RHEL 4 / 5 : ntp (RHSA-2009:1648)

This script is Copyright (C) 2009-2014 Tenable Network Security, Inc.


Synopsis :

The remote Red Hat host is missing a security update.

Description :

An updated ntp package that fixes a security issue is now available
for Red Hat Enterprise Linux 4 and 5.

This update has been rated as having moderate security impact by the
Red Hat Security Response Team.

The Network Time Protocol (NTP) is used to synchronize a computer's
time with a referenced time source.

Robin Park and Dmitri Vinokurov discovered a flaw in the way ntpd
handled certain malformed NTP packets. ntpd logged information about
all such packets and replied with an NTP packet that was treated as
malformed when received by another ntpd. A remote attacker could use
this flaw to create an NTP packet reply loop between two ntpd servers
via a malformed packet with a spoofed source IP address and port,
causing ntpd on those servers to use 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, which
contains a backported patch to resolve this issue. After installing
the update, the ntpd daemon will restart automatically.

See also :

https://www.redhat.com/security/data/cve/CVE-2009-3563.html
http://rhn.redhat.com/errata/RHSA-2009-1648.html

Solution :

Update the affected ntp package.

Risk factor :

Medium / CVSS Base Score : 6.4
(CVSS2#AV:N/AC:L/Au:N/C:N/I:P/A:P)
Public Exploit Available : true

Family: Red Hat Local Security Checks

Nessus Plugin ID: 43080 ()

Bugtraq ID:

CVE ID: CVE-2009-3563