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<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd">
<glsa id="200408-19">
<title>courier-imap: Remote Format String Vulnerability</title>
<synopsis>
There is a format string vulnerability in non-standard configurations of
courier-imapd which may be exploited remotely. An attacker may be able to
execute arbitrary code as the user running courier-imapd (oftentimes root).
</synopsis>
<product type="ebuild">courier-imap</product>
<announced>August 19, 2004</announced>
<revised>May 22, 2006: 02</revised>
<bug>60865</bug>
<access>remote</access>
<affected>
<package name="net-mail/courier-imap" auto="yes" arch="*">
<unaffected range="ge">3.0.5</unaffected>
<vulnerable range="le">3.0.2-r1</vulnerable>
</package>
</affected>
<background>
<p>
Courier-IMAP is an IMAP server which is part of the Courier mail
system. It provides access only to maildirs.
</p>
</background>
<description>
<p>
There is a format string vulnerability in the auth_debug() function
which can be exploited remotely, potentially leading to arbitrary code
execution as the user running the IMAP daemon (oftentimes root). A
remote attacker may send username or password information containing
printf() format tokens (such as "%s"), which will crash the server or
cause it to execute arbitrary code.
</p>
<p>
This vulnerability can only be exploited if DEBUG_LOGIN is set to
something other than 0 in the imapd config file.
</p>
</description>
<impact type="high">
<p>
If DEBUG_LOGIN is enabled in the imapd configuration, a remote attacker
may execute arbitrary code as the root user.
</p>
</impact>
<workaround>
<p>
Set the DEBUG_LOGIN option in /etc/courier-imap/imapd to 0. (This is
the default value.)
</p>
</workaround>
<resolution>
<p>
All courier-imap users should upgrade to the latest version:
</p>
<code>
# emerge sync
# emerge -pv &quot;&gt;=net-mail/courier-imap-3.0.5&quot;
# emerge &quot;&gt;=net-mail/courier-imap-3.0.5&quot;</code>
</resolution>
<references>
<uri link="http://www.idefense.com/application/poi/display?id=131&amp;type=vulnerabilities&amp;flashstatus=true">iDEFENSE Advisory</uri>
<uri link="http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2004-0777">CVE-2004-0777</uri>
</references>
<metadata tag="submitter" timestamp="Thu, 19 Aug 2004 18:47:27 +0000">
condordes
</metadata>
</glsa>