The sudo command must require authentication.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-218107	RHEL-06-000529	SV-218107r505923_rule		Medium

Description
The "sudo" command allows authorized users to run programs (including shells) as other users, system users, and root. The "/etc/sudoers" file is used to configure authorized "sudo" users as well as the programs they are allowed to run. Some configuration options in the "/etc/sudoers" file allow configured users to run programs without re-authenticating. Use of these configuration options makes it easier for one compromised account to be used to compromise other accounts.

Description

The "sudo" command allows authorized users to run programs (including shells) as other users, system users, and root. The "/etc/sudoers" file is used to configure authorized "sudo" users as well as the programs they are allowed to run. Some configuration options in the "/etc/sudoers" file allow configured users to run programs without re-authenticating. Use of these configuration options makes it easier for one compromised account to be used to compromise other accounts.

STIG	Date
Red Hat Enterprise Linux 6 Security Technical Implementation Guide	2020-09-03

Details

Check Text ( C-19588r499429_chk )
Verify neither the "NOPASSWD" option nor the "!authenticate" option is configured for use in "/etc/sudoers" and associated files. Note that the "#include" and "#includedir" directives may be used to include configuration data from locations other than the defaults enumerated here. # egrep '^[^#]NOPASSWD' /etc/sudoers /etc/sudoers.d/ # egrep '^[^#]!authenticate' /etc/sudoers /etc/sudoers.d/ If any occurrences of "NOPASSWD" or “!authenticate” are returned from these commands and have not been documented with the Information System Security Officer (ISSO) as an organizationally defined administrative group utilizing MFA, this is a finding.

Check Text ( C-19588r499429_chk )

Verify neither the "NOPASSWD" option nor the "!authenticate" option is configured for use in "/etc/sudoers" and associated files. Note that the "#include" and "#includedir" directives may be used to include configuration data from locations other than the defaults enumerated here.

# egrep '^[^#]*NOPASSWD' /etc/sudoers /etc/sudoers.d/*
# egrep '^[^#]*!authenticate' /etc/sudoers /etc/sudoers.d/*

If any occurrences of "NOPASSWD" or “!authenticate” are returned from these commands and have not been documented with the Information System Security Officer (ISSO) as an organizationally defined administrative group utilizing MFA, this is a finding.

Fix Text (F-19586r499430_fix)
Update the "/etc/sudoers" or other sudo configuration files to remove or comment out lines utilizing the "NOPASSWD" and "!authenticate" options. # visudo # visudo -f [other sudo configuration file]