[ISR] - Novell GroupWise Client Integer Overflow

From: Francisco Amato (famato_at_infobyte.com.ar)
Date: 09/27/05

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    To: full-disclosure@lists.grok.org.uk
Date: Tue, 27 Sep 2005 10:57:57 -0300

    ||
    || [ISR]
    || Infobyte Security Research
    || www.infobyte.com.ar
    || 09.27.2005
    ||

    .:: SUMMARY

    Novell GroupWise Client Integer Overflow

    Version: GroupWise 6.5.3, It is suspected that all previous versions of
    Groupwise Client
    are vulnerable.

    .:: BACKGROUND

    GroupWise Client is Novell's premier Intranet/Internet GroupWare solution
    for platform Windows.

    More info: http://www.novell.com

    .:: DESCRIPTION

    This issue is due to a failure of the application to securely parse the
    saved port number of the last authentication store in windows register.

    To reproduce this, we have to modify the default register key of
    HKEY_CURRENT_USER\Software\Novell\GroupWise\Login Parameters\TCP/IP Port

    For example, set the value (11111111111111111111111111111111).

    Then, when we open the application client and the client get the port
    information occur the integer overflow.

    EAX C71C71C7
    ECX 01F6ADC0 ASCII "10.1.1.1"
    EDX 01F6ADC0 ASCII "10.1.1.1"
    EBX 00000000
    ESP 0012E9DC
    EBP 0012E9EC
    ESI 00000000
    EDI 00000000
    EIP 52080AB3 gwenv1.52080AB3
    C 0 ES 0023 32bit 0(FFFFFFFF)
    P 0 CS 001B 32bit 0(FFFFFFFF)
    A 1 SS 0023 32bit 0(FFFFFFFF)
    Z 0 DS 0023 32bit 0(FFFFFFFF)
    S 1 FS 0038 32bit 7FFDE000(FFF)
    T 0 GS 0000 NULL
    D 0
    O 0 LastErr ERROR_SUCCESS (00000000)
    EFL 00010292 (NO,NB,NE,A,S,PO,L,LE)
    ST0 empty -NAN FFFF FFFCFEFC FFFCFEFC
    ST1 empty -??? FFFF 00000000 00000000
    ST2 empty -??? FFFF 00FE00FB 00FD00FB
    ST3 empty -??? FFFF 00FE00FB 00FD00FB
    ST4 empty -NAN FFFF FFFCFEFC FFFCFEFC
    ST5 empty -??? FFFF 00FF00FC 00FE00FC
    ST6 empty -??? FFFF 00000000 00000000
    ST7 empty 256.00000000000000000
    3 2 1 0 E S P U O Z D I
    FST 0000 Cond 0 0 0 0 Err 0 0 0 0 0 0 0 0 (GT)
    FCW 027F Prec NEAR,53 Mask 1 1 1 1 1 1

    Asm code line:
    52080AB3 66:8B00 MOV AX,WORD PTR DS:[EAX]

    .:: VENDOR RESPONSE

    Vendor advisory:
       
    http://support.novell.com/techcenter/search/search.do?cmd=displayKC&docType=
    kc&externalId=10098814html&sliceId=&dialogID=717171

    Vendor patch:
       http://support.novell.com/cgi-bin/search/searchtid.cgi?/2972191.htm

    .:: DISCLOSURE TIMELINE

    07/28/2005 Initial vendor notification
    07/28/2005 Initial vendor response notify research
    08/07/2005 Second vendor response
    09/27/2005 Coordinated public disclosure

    .:: CREDIT

    Francisco Amato is credited with discovering this vulnerability.
    famato][at][infobyte][dot][com][dot][ar

    .:: LEGAL NOTICES

    Copyright (c) 2005 by [ISR] Infobyte Security Research.
    Permission to redistribute this alert electronically is granted as long as
    it is not
    edited in any way unless authorized by Infobyte Security Research Response.
    Reprinting the whole or part of this alert in any medium other than
    electronically
    requires permission from infobyte com ar

    Disclaimer
    The information in the advisory is believed to be accurate at the time of
    publishing
    based on currently available information. Use of the information constitutes
    acceptance
    for use in an AS IS condition. There are no warranties with regard to this
    information.
    Neither the author nor the publisher accepts any liability for any direct,
    indirect, or
    consequential loss or damage arising from use of, or reliance on, this
    information.

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