1. Ubuntu Security Notices
  2. USN-3349-1

USN-3349-1: NTP vulnerabilities

Publication date

5 July 2017

Overview

Several security issues were fixed in NTP.

Releases

Packages

  • ntp - Network Time Protocol daemon and utility programs

Details

Yihan Lian discovered that NTP incorrectly handled certain large request
data values. A remote attacker could possibly use this issue to cause NTP
to crash, resulting in a denial of service. This issue only affected
Ubuntu 16.04 LTS. (CVE-2016-2519)

Miroslav Lichvar discovered that NTP incorrectly handled certain spoofed
addresses when performing rate limiting. A remote attacker could possibly
use this issue to perform a denial of service. This issue only affected
Ubuntu 14.04 LTS, Ubuntu 16.04 LTS, and Ubuntu 16.10. (CVE-2016-7426)

Matthew Van Gundy discovered that NTP incorrectly handled certain crafted
broadcast mode packets. A remote attacker could possibly use this issue to
perform a denial of service. This issue only affected Ubuntu 14.04 LTS,
Ubuntu 16.04 LTS, and Ubuntu 16.10. (CVE-2016-7427,

Yihan Lian discovered that NTP incorrectly handled certain large request
data values. A remote attacker could possibly use this issue to cause NTP
to crash, resulting in a denial of service. This issue only affected
Ubuntu 16.04 LTS. (CVE-2016-2519)

Miroslav Lichvar discovered that NTP incorrectly handled certain spoofed
addresses when performing rate limiting. A remote attacker could possibly
use this issue to perform a denial of service. This issue only affected
Ubuntu 14.04 LTS, Ubuntu 16.04 LTS, and Ubuntu 16.10. (CVE-2016-7426)

Matthew Van Gundy discovered that NTP incorrectly handled certain crafted
broadcast mode packets. A remote attacker could possibly use this issue to
perform a denial of service. This issue only affected Ubuntu 14.04 LTS,
Ubuntu 16.04 LTS, and Ubuntu 16.10. (CVE-2016-7427, CVE-2016-7428)

Miroslav Lichvar discovered that NTP incorrectly handled certain responses.
A remote attacker could possibly use this issue to perform a denial of
service. This issue only affected Ubuntu 14.04 LTS, Ubuntu 16.04 LTS, and
Ubuntu 16.10. (CVE-2016-7429)

Sharon Goldberg and Aanchal Malhotra discovered that NTP incorrectly
handled origin timestamps of zero. A remote attacker could possibly use
this issue to bypass the origin timestamp protection mechanism. This issue
only affected Ubuntu 16.10. (CVE-2016-7431)

Brian Utterback, Sharon Goldberg and Aanchal Malhotra discovered that NTP
incorrectly performed initial sync calculations. This issue only applied
to Ubuntu 16.04 LTS and Ubuntu 16.10. (CVE-2016-7433)

Magnus Stubman discovered that NTP incorrectly handled certain mrulist
queries. A remote attacker could possibly use this issue to cause NTP to
crash, resulting in a denial of service. This issue only affected Ubuntu
16.04 LTS and Ubuntu 16.10. (CVE-2016-7434)

Matthew Van Gund discovered that NTP incorrectly handled origin timestamp
checks. A remote attacker could possibly use this issue to perform a denial
of service. This issue only affected Ubuntu Ubuntu 16.10, and Ubuntu 17.04.
(CVE-2016-9042)

Matthew Van Gundy discovered that NTP incorrectly handled certain control
mode packets. A remote attacker could use this issue to set or unset traps.
This issue only applied to Ubuntu 14.04 LTS, Ubuntu 16.04 LTS and Ubuntu
16.10. (CVE-2016-9310)

Matthew Van Gundy discovered that NTP incorrectly handled the trap service.
A remote attacker could possibly use this issue to cause NTP to crash,
resulting in a denial of service. This issue only applied to Ubuntu 14.04
LTS, Ubuntu 16.04 LTS and Ubuntu 16.10. (CVE-2016-9311)

It was discovered that NTP incorrectly handled memory when processing long
variables. A remote authenticated user could possibly use this issue to
cause NTP to crash, resulting in a denial of service. (CVE-2017-6458)

It was discovered that NTP incorrectly handled memory when processing long
variables. A remote authenticated user could possibly use this issue to
cause NTP to crash, resulting in a denial of service. This issue only
applied to Ubuntu 16.04 LTS, Ubuntu 16.10 and Ubuntu 17.04. (CVE-2017-6460)

It was discovered that the NTP legacy DPTS refclock driver incorrectly
handled the /dev/datum device. A local attacker could possibly use this
issue to cause a denial of service. (CVE-2017-6462)

It was discovered that NTP incorrectly handled certain invalid settings
in a :config directive. A remote authenticated user could possibly use
this issue to cause NTP to crash, resulting in a denial of service.
(CVE-2017-6463)

It was discovered that NTP incorrectly handled certain invalid mode
configuration directives. A remote authenticated user could possibly use
this issue to cause NTP to crash, resulting in a denial of service.
(CVE-2017-6464)

Update instructions

In general, a standard system update will make all the necessary changes.

Learn more about how to get the fixes.

The problem can be corrected by updating your system to the following package versions:

Ubuntu Release Package Version
17.04 zesty ntp –  1:4.2.8p9+dfsg-2ubuntu1.1
16.10 yakkety ntp –  1:4.2.8p8+dfsg-1ubuntu2.1
16.04 xenial ntp –  1:4.2.8p4+dfsg-3ubuntu5.5
14.04 trusty ntp –  1:4.2.6.p5+dfsg-3ubuntu2.14.04.11

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References

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