Check: RHEL-07-031010
RHEL 7 STIG:
RHEL-07-031010
(in versions v3 r15 through v2 r1)
Title
The Red Hat Enterprise Linux operating system must be configured so that the rsyslog daemon does not accept log messages from other servers unless the server is being used for log aggregation. (Cat II impact)
Discussion
Unintentionally running a rsyslog server accepting remote messages puts the system at increased risk. Malicious rsyslog messages sent to the server could exploit vulnerabilities in the server software itself, could introduce misleading information in to the system's logs, or could fill the system's storage leading to a Denial of Service. If the system is intended to be a log aggregation server its use must be documented with the ISSO.
Check Content
Verify that the system is not accepting "rsyslog" messages from other systems unless it is documented as a log aggregation server. Check the configuration of "rsyslog" with the following command: # grep imtcp /etc/rsyslog.conf $ModLoad imtcp # grep imudp /etc/rsyslog.conf $ModLoad imudp # grep imrelp /etc/rsyslog.conf $ModLoad imrelp If any of the above modules are being loaded in the "/etc/rsyslog.conf" file, ask to see the documentation for the system being used for log aggregation. If the documentation does not exist, or does not specify the server as a log aggregation system, this is a finding.
Fix Text
Modify the "/etc/rsyslog.conf" file to remove the "ModLoad imtcp", "ModLoad imudp", and "ModLoad imrelp" configuration lines, or document the system as being used for log aggregation.
Additional Identifiers
Rule ID: SV-204575r991589_rule
Vulnerability ID: V-204575
Group Title: SRG-OS-000480-GPOS-00227
Expert Comments
CCIs
| Number | Definition |
|---|---|
| CCI-000318 |
Monitor and review activities associated with configuration-controlled changes to the system. |
| CCI-000368 |
Document any deviations from the established configuration settings for organization-defined system components based on organization-defined operational requirements. |
| CCI-001812 |
The information system prohibits user installation of software without explicit privileged status. |
| CCI-001813 |
Enforce access restrictions using organization-defined mechanisms. |
| CCI-001814 |
The Information system supports auditing of the enforcement actions. |