blob: 4a68cfcb032f7a286b34e33fdcec8b5716d854c5 [file] [log] [blame]
<?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>May 14, 2004</announced>
<revised>May 14, 2004: 01</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 ">=mail-mta/exim-4.33-r1"
# emerge ">=mail-mta/exim-4.33-r1"</code>
</resolution>
<references>
<uri link="http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0400">CAN-2004-0400</uri>
</references>
<metadata tag="submitter">
koon
</metadata>
</glsa>