NTP: Denial of Service

NTP: Denial of Service A Denial of Service condition in ntpd can cause excessive CPU or bandwidth consumption. ntp January 03, 2010 January 03, 2010: 01 290881 remote 4.2.4_p7-r1 4.2.4_p7-r1

NTP is a set of the Network Time Protocol programs.

Robin Park and Dmitri Vinokurov discovered that ntp_request.c in ntpd does not handle MODE_PRIVATE packets correctly, causing a continuous exchange of MODE_PRIVATE error responses between two NTP daemons or causing high CPU load on a single host.

A remote, unauthenticated attacker could send a specially crafted MODE_PRIVATE packet, allowing for a Denial of Service condition (CPU and bandwidth consumption).

There is no known workaround at this time.

All NTP users should upgrade to the latest version:


    # emerge --sync
    # emerge --ask --oneshot --verbose ">=net-misc/ntp-4.2.4_p7-r1"

CVE-2009-3563 craig craig craig