Title

RHEL 9 must authenticate the remote logging server for offloading audit logs via rsyslog. (Cat II impact)

Discussion

Information stored in one location is vulnerable to accidental or incidental deletion or alteration. Offloading is a common process in information systems with limited audit storage capacity. RHEL 9 installation media provides "rsyslogd", a system utility providing support for message logging. Support for both internet and Unix domain sockets enables this utility to support both local and remote logging. Coupling this utility with "gnutls" (a secure communications library implementing the SSL, TLS and DTLS protocols) creates a method to securely encrypt and offload auditing. "Rsyslog" supported authentication modes include: anon - anonymous authentication x509/fingerprint - certificate fingerprint authentication x509/certvalid - certificate validation only x509/name - certificate validation and subject name authentication Satisfies: SRG-OS-000342-GPOS-00133, SRG-OS-000479-GPOS-00224

Check Content

Verify RHEL 9 authenticates the remote logging server for offloading audit logs with the following command: $ grep -i 'StreamDriver[\.]*AuthMode' /etc/rsyslog.conf /etc/rsyslog.d/*.conf /etc/rsyslog.conf:$ActionSendStreamDriverAuthMode x509/name If the variable name "StreamDriverAuthMode" is present in an omfwd statement block, this is not a finding. However, if the "StreamDriverAuthMode" variable is in a module block, this is a finding. If the value of the "$ActionSendStreamDriverAuthMode or StreamDriver.AuthMode" option is not set to "x509/name" or the line is commented out, ask the system administrator (SA) to indicate how the audit logs are offloaded to a different system or media. If there is no evidence that the transfer of the audit logs being offloaded to another system or media is encrypted, this is a finding.

Fix Text

Configure RHEL 9 to authenticate the remote logging server for offloading audit logs by setting the following option in "/etc/rsyslog.conf" or "/etc/rsyslog.d/[customfile].conf": $ActionSendStreamDriverAuthMode x509/name

Additional Identifiers

Rule ID: SV-258146r1045288_rule

Vulnerability ID: V-258146

Group Title: SRG-OS-000342-GPOS-00133

Expert Comments

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