RHEL 6 / 7 : ISC DHCP Concurrent TCP Sessions DoS
High Nessus Plugin ID 90250
SynopsisThe remote host is affected by a denial of service vulnerability.
DescriptionRedHat Enterprise Linux 6 / 7 is affected by a denial of service vulnerability in the bundled ISC DHCP server due to a failure to properly restrict the number of concurrent TCP sessions to the ports the server uses for inter-process communications and control. An unauthenticated, remote attacker can exploit this, by opening a large number of TCP sessions, to cause the server to fail to process requests or to exit unexpectedly, or to cause an exhaustion of system sockets.
Note that this vulnerability is more easily exploited when the DHCP server is using OMAPI for remote management.
SolutionRestrict access to the DHCP server to trusted networks and peers only.
Note that RedHat, at this time, has deferred the fix for RedHat Enterprise Linux 6 / 7 to a later date.