RHEL 4 / 5 : ntp (RHSA-2009:0046)

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


Synopsis :

The remote Red Hat host is missing a security update.

Description :

Updated ntp packages to correct a security issue are 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.

A flaw was discovered in the way the ntpd daemon checked the return
value of the OpenSSL EVP_VerifyFinal function. On systems using NTPv4
authentication, this could lead to an incorrect verification of
cryptographic signatures, allowing time-spoofing attacks.
(CVE-2009-0021)

Note: This issue only affects systems that have enabled NTP
authentication. By default, NTP authentication is not enabled.

All ntp users are advised to upgrade to the updated packages, which
contain 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-2009-0021.html
http://rhn.redhat.com/errata/RHSA-2009-0046.html

Solution :

Update the affected ntp package.

Risk factor :

Medium / CVSS Base Score : 5.8
(CVSS2#AV:N/AC:M/Au:N/C:N/I:P/A:P)
CVSS Temporal Score : 4.8
(CVSS2#E:F/RL:OF/RC:C)
Public Exploit Available : true