Title

Amazon Linux 2023 must not have the telnet-server package installed. (Cat II impact)

Discussion

It is detrimental for operating systems to provide, or install by default, functionality exceeding requirements or mission objectives. These unnecessary capabilities or services are often overlooked and therefore, may remain unsecured. They increase the risk to the platform by providing additional attack vectors. Operating systems are capable of providing a variety of functions and services. Some of the functions and services, provided by default, may not be necessary to support essential organizational operations (e.g., key missions, functions). Examples of nonessential capabilities include, but are not limited to, games, software packages, tools, and demonstration software, not related to requirements or providing a wide array of functionality not required for every mission, but which cannot be disabled.

Check Content

Verify Amazon Linux 2023 does not have the telnet-server package installed with the following command: $ dnf list --installed telnet-server Error: No matching Packages to list If the "telnet-server" package is installed, this is a finding.

Fix Text

Configure Amazon Linux 2023 to not have the telnet-server package installed with the following command: $ sudo dnf -y remove telnet-server

Additional Identifiers

Rule ID: SV-274010r1120018_rule

Vulnerability ID: V-274010

Group Title: SRG-OS-000095-GPOS-00049

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.