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Ubuntu Security Notice USN-2567-1
April 13, 2015
ntp vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
– Ubuntu 14.10
– Ubuntu 14.04 LTS
– Ubuntu 12.04 LTS
Summary:
Several security issues were fixed in NTP.
Software Description:
– ntp: Network Time Protocol daemon and utility programs
Details:
Miroslav Lichvar discovered that NTP incorrectly validated MAC fields. A
remote attacker could possibly use this issue to bypass authentication and
spoof packets. (CVE-2015-1798)
Miroslav Lichvar discovered that NTP incorrectly handled certain invalid
packets. A remote attacker could possibly use this issue to cause a denial
of service. (CVE-2015-1799)
Juergen Perlinger discovered that NTP incorrectly generated MD5 keys on
big-endian platforms. This issue could either cause ntp-keygen to hang, or
could result in non-random keys. (CVE number pending)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 14.10:
ntp 1:4.2.6.p5+dfsg-3ubuntu2.14.10.3
Ubuntu 14.04 LTS:
ntp 1:4.2.6.p5+dfsg-3ubuntu2.14.04.3
Ubuntu 12.04 LTS:
ntp 1:4.2.6.p3+dfsg-1ubuntu3.4
In general, a standard system update will make all the necessary changes.
References:
http://www.ubuntu.com/usn/usn-2567-1
CVE-2015-1798, CVE-2015-1799
Package Information:
https://launchpad.net/ubuntu/+source/ntp/1:4.2.6.p5+dfsg-3ubuntu2.14.10.3
https://launchpad.net/ubuntu/+source/ntp/1:4.2.6.p5+dfsg-3ubuntu2.14.04.3
https://launchpad.net/ubuntu/+source/ntp/1:4.2.6.p3+dfsg-1ubuntu3.4
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