Subject: [ GLSA 200905-08 ] NTP: Remote execution of arbitrary code
From: Alex Legler <a3li@gentoo.org.>
To: [email protected]
Cc: [email protected], [email protected],
[email protected]
Content-Type: multipart/signed; micalg="pgp-sha1"; protocol="application/pgp-signature"; boundary="=-3xMTnFch7mf78xePpfOC"
Date: Tue, 26 May 2009 18:06:20 +0200
Message-Id: <1243353980.4227.48.camel@localhost.>
Mime-Version: 1.0
X-Mailer: Evolution 2.26.2
X-Virus-Scanned: antivirus-gw at tyumen.ru
--=-3xMTnFch7mf78xePpfOC
Content-Type: text/plain
Content-Transfer-Encoding: quoted-printable
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Gentoo Linux Security Advisory GLSA 200905-08
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
http://security.gentoo.org/
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Severity: High
Title: NTP: Remote execution of arbitrary code
Date: May 26, 2009
Bugs: #263033, #268962
ID: 200905-08
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Synopsis
=3D=3D=3D=3D=3D=3D=3D=3D
Multiple errors in the NTP client and server programs might allow for
the remote execution of arbitrary code.
Background
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
NTP contains the client and daemon implementations for the Network Time
Protocol.
Affected packages
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 net-misc/ntp < 4.2.4_p7 >=3D 4.2.4_p7
Description
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
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
=3D=3D=3D=3D=3D=3D
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
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
You can protect against CVE-2009-1252 by disabling the 'ssl' USE flag
and recompiling NTP.
Resolution
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
All NTP users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=3Dnet-misc/ntp-4.2.4_p7"
References
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
[ 1 ] CVE-2009-0159
http://cve.mitre.org/cgi-bin/cvename.cgi?name=3DCVE-2009-0159
[ 2 ] CVE-2009-1252
http://cve.mitre.org/cgi-bin/cvename.cgi?name=3DCVE-2009-1252
Availability
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
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?
=3D=3D=3D=3D=3D=3D=3D=3D=3D
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
[email protected] or alternatively, you may file a bug at
http://bugs.gentoo.org.
License
=3D=3D=3D=3D=3D=3D=3D
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
--=-3xMTnFch7mf78xePpfOC
Content-Type: application/pgp-signature; name="signature.asc"
Content-Description: This is a digitally signed message part
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v2.0.11 (GNU/Linux)
iEYEABECAAYFAkocE3wACgkQk+oqhfPAZGnpKgCghkgvDalcELhcFEV69MHPRZa0
Q10An0QC+ug2QYnZGeVCOc7CepY4MqJf
=u+2r
-----END PGP SIGNATURE-----
--=-3xMTnFch7mf78xePpfOC--
