Scientific Linux Security Update : ntp on SL6.x, SL7.x i386/x86_64

Medium Nessus Plugin ID 86615


The remote Scientific Linux host is missing one or more security updates.


It was discovered that ntpd as a client did not correctly check timestamps in Kiss-of-Death packets. A remote attacker could use this flaw to send a crafted Kiss-of-Death packet to an ntpd client that would increase the client's polling interval value, and effectively disable synchronization with the server. (CVE-2015-7704)

It was found that ntpd did not correctly implement the threshold limitation for the '-g' option, which is used to set the time without any restrictions. A man-in-the-middle attacker able to intercept NTP traffic between a connecting client and an NTP server could use this flaw to force that client to make multiple steps larger than the panic threshold, effectively changing the time to an arbitrary value.

After installing the update, the ntpd daemon will restart automatically.


Update the affected packages.

See Also

Plugin Details

Severity: Medium

ID: 86615

File Name: sl_20151026_ntp_on_SL6_x.nasl

Version: $Revision: 2.8 $

Type: local

Agent: unix

Published: 2015/10/27

Modified: 2018/01/26

Dependencies: 12634

Risk Information

Risk Factor: Medium


Base Score: 5

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P


Base Score: 7.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Vulnerability Information

CPE: x-cpe:/o:fermilab:scientific_linux

Required KB Items: Host/local_checks_enabled, Host/cpu, Host/RedHat/release, Host/RedHat/rpm-list

Patch Publication Date: 2015/10/26

Reference Information

CVE: CVE-2015-5300, CVE-2015-7704