A new update is available for Fedora Core - [SECURITY] Fedora Core 3 Update: ntp-4.2.0.a.20040617-5.FC3. Here the announcement:

Fedora Update Notification
FEDORA-2005-812
2005-08-26
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Product : Fedora Core 3
Name : ntp
Version : 4.2.0.a.20040617
Release : 5.FC3
Summary : Synchronizes system time using the Network Time Protocol (NTP).
Description :
The Network Time Protocol (NTP) is used to synchronize a computer's
time with another reference time source. The ntp package contains
utilities and daemons that will synchronize your computer's time to
Coordinated Universal Time (UTC) via the NTP protocol and NTP servers.
The ntp package includes ntpdate (a program for retrieving the date
and time from remote machines via a network) and ntpd (a daemon which
continuously adjusts system time).

Install the ntp package if you need tools for keeping your system's
time synchronized via the NTP protocol.

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Update Information:

When starting xntpd with the -u option and specifying the
group by using a string not a numeric gid the daemon uses
the gid of the user not the group. This problem is now fixed
by this update.

The Common Vulnerabilities and Exposures project assigned
the name CAN-2005-2496 to this issue.
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* Fri Aug 26 2005 Jindrich Novy <jnovy@redhat.com> 4.2.0.a.20040617-5.FC3
- release update to fix CAN-2005-2496 (#147743)

* Thu Apr 14 2005 Jiri Ryska <jryska@redhat.com> - 4.2.0.a.20040617-4.FC3
- fixed gid setting when ntpd started with -u flag


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This update can be downloaded from:
http://download.fedora.redhat.com/pub/fedora/linux/core/updates/3/

8ffa25a375fde2490f9066094f9b963a SRPMS/ntp-4.2.0.a.20040617-5.FC3.src.rpm
a1df48b304321dcab2d50d1ab7ad490c x86_64/ntp-4.2.0.a.20040617-5.FC3.x86_64.rpm
c90cc76e4a237216e1fa73099a7784f4 x86_64/debug/ntp-debuginfo-4.2.0.a.20040617-5.FC3.x86_64.rpm
19f969758a759187854a4082f939ca09 i386/ntp-4.2.0.a.20040617-5.FC3.i386.rpm
6c0067db4f0f98903d8107dee90f78ce i386/debug/ntp-debuginfo-4.2.0.a.20040617-5.FC3.i386.rpm

This update can also be installed with the Update Agent; you can
launch the Update Agent with the 'up2date' command.