CIS Ubuntu 14.04 LTS - 2.2.17 Ensure NIS Server is not enabled

DevOps & Security

Verify that NIS (ypserv) server is disabled when not required

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Source SKILL.md: https://github.com/CyberStrikeus/CyberStrike/blob/HEAD/.cyberstrike/skill/CIS_benchmarks/Operating_Systems/Ubuntu/CIS_Ubuntu_Linux_14.04_LTS_Benchmark_v2.1.0/cis-ubuntu1404-v210-2-2-17/SKILL.md

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2.2.17 Ensure NIS Server is not enabled (Scored)

Profile Applicability

Level 1 - Server
Level 1 - Workstation

Description

The Network Information Service (NIS) (formally known as Yellow Pages) is a client-server directory service protocol for distributing system configuration files. The NIS server is a collection of programs that allow for the distribution of configuration files.

Rationale

The NIS service is inherently an insecure system that has been vulnerable to DOS attacks, buffer overflows and has poor authentication for querying NIS maps. NIS generally been replaced by such protocols as Lightweight Directory Access Protocol (LDAP). It is recommended that the service be disabled and other, more secure services be used.

Audit Procedure

Run the following commands to verify no start conditions listed for ypserv:

initctl show-config ypserv

Verify the output shows ypserv with no start conditions.

Expected Result

The ypserv service should have no start conditions listed.

Remediation

Remove or comment out start lines in /etc/init/ypserv.conf:

#start on (started portmap ON_BOOT=
#         or (started portmap ON_BOOT=y
#              and ((filesystem and static-network-up) or failsafe-boot)))

Default Value

NIS server is not enabled by default.

References

CIS Controls: 9.1 Limit Open Ports, Protocols, and Services

Profile

Level 1 - Server
Level 1 - Workstation