[VulnWatch] Buffer Overflow in EF Commander 3.54

From: Peter Winter-Smith (peter4020_at_hotmail.com)
Date: 07/26/03

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    To: vulnwatch@vulnwatch.org, vuln@secunia.com, bugs@securitytracker.com
Date: Sat, 26 Jul 2003 00:32:00 +0000

    Buffer Overflow in EF Commander 3.54

    Url: http://www.efsoftware.com

    "EF Commander is a file manager, archiver, viewer, FTP-client for
    the Windows 95/98/Me, Windows NT 4.0, Windows 2000 and Windows XP
    desktop. If you've ever used and liked Norton Commander, you'll like
    this dual-windowed program, which comes complete with bubble and
    online help. You can search directory trees and directories and
    perform actions, including Run, on files. You can also check file
    attributes and edit files with search-and-replace and drag-and-drop.
    Use the internal editor or associate one of your choosing to edit files,
    easily view files and configure the buttons to suit your needs, and get
    system and disk information with a click of the mouse."
    - EFSoftware Website

    Indeed it is quite remarkable, sporting a huge number of extra features
    which make the $25.00 registration fee (when using paypal) a definite
    bargin!

    See: http://www.efsoftware.com/order/e.htm for order information.

    I have noticed that EF Commander 3.54 (and possibly earlier versions)
    are vulnerable to a buffer overflow in the FTP banner and other areas.
    These can be replicated as follows:

    FTP Banner:
    ===========
    (EF Commander 3.54 connected...)
         PADDING EBP EIP
    220 [508xA][4xB][4xX] // Totalling 516+4 Bytes
    (Access violation when executing 0x58585858) // 4xX

    When sending the overly long packet as the FTP banner, the overflow
    does not often take an immediate effect, however when sending it as
    part of another response, it is immediate.

    Potentially an attacker would be able to execute arbitrary code on
    the system of an unsuspecting user.

    Since I would not have access to a computer for a while, I thought
    it best to contact the vendor, and release the advisory together,
    as I very much doubt that any trouble will come from the knowledge
    of this security hole, especially before a patch can be made known.

    Please visit EFSoftware's website:

    http://www.efsoftware.com

    And check for an updated version, greater than 3.54, which will
    doubtless be patched against this bug.

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

    Operating system and servicepack level:
    Windows 9x/Me/NT Based

    Software:
    EF Commander 3.54 (Possibly Earlier Versions)

    Under what circumstances the vulnerability was discovered:
    Under a vulnerability search.

    If the vendor has been notified:
    Yes, concurrent with the release of this advisory.

    How to contact you for further information:
    I can always be reached at peter4020@hotmail.com

    Please credit this find to:
    Peter Winter-Smith

    Thank you for your time,
    -Peter

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