Novell GroupWise Client Integer Overflow

Risk: Medium
Local: No
Remote: Yes

CVSS Base Score: 5/10
Impact Subscore: 2.9/10
Exploitability Subscore: 10/10
Exploit range: Remote
Attack complexity: Low
Authentication: No required
Confidentiality impact: None
Integrity impact: None
Availability impact: Partial

|| || [ISR] || Infobyte Security Research || || 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: .:: 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_USERSoftwareNovellGroupWiseLogin ParametersTCP/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 "" EDX 01F6ADC0 ASCII "" 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: ype= kc&externalId=10098814html&sliceId=&dialogID=717171 Vendor patch: .:: 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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