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