[UNIX] Security Bug Found in W3Mail Webmail

From: support@securiteam.com
Date: 10/10/01 

From: support@securiteam.com
To: list@securiteam.com
Subject: [UNIX] Security Bug Found in W3Mail Webmail
Message-Id: <20011010063513.DE96F138C4@mail.der-keiler.de>
Date: Wed, 10 Oct 2001 08:35:13 +0200 (CEST)

The following security advisory is sent to the securiteam mailing list, and can be found at the SecuriTeam web site: http://www.securiteam.com
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  Security Bug Found in W3Mail Webmail
------------------------------------------------------------------------

SUMMARY

 <http://www.w3mail.org/> W3Mail is a full featured webmail application. A
security vulnerability in the product allows attackers to cause the CGI to
execute arbitrary code.

DETAILS

Vulnerable systems:
 * W3Mail 1.0.2 Personal and Commercial version (and prior)

The CGI script used by the program does not check for special
meta-characters like &;`'\"|*?~<>^()[]{}$\n\r. This would allow any
webmail user could execute UNIX commands on web server.

Example:
On any field at "Compose Message", put something like:
(Recipient example)
foo@bar.com"; `/bin/touch /tmp/foobar`; $foo = "bar

and an empty file will be created at /tmp/foobar.

ADDITIONAL INFORMATION

The information has been provided by <mailto:corb@sekure.org> Emanuel
Almeida.

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