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