Novell Groupwise Client Remote Buffer Overflow


.:: SUMMARY

Novell GroupWise Client Remote Buffer 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 file 
that contain the labels of different views. 

To reproduce this, we have to modify the ofview file that corresponds to the 
language of the postoffices. In spanish lenguage it is GWVW02ES.INI
([POSTOFFICES]\ofviews\win\GWVW02ES.INI) 

For example, we take the section [Group Task] and set the label
ES02TKS.VEW with the value ("A" x 174). 

Then, when we open the application client and make the authentication, after 
that occur the buffer overflow. 

Information of Registers:
EAX 00000001
ECX 7FFDE000
EDX 00E80608
EBX 41414141
ESP 0012F74C
EBP 0012F7B0
ESI 00E80000
EDI 41414139
EIP 78495BA9 ntdll.78495BA9
C 0 ES 0023 32bit 0(FFFFFFFF)
P 1 CS 001B 32bit 0(FFFFFFFF)
A 0 SS 0023 32bit 0(FFFFFFFF)
Z 1 DS 0023 32bit 0(FFFFFFFF)
S 0 FS 0038 32bit 7FFDE000(FFF)
T 0 GS 0000 NULL
D 0
O 0 LastErr ERROR_SUCCESS (00000000)
EFL 00010246 (NO,NB,E,BE,NS,PE,GE,LE)
ST0 empty - NAN FFFF FFF8FCF8 FFF8FCF8
ST1 empty - ??? FFFF 00000000 00000000
ST2 empty - ??? FFFF 00FE00F7 00FB00F7
ST3 empty - ??? FFFF 00FE00F7 00FB00F7
ST4 empty - NAN FFFF FFF8FCF8 FFF8FCF8
ST5 empty - ??? FFFF 00FF00F8 00FC00F8
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:
78495BA9 0FB707 MOVZX EAX,WORD PTR DS:[EDI] 

If a attacker have access to the postoffices and put a evil GWVW02??.INI, He 
could have the posibilite of compromise every user that use the Novell 
GroupWise Windows Application. 

.:: VENDOR RESPONSE

Vendor advisory:
    http://support.novell.com/cgi-bin/search/searchtid.cgi?/10098314.htm

Vendor patch:
    http://support.novell.com/cgi-bin/search/searchtid.cgi?/2971927.htm
    
.:: DISCLOSURE TIMELINE

07/05/2005  Initial vendor notification
07/06/2005  Initial vendor response
07/27/2005  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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