NTP: Remote execution of arbitrary code
Gentoo Linux Security Advisory
||GLSA 200905-08 / ntp
||May 26, 2009
||May 26, 2009: 01
All supported architectures
Multiple errors in the NTP client and server programs might allow for the
remote execution of arbitrary code.
NTP contains the client and daemon implementations for the Network Time
Multiple vulnerabilities have been found in the programs included in
the NTP package:
- Apple Product Security reported a
boundary error in the cookedprint() function in ntpq/ntpq.c, possibly
leading to a stack-based buffer overflow (CVE-2009-0159).
- Chris Ries of CMU reported a boundary error within the
crypto_recv() function in ntpd/ntp_crypto.c, possibly leading to a
stack-based buffer overflow (CVE-2009-1252).
A remote attacker might send a specially crafted package to a machine
running ntpd, possibly resulting in the remote execution of arbitrary
code with the privileges of the user running the daemon, or a Denial of
Service. NOTE: Successful exploitation requires the "autokey" feature
to be enabled. This feature is only available if NTP was built with the
'ssl' USE flag.
Furthermore, a remote attacker could entice a user into connecting to a
malicious server using ntpq, possibly resulting in the remote execution
of arbitrary code with the privileges of the user running the
application, or a Denial of Service.
You can protect against CVE-2009-1252 by disabling the 'ssl' USE flag
and recompiling NTP.
All NTP users should upgrade to the latest version:
Code Listing 3.1: Resolution
# emerge --sync
# emerge --ask --oneshot --verbose ">=net-misc/ntp-4.2.4_p7"