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Category:   OS (Microsoft)  >   Windows Compressed Folders Vendors:   Microsoft
Microsoft Windows Operating System Compressed Folders Allow Arbitrary Files to Be Created
SecurityTracker Alert ID:  1005336
SecurityTracker URL:  http://securitytracker.com/id/1005336
CVE Reference:   CAN-2002-1139   (Links to External Site)
Date:  Oct 3 2002
Impact:   Modification of system information, Modification of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in the file decompression components of Microsoft Windows 98, Me, and XP. A remote user could supply a malicious zip file that, when opened by the target user, would cause arbitrary files to be created on the target user's computer.

A vulnerability reportedly exists in the software that decompresses files from a zipped archive. A malformed file path in a zipped archive could cause Windows to extract the file to an arbitrary location.

Microsoft reported that on Windows 98 with Plus! Pack, Windows Me, and Windows XP, the "Compressed Folders" feature allows zipped files to be treated by the operating system as folders. This function is apparently not installed by default on Windows 98.

[Editor s note: A similar flaw was recently reported in the Unix tar utility.]

Microsoft credits zen-parse for reporting this flaw.

Impact:   A remote user could supply a zipped archive with a specially crafted filename that, when opened by the target user, could cause the extracted file to be placed in an arbitrary directory instead of the intended directory.
Solution:   The vendor has released patches:

For Windows 98 with Plus! Pack:

http://www.microsoft.com/windows98/downloads/contents/WUCritical/q329048/default.asp

For Windows Me:

User Windows Update.

For Windows XP:

http://www.microsoft.com/Downloads/Release.asp?ReleaseID=43419

According to the bulletin, this patch can be installed on Windows 98 or Windows 98 Second Edition, on Windows Millennium Edition, or on Windows XP Gold and Windows XP SP1.

Microsoft plans to include the fix in Windows XP SP2.

Microsoft plans to issue Knowledge Base article Q329048 regarding this issue, to be available shortly on the Microsoft Online Support web site:

http://support.microsoft.com/?scid=fh;en-us;kbhowto

Vendor URL:  www.microsoft.com/technet/security/bulletin/MS02-054.asp (Links to External Site)
Cause:   Access control error, Input validation error
Underlying OS:   Windows (Me), Windows (98), Windows (XP)

Message History:   None.


 Source Message Contents

Date:  Wed, 2 Oct 2002 20:35:30 -0700
Subject:  Microsoft Security Bulletin MS02-054: Unchecked Buffer in File Decompression Functions Could Lead to Code Execution (Q329048)


-----BEGIN PGP SIGNED MESSAGE-----

- ----------------------------------------------------------------------
Title:      Unchecked Buffer in File Decompression Functions Could
            Lead to Code Execution (Q329048)
Date:       02 October 2002
Software:   Microsoft Windows 98 with Plus! Pack, Windows Me,
            or Windows XP 
Impact:     Two vulnerabilities, the most serious of which could
            run code of attacker?s choice 
Max Risk:   Moderate
Bulletin:   MS02-054

Microsoft encourages customers to review the Security Bulletin at: 
http://www.microsoft.com/technet/security/bulletin/MS02-054.asp.
- ----------------------------------------------------------------------

Issue:
======
Zipped files (files having a .zip extension) provide a means to 
store information in a way that uses less space on a hard disk. This
is accomplished by compressing the files that are put into in the
zipped file. On Windows 98 with Plus! Pack, Windows Me and Windows
XP, the Compressed Folders feature allows zipped files to be treated
as folders. The Compressed Folders feature can be used to create,
add files to, and extract files from zipped files. 

Two vulnerabilities exist in the Compressed Folders function: 

 - An unchecked buffer exists in the programs that handles the
   decompressing of files from a zipped file. A security
   vulnerability results because attempts to open a file with
   a specially malformed filename contained in a zipped file could
   possibly result in Windows Explorer failing, or in code of the
   attacker?s choice being run. 
 - The decompression function could place a file in a directory
   that was not the same as, or a child of, the target directory
   specified by the user as where the decompressed zip files should
   be placed. This could allow an attacker to put a file in a known
   location on the users system, such as placing a program in a
   startup directory 

Mitigating Factors:
====================
 - The vulnerabilities could not be exploited without user
   intervention. The attacker would need to entice the user to
   receive, store, and open the zipped file provided by the
   attacker. 
 - The vulnerabilities could not be exploited remotely. An attacker
   would need to lure a user into receiving the zipped file onto
   the user?s machine. Best practices suggest users not accept
   e-mail attachments from people who are not trusted, and not to
   download files from untrusted Internet sites. 
 - On Windows 98 and Windows Me, the Compressed Folders feature is
   not installed by default. Users who had not installed this
   feature would not be vulnerable. 

Risk Rating:
============
 - Internet systems: Low
 - Intranet systems: Low
 - Client systems: Moderate

Patch Availability:
===================
 - A patch is available to fix this vulnerability. Please read the 
   Security Bulletin at
   http://www.microsoft.com/technet/security/bulletin/ms02-054.asp
   for information on obtaining this patch.

Acknowledgment:
===============
 - Joe Testa of Rapid7, Inc. (http://www.rapid7.com/) for reporting
   the Unchecked Buffer in Zipped File Handling vulnerability. 
 - zen-parse for reporting the Incorrect Target Path for Zipped
   File Decompression vulnerability.

- ---------------------------------------------------------------------

THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS
PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS
ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES
OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY
DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL,
CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF
MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE
POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION
OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES
SO THE FOREGOING LIMITATION MAY NOT APPLY.

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