[SECURITY] [DLA 116-1] ntp security update

Package : ntp
Version : 4.2.6.p2+dfsg-1+deb6u1
CVE ID : CVE-2014-9293 CVE-2014-9294 CVE-2014-9295 CVE-2014-9296
Debian Bug : 773576

Several vulnerabilities were discovered in the ntp package, an
implementation of the Network Time Protocol.

CVE-2014-9293

ntpd generated a weak key for its internal use, with full
administrative privileges.  Attackers could use this key to
reconfigure ntpd (or to exploit other vulnerabilities).

CVE-2014-9294

The ntp-keygen utility generated weak MD5 keys with insufficient
entropy.

CVE-2014-9295

ntpd had several buffer overflows (both on the stack and in the
data section), allowing remote authenticated attackers to crash
ntpd or potentially execute arbitrary code.

CVE-2014-9296

The general packet processing function in ntpd did not handle an
error case correctly.

The default ntpd configuration in Debian restricts access to localhost
(and possible the adjacent network in case of IPv6).

Keys explicitly generated by "ntp-keygen -M" should be regenerated.

For the oldstable distribution (squeeze), these problems have been fixed in
version 4.2.6.p2+dfsg-1+deb6u1.

We recommend that you upgrade your heirloom-mailx packages.

Thanks to the Florian Weimer for the Red Hat security update.
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