[NT] Vulnerability in Windows Explorer Allows Code Execution (MS08-038)
- From: SecuriTeam <support@xxxxxxxxxxxxxx>
- Date: 9 Jul 2008 14:32:48 +0200
The following security advisory is sent to the securiteam mailing list, and can be found at the SecuriTeam web site: http://www.securiteam.com
- - promotion
The SecuriTeam alerts list - Free, Accurate, Independent.
Get your security news from a reliable source.
http://www.securiteam.com/mailinglist.html
- - - - - - - - -
Vulnerability in Windows Explorer Allows Code Execution (MS08-038)
------------------------------------------------------------------------
SUMMARY
This security update resolves a publicly reported vulnerability in Windows
Explorer that could allow remote code execution when a specially crafted
saved-search file is opened and saved. If a user is logged on with
administrative user rights, an attacker who successfully exploited this
vulnerability could take complete control of an affected system. An
attacker could then install programs; view, change, or delete data; or
create new accounts with full user rights. Users whose accounts are
configured to have fewer user rights on the system could be less impacted
than users who operate with administrative user rights.
This security update is rated Important for all supported editions of
Windows Vista and Windows Server 2008. For more information, see the
subsection, Affected and Non-Affected Software, in this section.
DETAILS
Affected Software:
*
<http://www.microsoft.com/downloads/details.aspx?familyid=06739ca6-7368-4acb-bb67-7e8146071a29> Windows Vista and Windows Vista Service Pack 1 - Remote Code Execution - Important - None
*
<http://www.microsoft.com/downloads/details.aspx?familyid=74ea0893-7c2f-4fad-ad27-588ad953b046> Windows Vista x64 Edition and Windows Vista x64 Edition Service Pack 1 - Remote Code Execution - Important - None
*
<http://www.microsoft.com/downloads/details.aspx?familyid=189a4170-b495-4904-9cbd-209e7494d303> Windows Server 2008 for 32-bit Systems* - Remote Code Execution - Important - None
*
<http://www.microsoft.com/downloads/details.aspx?familyid=85d8701d-f8c7-4079-8a21-a3a9d5ba71ce> Windows Server 2008 for x64-based Systems* - Remote Code Execution - Important - None
*
<http://www.microsoft.com/downloads/details.aspx?familyid=b30ee4f0-850f-4ff3-86a4-663603a0a802> Windows Server 2008 for Itanium-based Systems - Remote Code Execution - Important - None
*Windows Server 2008 server core installation affected. For supported
editions of Windows Server 2008, this update applies, with the same
severity rating, whether or not Windows Server 2008 was installed using
the Server Core installation option.
Non-Affected Software:
* Microsoft Windows 2000 Service Pack 4
* Windows XP Service Pack 2 and Windows XP Service Pack 3
* Windows XP Professional x64 Edition and Windows XP Professional x64
Edition Service Pack 2
* Windows Server 2003 Service Pack 1 and Windows Server 2003 Service Pack
2
* Windows Server 2003 x64 Edition and Windows Server 2003 x64 Edition
Service Pack 2
* Windows Server 2003 with SP1 for Itanium-based Systems and Windows
Server 2003 with SP2 for Itanium-based Systems
Windows Saved Search Vulnerability - CVE-2008-1435
A remote code execution vulnerability exists when saving a specially
crafted search file within Windows Explorer. This operation causes Windows
Explorer to exit and restart in an exploitable manner.
CVE Information:
<http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1435>
CVE-2008-1435
Mitigating Factors for Windows Saved Search Vulnerability - CVE-2008-1435
Mitigation refers to a setting, common configuration, or general
best-practice, existing in a default state, that could reduce the severity
of exploitation of a vulnerability. The following mitigating factors may
be helpful in your situation:
* The vulnerability cannot be exploited automatically through e-mail. For
an attack to be successful, a user must open and save an attachment that
is sent in an e-mail message.
* In a Web-based attack scenario, an attacker could host a Web site that
contains a malformed saved-search (.search-ms) file. In addition,
compromised Web sites and Web sites that accept or host user-provided
content or advertisements could contain specially crafted content that
could exploit this vulnerability. In all cases, however, an attacker would
have no way to force users to visit these Web sites. Attempts to exploit
this vulnerability require user interaction.
* An attacker who successfully exploited this vulnerability could gain
the same user rights as the local user. Users whose accounts are
configured to have fewer user rights on the system could be less affected
than users who operate with administrative user rights.
Workarounds for Windows Saved Search Vulnerability - CVE-2008-1435
Workaround refers to a setting or configuration change that does not
correct the underlying vulnerability but would help block known attack
vectors before you apply the update. Microsoft has tested the following
workarounds and states in the discussion whether a workaround reduces
functionality.
* Temporarily change the file type associated with the .search-ms file
extension. Enter the following command at an elevated command prompt:
assoc .search-ms=xmlfile
Impact of workaround. Saved-search files will open as XML files in
Internet Explorer.
