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Gentoo Linux Security Advisory                           GLSA 200905-08
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                                            http://security.gentoo.org/
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  Severity: High
     Title: NTP: Remote execution of arbitrary code
      Date: May 26, 2009
      Bugs: #263033, #268962
        ID: 200905-08

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Synopsis
========

Multiple errors in the NTP client and server programs might allow for
the remote execution of arbitrary code.

Background
==========

NTP contains the client and daemon implementations for the Network Time
Protocol.

Affected packages
=================

    -------------------------------------------------------------------
     Package       /  Vulnerable  /                         Unaffected
    -------------------------------------------------------------------
  1  net-misc/ntp     < 4.2.4_p7                           >= 4.2.4_p7

Description
===========

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).

Impact
======

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.

Workaround
==========

You can protect against CVE-2009-1252 by disabling the 'ssl' USE flag
and recompiling NTP.

Resolution
==========

All NTP users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=net-misc/ntp-4.2.4_p7"

References
==========

  [ 1 ] CVE-2009-0159
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-0159
  [ 2 ] CVE-2009-1252
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-1252

Availability
============

This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

  http://security.gentoo.org/glsa/glsa-200905-08.xml

Concerns?
=========

Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users machines is of utmost
importance to us. Any security concerns should be addressed to
security@gentoo.org or alternatively, you may file a bug at
http://bugs.gentoo.org.

License
=======

Copyright 2009 Gentoo Foundation, Inc; referenced text
belongs to its owner(s).

The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.

http://creativecommons.org/licenses/by-sa/2.5