1. Ubuntu Security Notices
  2. USN-2783-1

USN-2783-1: NTP vulnerabilities

Publication date

27 October 2015

Overview

Several security issues were fixed in NTP.

Releases

Packages

  • ntp - Network Time Protocol daemon and utility programs

Details

Aleksis Kauppinen discovered that NTP incorrectly handled certain remote
config packets. In a non-default configuration, a remote authenticated
attacker could possibly use this issue to cause NTP to crash, resulting in
a denial of service. (CVE-2015-5146)

Miroslav Lichvar discovered that NTP incorrectly handled logconfig
directives. In a non-default configuration, a remote authenticated attacker
could possibly use this issue to cause NTP to crash, resulting in a denial
of service. (CVE-2015-5194)

Miroslav Lichvar discovered that NTP incorrectly handled certain statistics
types. In a non-default configuration, a remote authenticated attacker
could possibly use this issue to cause NTP to crash, resulting in a denial
of service. (CVE-2015-5195)

Miroslav Lichvar discovered that NTP incorrectly handled certain...

Aleksis Kauppinen discovered that NTP incorrectly handled certain remote
config packets. In a non-default configuration, a remote authenticated
attacker could possibly use this issue to cause NTP to crash, resulting in
a denial of service. (CVE-2015-5146)

Miroslav Lichvar discovered that NTP incorrectly handled logconfig
directives. In a non-default configuration, a remote authenticated attacker
could possibly use this issue to cause NTP to crash, resulting in a denial
of service. (CVE-2015-5194)

Miroslav Lichvar discovered that NTP incorrectly handled certain statistics
types. In a non-default configuration, a remote authenticated attacker
could possibly use this issue to cause NTP to crash, resulting in a denial
of service. (CVE-2015-5195)

Miroslav Lichvar discovered that NTP incorrectly handled certain file
paths. In a non-default configuration, a remote authenticated attacker
could possibly use this issue to cause NTP to crash, resulting in a denial
of service, or overwrite certain files. (CVE-2015-5196, CVE-2015-7703)

Miroslav Lichvar discovered that NTP incorrectly handled certain packets.
A remote attacker could possibly use this issue to cause NTP to hang,
resulting in a denial of service. (CVE-2015-5219)

Aanchal Malhotra, Isaac E. Cohen, and Sharon Goldberg discovered that NTP
incorrectly handled restarting after hitting a panic threshold. A remote
attacker could possibly use this issue to alter the system time on clients.
(CVE-2015-5300)

It was discovered that NTP incorrectly handled autokey data packets. A
remote attacker could possibly use this issue to cause NTP to crash,
resulting in a denial of service, or possibly execute arbitrary code.
(CVE-2015-7691, CVE-2015-7692, CVE-2015-7702)

It was discovered that NTP incorrectly handled memory when processing
certain autokey messages. A remote attacker could possibly use this issue
to cause NTP to consume memory, resulting in a denial of service.
(CVE-2015-7701)

Aanchal Malhotra, Isaac E. Cohen, and Sharon Goldberg discovered that NTP
incorrectly handled rate limiting. A remote attacker could possibly use
this issue to cause clients to stop updating their clock. (CVE-2015-7704,
CVE-2015-7705)

Yves Younan discovered that NTP incorrectly handled logfile and keyfile
directives. In a non-default configuration, a remote authenticated attacker
could possibly use this issue to cause NTP to enter a loop, resulting in a
denial of service. (CVE-2015-7850)

Yves Younan and Aleksander Nikolich discovered that NTP incorrectly handled
ascii conversion. A remote attacker could possibly use this issue to cause
NTP to crash, resulting in a denial of service, or possibly execute
arbitrary code. (CVE-2015-7852)

Yves Younan discovered that NTP incorrectly handled reference clock memory.
A malicious refclock could possibly use this issue to cause NTP to crash,
resulting in a denial of service, or possibly execute arbitrary code.
(CVE-2015-7853)

John D “Doug” Birdwell discovered that NTP incorrectly handled decoding
certain bogus values. An attacker could possibly use this issue to cause
NTP to crash, resulting in a denial of service. (CVE-2015-7855)

Stephen Gray discovered that NTP incorrectly handled symmetric association
authentication. A remote attacker could use this issue to possibly bypass
authentication and alter the system clock. (CVE-2015-7871)

In the default installation, attackers would be isolated by the NTP
AppArmor profile.

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
15.10 wily ntp –  1:4.2.6.p5+dfsg-3ubuntu8.1
15.04 vivid ntp –  1:4.2.6.p5+dfsg-3ubuntu6.2
14.04 trusty ntp –  1:4.2.6.p5+dfsg-3ubuntu2.14.04.5
12.04 precise ntp –  1:4.2.6.p3+dfsg-1ubuntu3.6

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References

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