7.5 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.1 High
CVSS2
Access Vector
NETWORK
Access Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
AV:N/AC:M/Au:N/C:N/I:N/A:C
0.058 Low
EPSS
Percentile
93.3%
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:
https://lists.centos.org/pipermail/centos-announce/2017-February/084428.html
https://lists.centos.org/pipermail/centos-announce/2017-February/084429.html
Affected packages:
ntp
ntp-doc
ntp-perl
ntpdate
sntp
Upstream details at:
https://access.redhat.com/errata/RHSA-2017:0252
OS | Version | Architecture | Package | Version | Filename |
---|---|---|---|---|---|
CentOS | 6 | i686 | ntp | < 4.2.6p5-10.el6.centos.2 | ntp-4.2.6p5-10.el6.centos.2.i686.rpm |
CentOS | 6 | i686 | ntpdate | < 4.2.6p5-10.el6.centos.2 | ntpdate-4.2.6p5-10.el6.centos.2.i686.rpm |
CentOS | 6 | noarch | ntp-doc | < 4.2.6p5-10.el6.centos.2 | ntp-doc-4.2.6p5-10.el6.centos.2.noarch.rpm |
CentOS | 6 | i686 | ntp-perl | < 4.2.6p5-10.el6.centos.2 | ntp-perl-4.2.6p5-10.el6.centos.2.i686.rpm |
CentOS | 6 | x86_64 | ntp | < 4.2.6p5-10.el6.centos.2 | ntp-4.2.6p5-10.el6.centos.2.x86_64.rpm |
CentOS | 6 | x86_64 | ntpdate | < 4.2.6p5-10.el6.centos.2 | ntpdate-4.2.6p5-10.el6.centos.2.x86_64.rpm |
CentOS | 6 | noarch | ntp-doc | < 4.2.6p5-10.el6.centos.2 | ntp-doc-4.2.6p5-10.el6.centos.2.noarch.rpm |
CentOS | 6 | x86_64 | ntp-perl | < 4.2.6p5-10.el6.centos.2 | ntp-perl-4.2.6p5-10.el6.centos.2.x86_64.rpm |
CentOS | 7 | x86_64 | ntp | < 4.2.6p5-25.el7.centos.1 | ntp-4.2.6p5-25.el7.centos.1.x86_64.rpm |
CentOS | 7 | x86_64 | ntpdate | < 4.2.6p5-25.el7.centos.1 | ntpdate-4.2.6p5-25.el7.centos.1.x86_64.rpm |
7.5 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.1 High
CVSS2
Access Vector
NETWORK
Access Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
AV:N/AC:M/Au:N/C:N/I:N/A:C
0.058 Low
EPSS
Percentile
93.3%