GLSA-201001-01 : NTP: Denial of Service
Medium Nessus Plugin ID 44890
SynopsisThe remote Gentoo host is missing one or more security-related patches.
DescriptionThe remote host is affected by the vulnerability described in GLSA-201001-01 (NTP: Denial of Service)
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.
SolutionAll NTP users should upgrade to the latest version:
# emerge --sync # emerge --ask --oneshot --verbose '>=net-misc/ntp-4.2.4_p7-r1'