The read_from_cmd_socket function in cmdmon.c in chronyd in Chrony before 1.23.1, and 1.24-pre1, allows remote attackers to cause a denial of service (CPU and bandwidth consumption) by sending a spoofed cmdmon packet that triggers a continuous exchange of NOHOSTACCESS messages between two daemons, a related issue to CVE-2009-3563.
https://bugzilla.redhat.com/show_bug.cgi?id=555367
http://www.securityfocus.com/bid/38106
http://www.debian.org/security/2010/dsa-1992
http://secunia.com/advisories/38480