How to undo the workaround. Enter the following command at an elevated
command prompt:
assoc .search-ms=SearchFolder
* Modify the registry to deny users the ability to open saved-search
files or to access the saved search folder.
To modify the registry key, follow these steps:
Note Using Registry Editor incorrectly can cause serious problems that may
require you to reinstall your operating system. Microsoft cannot guarantee
that problems resulting from the incorrect use of Registry Editor can be
solved. Use Registry Editor at your own risk. For information about how to
edit the registry, view the "Changing Keys And Values" Help topic in
Registry Editor (Regedit.exe) or view the "Add and Delete Information in
the Registry" and "Edit Registry Data" Help topics in Regedt32.exe.
1. Click Start, click Run, type Regedit in the Open box, and then click
OK.
2. Locate and then expand the following registry subkey:
HKEY_CLASSES_ROOT\SearchFolder
Click Edit, and then click Permissions
Note Make a note of the permissions that are listed in this dialog box so
that you can restore them to their original values at a later time.
3. Click Advanced.
4. Click to clear the Include inheritable permissions from this object's
parent check box. You are prompted to click Copy, Remove, or Cancel. Click
Remove, and then click OK.
5. You receive a message that states that no one will be able to access
this registry key. Click Yes, and then click OK to close the Permissions
for SearchFolder dialog box.
Impact of workaround. Users will be unable to open saved search files or
access the saved search folder.
How to undo the workaround. Restore the previously configured permissions
on the registry key by clicking to check Include inheritable permissions
from this object's parent and then clicking OK two times.
* Unregister the SearchFolder file type.
To modify the registry key, follow these steps:
Note Using Registry Editor incorrectly can cause serious problems that may
require you to reinstall your operating system. Microsoft cannot guarantee
that problems resulting from the incorrect use of Registry Editor can be
solved. Use Registry Editor at your own risk. For information about how to
edit the registry, view the "Changing Keys And Values" Help topic in
Registry Editor (Regedit.exe) or view the "Add and Delete Information in
the Registry" and "Edit Registry Data" Help topics in Regedt32.exe.
Using the Interactive Method
1. Click Start, click Run, type Regedit in the Open box, and then click
OK.
2. Locate and then click the following registry subkey:
HKEY_CLASSES_ROOT\SearchFolder
3. Click the File menu and select Export.
4. In the Export Registry File dialog box, enter
SearchFolder_file_association_registry_backup.reg and click Save.
Note This will create a backup of this registry key in the My
Documentsfolder by default.
5. Press the Delete key on the keyboard to delete the registry key. When
prompted to delete the registry key via the Confirm Key Delete dialog box,
click Yes.
Using a Managed Deployment Script
1. Create a backup copy of the registry keys by using a managed deployment
script that contains the following commands:
Regedit.exe /e SearchFolder_registry_backup.reg
HKEY_CLASSES_ROOT\SearchFolder
2. Next, save the following to a file with a .REG extension, such as
Delete_SearchFolder_file_association.reg:
Windows Registry Editor Version 5.00
[-HKEY_CLASSES_ROOT\SearchFolder]
3. Run the above registry script on the target machine with the following
command from an elevated command prompt:
Regedit.exe /s Delete_SearchFolder_file_association.reg
Impact of workaround. Double-clicking on a saved search folder will no
longer open a window displaying the search results.
How to undo the workaround:
Using the Interactive Method
1. Click Start, click Run, type Regedit in the Open box, and then click
OK.
2. Click the File menu and select Import.
3. In the Import Registry File dialog box, select
SearchFolder_file_association_registry_backup.reg and click Open.
Using a Managed Deployment Script
Restore the original state by running the following command:
Regedit.exe /s SearchFolder_registry_backup.reg
ADDITIONAL INFORMATION
The information has been provided by Microsoft Product Security.
The original article can be found at:
<http://www.microsoft.com/technet/security/bulletin/ms08-038.mspx>
http://www.microsoft.com/technet/security/bulletin/ms08-038.mspx
========================================
This bulletin is sent to members of the SecuriTeam mailing list.
To unsubscribe from the list, send mail with an empty subject line and body to: list-unsubscribe@xxxxxxxxxxxxxx
In order to subscribe to the mailing list, simply forward this email to: list-subscribe@xxxxxxxxxxxxxx
====================
====================
DISCLAIMER:
The information in this bulletin is provided "AS IS" without warranty of any kind.
In no event shall we be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages.
- Prev by Date: [NT] Vulnerabilities in Outlook Web Access for Exchange Server Allows Elevation of Privilege (MS08-039)
- Next by Date: [NT] Vulnerabilities in DNS Allows Spoofing (MS08-037)
- Previous by thread: [NT] Vulnerabilities in Outlook Web Access for Exchange Server Allows Elevation of Privilege (MS08-039)
- Next by thread: [NT] Vulnerabilities in DNS Allows Spoofing (MS08-037)
- Index(es):
Relevant Pages
|
