CCE-90724-6Platform: rhel7,centos7 | Date: (C)2017-06-29 (M)2022-10-10 |
Check Avahi Responses' TTL Field
To make Avahi ignore packets unless the TTL field is 255, edit
'/etc/avahi/avahi-daemon.conf' and ensure the following line
appears in the '[server]' section:
'check-response-ttl=yes'
Parameter:
Technical Mechanism:
This helps to ensure that only mDNS responses from the local network are
processed, because the TTL field in a packet is decremented from its initial
value of 255 whenever it is routed from one network to another. Although
Aproperly-configured router or firewall should not allow mDNS packets into
the local network at all, this option provides another check to ensure they
are not permitted.
Fix:
No Remediation Info
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References: Resource Id | Reference |
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SCAP Repo OVAL Definition | oval:org.secpod.oval:def:30414 |
SCAP Repo OVAL Definition | oval:org.secpod.oval:def:31137 |