Alibaba > ECS >

Open DNS

MEDIUM

Source

CloudSploit

open-dns

management console

Open DNS

Ensure that security groups does not have TCP or UDP port 53 for DNS open to the public.

While some ports such as HTTP and HTTPS are required to be open to the public to function properly, more sensitive services such as DNS should be restricted to known IP addresses.

Recommended Actions

Restrict TCP and UDP port 53 to known IP addresses

Links

https://www.alibabacloud.com/help/doc-detail/25471.htm

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