Synopsis: Important: ntp security update
Advisory ID: SLSA-2014:2024-1
Issue Date: 2014-12-20
CVE Numbers: CVE-2014-9293
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).
A missing return statement in the receive() function could potentially
allow a remote attacker to bypass NTP’s authentication mechanism.
After installing the update, the ntpd daemon will restart automatically.
– Scientific Linux Development Team