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[ISR] - Novell GroupWise Client Integer Overflow
From: Francisco Amato <famato () infobyte com ar>
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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