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<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd">
<glsa id="200905-08">
<title>NTP: Remote execution of arbitrary code</title>
<synopsis>
Multiple errors in the NTP client and server programs might allow for the
remote execution of arbitrary code.
</synopsis>
<product type="ebuild">ntp</product>
<announced>May 26, 2009</announced>
<revised>May 26, 2009: 01</revised>
<bug>263033</bug>
<bug>268962</bug>
<access>remote</access>
<affected>
<package name="net-misc/ntp" auto="yes" arch="*">
<unaffected range="ge">4.2.4_p7</unaffected>
<vulnerable range="lt">4.2.4_p7</vulnerable>
</package>
</affected>
<background>
<p>
NTP contains the client and daemon implementations for the Network Time
Protocol.
</p>
</background>
<description>
<p>
Multiple vulnerabilities have been found in the programs included in
the NTP package:
</p>
<ul>
<li>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).</li>
<li>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).</li>
</ul>
</description>
<impact type="high">
<p>
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.
</p>
<p>
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.
</p>
</impact>
<workaround>
<p>
You can protect against CVE-2009-1252 by disabling the 'ssl' USE flag
and recompiling NTP.
</p>
</workaround>
<resolution>
<p>
All NTP users should upgrade to the latest version:
</p>
<code>
# emerge --sync
# emerge --ask --oneshot --verbose &quot;&gt;=net-misc/ntp-4.2.4_p7&quot;</code>
</resolution>
<references>
<uri link="http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-0159">CVE-2009-0159</uri>
<uri link="http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-1252">CVE-2009-1252</uri>
</references>
<metadata tag="submitter" timestamp="Mon, 25 May 2009 17:26:27 +0000">
a3li
</metadata>
<metadata tag="bugReady" timestamp="Mon, 25 May 2009 17:27:05 +0000">
a3li
</metadata>
</glsa>