Daemons linked to TCP Wrappers eat 100% CPU when a line in /etc/hosts.allow or /etc/hosts.deny exceeds 2048 bytes

Solution Verified - Updated -

Issue

  • Daemons linked to TCP Wrappers eat 100% CPU when a line in hosts.allow or hosts.deny exceeds 2048 bytes
  • Ssh/snmp/vsftp daemon suddenly reached 99% of CPU utilization, the server got hang.

Environment

  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 5
  • tcp_wrappers

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