Issued:

2016-05-31

Updated:

2016-05-31

RHSA-2016:1141 - Moderate: ntp security update

Synopsis

Moderate: ntp security update

Type/Severity

Security Advisory Moderate

Topic

An update for ntp is now available for Red Hat Enterprise Linux 6 and Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Description

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 was configured in broadcast mode, a remote attacker could broadcast packets with bad authentication to all clients. The clients, upon receiving the malformed packets, would break the association with the broadcast server, causing them to become out of sync over a longer period of time. (CVE-2015-7979)

• A denial of service flaw was found in the way NTP handled preemptable client associations. A remote attacker could send several crypto NAK packets to a victim client, each with a spoofed source address of an existing associated peer, preventing that client from synchronizing its time. (CVE-2016-1547)

• It was found that an ntpd client could be forced to change from basic client/server mode to the interleaved symmetric mode. A remote attacker could use a spoofed packet that, when processed by an ntpd client, would cause that client to reject all future legitimate server responses, effectively disabling time synchronization on that client. (CVE-2016-1548)

• A flaw was found in the way NTP's libntp performed message authentication. An attacker able to observe the timing of the comparison function used in packet authentication could potentially use this flaw to recover the message digest. (CVE-2016-1550)

• An out-of-bounds access flaw was found in the way ntpd processed certain packets. An authenticated attacker could use a crafted packet to create a peer association with hmode of 7 and larger, which could potentially (although highly unlikely) cause ntpd to crash. (CVE-2016-2518)

The CVE-2016-1548 issue was discovered by Miroslav Lichvar (Red Hat).

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

Affected Products

Updated Packages

• ntp-debuginfo-4.2.6p5-22.el7_2.2.x86_64.rpm
• ntp-4.2.6p5-10.el6.1.s390x.rpm
• ntp-debuginfo-4.2.6p5-10.el6.1.x86_64.rpm
• ntp-4.2.6p5-10.el6.1.x86_64.rpm
• ntp-debuginfo-4.2.6p5-10.el6.1.ppc64.rpm
• ntp-doc-4.2.6p5-10.el6.1.noarch.rpm
• ntp-4.2.6p5-10.el6.1.src.rpm
• ntp-4.2.6p5-22.el7_2.2.ppc64le.rpm
• ntp-4.2.6p5-22.el7_2.2.ppc64.rpm
• ntp-debuginfo-4.2.6p5-22.el7_2.2.ppc64.rpm
• ntpdate-4.2.6p5-10.el6.1.ppc64.rpm
• ntp-perl-4.2.6p5-10.el6.1.ppc64.rpm
• ntpdate-4.2.6p5-22.el7_2.2.x86_64.rpm
• sntp-4.2.6p5-22.el7_2.2.ppc64.rpm
• sntp-4.2.6p5-22.el7_2.2.s390x.rpm
• ntp-perl-4.2.6p5-10.el6.1.s390x.rpm
• sntp-4.2.6p5-22.el7_2.2.x86_64.rpm
• ntp-perl-4.2.6p5-22.el7_2.2.noarch.rpm
• ntpdate-4.2.6p5-10.el6.1.x86_64.rpm
• ntp-4.2.6p5-22.el7_2.2.x86_64.rpm
• ntp-doc-4.2.6p5-22.el7_2.2.noarch.rpm
• ntpdate-4.2.6p5-10.el6.1.i686.rpm
• ntp-perl-4.2.6p5-10.el6.1.x86_64.rpm
• ntp-debuginfo-4.2.6p5-22.el7_2.2.ppc64le.rpm
• ntp-perl-4.2.6p5-10.el6.1.i686.rpm
• ntp-4.2.6p5-10.el6.1.i686.rpm
• sntp-4.2.6p5-22.el7_2.2.ppc64le.rpm
• ntp-debuginfo-4.2.6p5-10.el6.1.i686.rpm
• ntp-debuginfo-4.2.6p5-10.el6.1.s390x.rpm
• ntpdate-4.2.6p5-22.el7_2.2.ppc64le.rpm
• ntpdate-4.2.6p5-10.el6.1.s390x.rpm
• ntp-debuginfo-4.2.6p5-22.el7_2.2.s390x.rpm
• ntpdate-4.2.6p5-22.el7_2.2.ppc64.rpm
• ntpdate-4.2.6p5-22.el7_2.2.s390x.rpm
• ntp-4.2.6p5-22.el7_2.2.src.rpm
• ntp-4.2.6p5-10.el6.1.ppc64.rpm
• ntp-4.2.6p5-22.el7_2.2.s390x.rpm

Fixes

• This content is not included.BZ - 1300271
• This content is not included.BZ - 1331461
• This content is not included.BZ - 1331462
• This content is not included.BZ - 1331464
• This content is not included.BZ - 1331468

CVEs

• CVE-2015-7979
• CVE-2016-1547
• CVE-2016-1548
• CVE-2016-1550
• CVE-2016-2518

References

• http://www.redhat.com/security/updates/classification/#normal

Additional information

• The Red Hat security contact is This content is not included.secalert@redhat.com. More contact details at https://access.redhat.com/security/team/contact/.
• Offline Security Data data is available for integration with other systems. See Offline Security Data API to get started.