ntp, ntpdate, sntp security update

ID CESA-2017:0252
Type centos
Reporter CentOS Project
Modified 2017-02-06T12:22:53


CentOS Errata and Security Advisory CESA-2017:0252

The Network Time Protocol (NTP) is used to synchronize a computer's time with another referenced time source. These packages include the ntpd service which continuously adjusts system time and utilities used to query and configure the ntpd service.

Security Fix(es):

  • It was found that when ntp is configured with rate limiting for all associations the limits are also applied to responses received from its configured sources. A remote attacker who knows the sources can cause a denial of service by preventing ntpd from accepting valid responses from its sources. (CVE-2016-7426)

  • A flaw was found in the control mode functionality of ntpd. A remote attacker could send a crafted control mode packet which could lead to information disclosure or result in DDoS amplification attacks. (CVE-2016-9310)

  • A flaw was found in the way ntpd implemented the trap service. A remote attacker could send a specially crafted packet to cause a null pointer dereference that will crash ntpd, resulting in a denial of service. (CVE-2016-9311)

  • A flaw was found in the way ntpd running on a host with multiple network interfaces handled certain server responses. A remote attacker could use this flaw which would cause ntpd to not synchronize with the source. (CVE-2016-7429)

  • A flaw was found in the way ntpd calculated the root delay. A remote attacker could send a specially-crafted spoofed packet to cause denial of service or in some special cases even crash. (CVE-2016-7433)

Merged security bulletin from advisories: http://lists.centos.org/pipermail/centos-announce/2017-February/034304.html http://lists.centos.org/pipermail/centos-announce/2017-February/034305.html

Affected packages: ntp ntp-doc ntp-perl ntpdate sntp

Upstream details at: https://rhn.redhat.com/errata/RHSA-2017-0252.html