Inbound TCP NetBIOS access should be restricted

문서 > Datadog 보안 > OOTB Rules > Inbound TCP NetBIOS access should be restricted

이 페이지는 아직 한국어로 제공되지 않으며 번역 작업 중입니다. 번역에 관한 질문이나 의견이 있으시면 언제든지 저희에게 연락해 주십시오.

Description

Reduce the probability of a breach by checking EC2 security groups for inbound rules that allow unfettered access to TCP port 139 (used by services for NetBIOS name resolution) and restrict access to IP addresses that require this port.

Rationale

Malicious activity, such as bad tunnel exploits or denial-of-service (DoS) and man-in-the-middle (MITM) attacks, can occur when permitting unfettered access to this port.

Remediation

From the console

Follow the Security group rules docs to learn how to add a security group rule that will restrict access to a specific port.

From the command line

Run revoke-security-group-ingress to remove inbound rules that allow unrestricted access to TCP port 139.

revoke-security-group-ingress.sh

    aws ec2 revoke-security-group-ingress
        --group-name group-name
        --protocol tcp
        --port 139
        --cidr 192.0.2.0/24
    