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RHSA-2009:1648: ntp security update

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RHSA-2009:1648: ntp security update

Severity
6
CVSS
(AV:N/AC:L/Au:N/C:N/I:P/A:P)
Published
12/09/2009
Created
07/25/2018
Added
12/09/2009
Modified
07/04/2017

Description

The Network Time Protocol (NTP) is used to synchronize a computer's timewith a referenced time source.Robin Park and Dmitri Vinokurov discovered a flaw in the way ntpd handledcertain malformed NTP packets. ntpd logged information about all suchpackets and replied with an NTP packet that was treated as malformed whenreceived by another ntpd. A remote attacker could use this flaw to createan NTP packet reply loop between two ntpd servers via a malformed packetwith a spoofed source IP address and port, causing ntpd on those servers touse excessive amounts of CPU time and fill disk space with log messages.(CVE-2009-3563)All ntp users are advised to upgrade to this updated package, whichcontains a backported patch to resolve this issue. After installing theupdate, the ntpd daemon will restart automatically.

Solution(s)

  • redhat-upgrade-ntp

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