[USN-3707-2] NTP vulnerabilities

[Leonidas S. Barbosa]

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Ubuntu Security Notice USN-3707-2
January 23, 2019

ntp vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 12.04 ESM

Summary:

Several security issues were fixed in NTP.

Software Description:
- ntp: Network Time Protocol daemon and utility programs

Details:

USN-3707-1 and USN-3349-1 fixed several vulnerabilities in NTP. This
update provides the corresponding update for Ubuntu 12.04 ESM.

Original advisory details:

 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.
 (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. 
 (CVE-2016-7427, CVE-2016-7428)

 Matthew Van Gundy discovered that NTP incorrectly handled certain
 control mode packets. A remote attacker could use this issue to set or
 unset traps. (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. (CVE-2016-9311)

 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)

 Michael Macnair discovered that NTP incorrectly handled certain
 responses. A remote attacker could possibly use this issue to execute
 arbitrary code. (CVE-2018-7183)

 Miroslav Lichvar discovered that NTP incorrectly handled certain
 zero-origin timestamps. A remote attacker could possibly use this
 issue to cause a denial of service. (CVE-2018-7185)

Update instructions:

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

Ubuntu 12.04 ESM:
  ntp                             1:4.2.6.p3+dfsg-1ubuntu3.12

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

References:
  https://usn.ubuntu.com/usn/usn-3707-2
  https://usn.ubuntu.com/usn/usn-3707-1
  CVE-2016-7426, CVE-2016-7427, CVE-2016-7428, CVE-2016-9310,
  CVE-2016-9311, CVE-2017-6462, CVE-2017-6463, CVE-2018-7183,
  CVE-2018-7185
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