Scientific Linux 6/7: SLSA-2014:2024-1 Important: ntp Buffer Overflow

Date: Sat, 20 Dec 2014 19:22:14 +0000
Reply-To: scientific-linux-users@
Sender: Security Errata for Scientific Linux
 
From: Pat Riehecky 
Subject: Security ERRATA Important: ntp on SL6.x, SL7.x i386/x86_64
MIME-Version: 1.0

Synopsis: Important: ntp security update
Advisory ID: SLSA-2014:2024-1
Issue Date: 2014-12-20
CVE Numbers: CVE-2014-9293
 CVE-2014-9294
 CVE-2014-9295
 CVE-2014-9296
--

Multiple buffer overflow flaws were discovered in ntpd's crypto_recv(),
ctl_putdata(), and configure() functions. A remote attacker could use
either of these flaws to send a specially crafted request packet that
could crash ntpd or, potentially, execute arbitrary code with the
privileges of the ntp user. Note: the crypto_recv() flaw requires non-
default configurations to be active, while the ctl_putdata() flaw, by
default, can only be exploited via local attackers, and the configure()
flaw requires additional authentication to exploit. (CVE-2014-9295)

It was found that ntpd automatically generated weak keys for its internal
use if no ntpdc request authentication key was specified in the ntp.conf
configuration file. A remote attacker able to match the configured IP
restrictions could guess the generated key, and possibly use it to send
ntpdc query or configuration requests. (CVE-2014-9293)

It was found that ntp-keygen used a weak method for generating MD5 keys.
This could possibly allow an attacker to guess generated MD5 keys that
could then be used to spoof an NTP client or server. Note: it is
recommended to regenerate any MD5 keys that had explicitly been generated
with ntp-keygen; the default installation does not contain such keys).
(CVE-2014-9294)

A missing return statement in the receive() function could potentially
allow a remote attacker to bypass NTP's authentication mechanism.
(CVE-2014-9296)

After installing the update, the ntpd daemon will restart automatically.
--

SL6
 x86_64
 ntp-4.2.6p5-2.el6_6.x86_64.rpm
 ntp-debuginfo-4.2.6p5-2.el6_6.x86_64.rpm
 ntpdate-4.2.6p5-2.el6_6.x86_64.rpm
 ntp-perl-4.2.6p5-2.el6_6.x86_64.rpm
 i386
 ntp-4.2.6p5-2.el6_6.i686.rpm
 ntp-debuginfo-4.2.6p5-2.el6_6.i686.rpm
 ntpdate-4.2.6p5-2.el6_6.i686.rpm
 ntp-perl-4.2.6p5-2.el6_6.i686.rpm
 noarch
 ntp-doc-4.2.6p5-2.el6_6.noarch.rpm
SL7
 x86_64
 ntp-4.2.6p5-19.el7_0.x86_64.rpm
 ntp-debuginfo-4.2.6p5-19.el7_0.x86_64.rpm
 ntpdate-4.2.6p5-19.el7_0.x86_64.rpm
 sntp-4.2.6p5-19.el7_0.x86_64.rpm
 noarch
 ntp-doc-4.2.6p5-19.el7_0.noarch.rpm
 ntp-perl-4.2.6p5-19.el7_0.noarch.rpm

- Scientific Linux Development Team