Detections
Analytics

4.1.6 Ensure events that modify the system's network environment are collected - /etc/hosts - audit.rules

Warning! Audit Deprecated

This audit has been deprecated and will be removed in a future update.

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Information

Monitoring sethostname and setdomainname will identify potential unauthorized changes to host and domainname of a system. The changing of these names could potentially break security parameters that are set based on those names. The /etc/hosts file is monitored for changes in the file that can indicate an unauthorized intruder is trying to change machine associations with IP addresses and trick users and processes into connecting to unintended machines. Monitoring /etc/issue and /etc/issue.net is important, as intruders could put disinformation into those files and trick users into providing information to the intruder. Monitoring /etc/sysconfig/network is important as it can show if network interfaces or scripts are being modified in a way that can lead to the machine becoming unavailable or compromised. All audit records will be tagged with the identifier 'system-locale.'

Solution

For 32 bit systems add the following lines to the /etc/audit/audit.rules file:
 -a always,exit -F arch=b32 -S sethostname -S setdomainname -k system-locale
 -w /etc/issue -p wa -k system-locale
 -w /etc/issue.net -p wa -k system-locale
 -w /etc/hosts -p wa -k system-locale
 -w /etc/sysconfig/network -p wa -k system-locale
 For 64 bit systems add the following lines to the /etc/audit/audit.rules file:
 -a always,exit -F arch=b64 -S sethostname -S setdomainname -k system-locale
 -a always,exit -F arch=b32 -S sethostname -S setdomainname -k system-locale
 -w /etc/issue -p wa -k system-locale
 -w /etc/issue.net -p wa -k system-locale
 -w /etc/hosts -p wa -k system-locale
 -w /etc/sysconfig/network -p wa -k system-locale

See Also

https://workbench.cisecurity.org/files/1859

Item Details

Category: AUDIT AND ACCOUNTABILITY

References: 800-53|AU-12, CSCv6|3.6

Plugin: Unix

Control ID: 983c3f0ebd4ee00ece1ce644312171a6ff65b887a1136512a32b8d0ae877b924