==========================================================================
Ubuntu Security Notice USN-2449-1
December 22, 2014

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

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

– Ubuntu 14.10
– Ubuntu 14.04 LTS
– Ubuntu 12.04 LTS
– Ubuntu 10.04 LTS

Summary:

Several security issues were fixed in NTP.

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

Details:

Neel Mehta discovered that NTP generated weak authentication keys. A remote
attacker could possibly use this issue to brute force the authentication
key and send requests if permitted by IP restrictions. (CVE-2014-9293)

Stephen Roettger discovered that NTP generated weak MD5 keys. A remote
attacker could possibly use this issue to brute force the MD5 key and spoof
a client or server. (CVE-2014-9294)

Stephen Roettger discovered that NTP contained buffer overflows in the
crypto_recv(), ctl_putdata() and configure() functions. In non-default
configurations, a remote attacker could use these issues to cause NTP to
crash, resulting in a denial of service, or possibly execute arbitrary
code. The default compiler options for affected releases should reduce the
vulnerability to a denial of service. In addition, attackers would be
isolated by the NTP AppArmor profile. (CVE-2014-9295)

Stephen Roettger discovered that NTP incorrectly continued processing when
handling certain errors. (CVE-2014-9296)

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-3ubuntu2.14.10.1

Ubuntu 14.04 LTS:
ntp 1:4.2.6.p5+dfsg-3ubuntu2.14.04.1

Ubuntu 12.04 LTS:
ntp 1:4.2.6.p3+dfsg-1ubuntu3.2

Ubuntu 10.04 LTS:
ntp 1:4.2.4p8+dfsg-1ubuntu2.2

After a standard system update you need to regenerate any MD5 keys that
were manually created with ntp-keygen.

References:
http://www.ubuntu.com/usn/usn-2449-1
CVE-2014-9293, CVE-2014-9294, CVE-2014-9295, CVE-2014-9296

Package Information:
https://launchpad.net/ubuntu/+source/ntp/1:4.2.6.p5+dfsg-3ubuntu2.14.10.1
https://launchpad.net/ubuntu/+source/ntp/1:4.2.6.p5+dfsg-3ubuntu2.14.04.1
https://launchpad.net/ubuntu/+source/ntp/1:4.2.6.p3+dfsg-1ubuntu3.2
https://launchpad.net/ubuntu/+source/ntp/1:4.2.4p8+dfsg-1ubuntu2.2

—–BEGIN PGP SIGNATURE—–
Version: GnuPG v1
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=VKAa
—–END PGP SIGNATURE—–
—