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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

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 Package       /  Vulnerable  /                         Unaffected
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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
[email protected] 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