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+<?xml version="1.0" encoding="utf-8"?>
+<!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd">
+<glsa id="200405-07">
+ <title>Exim verify=header_syntax buffer overflow</title>
+ <synopsis>
+ When the verify=header_syntax option is set, there is a buffer overflow in
+ Exim that allows remote execution of arbitrary code.
+ </synopsis>
+ <product type="ebuild">Exim</product>
+ <announced>2004-05-14</announced>
+ <revised count="01">2004-05-14</revised>
+ <bug>50217</bug>
+ <access>remote </access>
+ <affected>
+ <package name="mail-mta/exim" auto="yes" arch="*">
+ <unaffected range="ge">4.33-r1</unaffected>
+ <vulnerable range="le">4.33</vulnerable>
+ </package>
+ </affected>
+ <background>
+ <p>
+ Exim is an highly configurable message transfer agent (MTA) developed at
+ the University of Cambridge.
+ </p>
+ </background>
+ <description>
+ <p>
+ When the option "verify = header_syntax" is used in an ACL in the
+ configuration file, Exim is vulnerable to a buffer overflow attack that can
+ be triggered remotely by sending malicious headers in an email message.
+ Note that this option is not enabled in Exim's default configuration file.
+ </p>
+ </description>
+ <impact type="high">
+ <p>
+ This vulnerability can be exploited to trigger a denial of service attack
+ and potentially execute arbitrary code with the rights of the user used by
+ the Exim daemon (by default this is the "mail" user in Gentoo Linux).
+ </p>
+ </impact>
+ <workaround>
+ <p>
+ Make sure the verify=header_syntax option is not used in your exim.conf
+ file.
+ </p>
+ </workaround>
+ <resolution>
+ <p>
+ All users of Exim should upgrade to the latest stable version:
+ </p>
+ <code>
+ # emerge sync
+
+ # emerge -pv "&gt;=mail-mta/exim-4.33-r1"
+ # emerge "&gt;=mail-mta/exim-4.33-r1"</code>
+ </resolution>
+ <references>
+ <uri link="https://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0400">CAN-2004-0400</uri>
+ </references>
+ <metadata tag="submitter">
+ koon
+ </metadata>
+</glsa>