It was found that the :config command can be used to set the pidfile and driftfile paths without any restrictions. A remote attacker could use this flaw to overwrite a file on the file system with a file containing the pid of the ntpd process (immediately) or the current estimated drift of the system clock (in hourly intervals). For example: ntpq -c ':config pidfile /tmp/ntp.pid' ntpq -c ':config driftfile /tmp/ntp.drift' In RHEL/Fedora ntpd is configured to drop root privileges, which limits the impact of this issue. Additionally, in the default NTP configuration, runtime configuration with ntpq or ntpdc is limited to localhost, further limiting the impact of this issue. Acknowledgements: This issue was discovered by Miroslav Lichvár of Red Hat.
Created ntp tracking bugs for this issue: Affects: fedora-all [bug 1256667]
ntp-4.2.6p5-33.fc21 has been submitted as an update to Fedora 21. https://bodhi.fedoraproject.org/updates/FEDORA-2015-14211
ntp-4.2.6p5-33.fc22 has been submitted as an update to Fedora 22. https://bodhi.fedoraproject.org/updates/FEDORA-2015-14212
ntp-4.2.6p5-33.fc23 has been submitted as an update to Fedora 23. https://bodhi.fedoraproject.org/updates/FEDORA-2015-14213
ntp-4.2.6p5-33.fc23 has been pushed to the Fedora 23 testing repository. If problems still persist, please make note of it in this bug report.\nIf you want to test the update, you can install it with \n su -c 'yum --enablerepo=updates-testing update ntp'. You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2015-14213
ntp-4.2.6p5-33.fc21 has been pushed to the Fedora 21 testing repository. If problems still persist, please make note of it in this bug report.\nIf you want to test the update, you can install it with \n su -c 'yum --enablerepo=updates-testing update ntp'. You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2015-14211
ntp-4.2.6p5-33.fc22 has been pushed to the Fedora 22 testing repository. If problems still persist, please make note of it in this bug report.\nIf you want to test the update, you can install it with \n su -c 'yum --enablerepo=updates-testing update ntp'. You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2015-14212
ntp-4.2.6p5-33.fc23 has been pushed to the Fedora 23 stable repository. If problems still persist, please make note of it in this bug report.
ntp-4.2.6p5-33.fc22 has been pushed to the Fedora 22 stable repository. If problems still persist, please make note of it in this bug report.
Note that this is the same issue as: Bug 2902 : CVE-2015-7703 configuration directives "pidfile" and "driftfile" should only be allowed locally. (RedHat) in http://support.ntp.org/bin/view/Main/SecurityNotice#October_2015_NTP_Security_Vulner CVE reject request has been sent: http://seclists.org/oss-sec/2015/q4/137
(In reply to Martin Prpic from comment #13) > Note that this is the same issue as: > > Bug 2902 : CVE-2015-7703 configuration directives "pidfile" and "driftfile" > should only be allowed locally. (RedHat) > > in > http://support.ntp.org/bin/view/Main/ > SecurityNotice#October_2015_NTP_Security_Vulner > > CVE reject request has been sent: > > http://seclists.org/oss-sec/2015/q4/137 MITRE decided to reject CVE-2015-5196; changing this bug to reference CVE-2015-7703 instead: http://seclists.org/oss-sec/2015/q4/146
We should keep the rejected CVE here as alias.
ntp-4.2.6p5-34.fc21 has been pushed to the Fedora 21 stable repository. If problems still persist, please make note of it in this bug report.
Mitigation: Disable remote runtime configuration with ntpq or ntpdc. In the default NTP configuration on Red Hat Enterprise Linux, runtime configuration with ntpq or ntpdc is limited to localhost.
This issue has been addressed in the following products: Red Hat Enterprise Linux 6 Via RHSA-2016:0780 https://rhn.redhat.com/errata/RHSA-2016-0780.html
This issue has been addressed in the following products: Red Hat Enterprise Linux 7 Via RHSA-2016:2583 https://rhn.redhat.com/errata/RHSA-2016-2583.html