RHEL 4 / 5 : ntp (RHSA-2009:0046)
Medium Nessus Plugin ID 35551
SynopsisThe remote Red Hat host is missing a security update.
DescriptionUpdated 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.
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.
SolutionUpdate the affected ntp package.