Title

The audit system must be configured to audit modifications to the systems network configuration. (Cat III impact)

Discussion

The network environment should not be modified by anything other than administrator action. Any change to network parameters should be audited.

Check Content

If you are running x86_64 architecture, determine the values for sethostname: $ uname -m; ausyscall i386 sethostname; ausyscall x86_64 sethostname If the values returned are not identical verify that the system is configured to monitor network configuration changes for the i386 and x86_64 architectures: $ sudo egrep -w '(sethostname|setdomainname|/etc/issue|/etc/issue.net|/etc/hosts|/etc/sysconfig/network)' /etc/audit/audit.rules -a always,exit -F arch=b32 -S sethostname -S setdomainname -k audit_network_modifications -a always,exit -F arch=b64 -S sethostname -S setdomainname -k audit_network_modifications -w /etc/issue -p wa -k audit_network_modifications -w /etc/issue.net -p wa -k audit_network_modifications -w /etc/hosts -p wa -k audit_network_modifications -w /etc/sysconfig/network -p wa -k audit_network_modifications If the system is 64-bit and does not return a rule for both "b32" and "b64" architectures, this is a finding. If the system is not configured to audit changes of the network configuration, this is a finding.

Fix Text

Add the following to "/etc/audit/audit.rules": # audit_network_modifications -a always,exit -F arch=b32 -S sethostname -S setdomainname -k audit_network_modifications -w /etc/issue -p wa -k audit_network_modifications -w /etc/issue.net -p wa -k audit_network_modifications -w /etc/hosts -p wa -k audit_network_modifications -w /etc/sysconfig/network -p wa -k audit_network_modifications If the system is 64-bit, then also add the following: -a always,exit -F arch=b64 -S sethostname -S setdomainname -k audit_network_modifications

Additional Identifiers

Rule ID: SV-217960r603264_rule

Vulnerability ID: V-217960

Group Title: SRG-OS-000480

Expert Comments

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