need to know and covers all system components.11no data