[ GLSA 200905-08 ] NTP: Remote execution of arbitrary code

[Alex Legler <a3li () gentoo org>]

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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

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