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Category:   Application (Generic)  >   Microsoft .NET Vendors:   Microsoft
(Vendor Issues Fix) Microsoft .NET Forms Authentication Can Be Bypassed By Remote Users
SecurityTracker Alert ID:  1013109
SecurityTracker URL:  http://securitytracker.com/id/1013109
CVE Reference:   CVE-2004-0847   (Links to External Site)
Date:  Feb 8 2005
Impact:   User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 1.0, 1.1
Description:   A vulnerability was reported in Microsoft .NET in the forms authentication. A remote user can bypass the authentication process.

In September 2004, Toby Beaumont reported that a remote user can supply an HTTP GET request with a specially crafted URL that contains a backslash instead of a forward slash to gain access to the requested resource without having to authenticate.

An demonstration exploit example URL is of the following format:

http://[target]/secure\somefile.aspx

Impact:   A remote user can gain access to restricted resources without having to authenticate.
Solution:   The vendor has issued the following fixes:

.NET Framework 1.0 Service Pack 3 for:

Windows 2000 Service Pack 3 or Service Pack 4
Windows XP Service Pack 1 or Windows XP Service Pack 2,
Windows Server 2003

http://www.microsoft.com/downloads/details.aspx?FamilyId=4E6D56E5-3D8D-423B-99A1-41EDF23D65BC


.NET Framework 1.0 Service Pack 3 for:

Windows XP Tablet PC Edition
Windows XP Media Center Edition

http://www.microsoft.com/downloads/details.aspx?FamilyId=33D4D33E-473F-4842-A3A8-C8266AEE8FAB


.NET Framework 1.0 Service Pack 2 for:

Windows 2000 Service Pack 3 or Service Pack 4
Windows XP Service Pack 1 or Windows XP Service Pack 2,
Windows Server 2003

http://www.microsoft.com/downloads/details.aspx?FamilyId=3271ACD5-EE3C-4BDF-AE28-56D2DF77151E


.NET Framework 1.0 Service Pack 2 for:

Windows XP Tablet PC Edition
Windows XP Media Center Edition

http://www.microsoft.com/downloads/details.aspx?FamilyId=EE611D27-52CF-43DB-BB97-21318C7FAA70


.NET Framework 1.1 Service Pack 1 for:

Windows 2000 Service Pack 3 or Service Pack 4
Windows XP Service Pack 1 or Windows XP Service Pack 2,
Windows XP Tablet PC Edition
Windows XP Media Center Edition

http://www.microsoft.com/downloads/details.aspx?FamilyId=8EC6FB8A-29EB-49CF-9DBC-1A0DC2273FF9


.NET Framework 1.1 Service Pack 1 for:

Windows Server 2003

http://www.microsoft.com/downloads/details.aspx?FamilyId=9BBD5617-49AE-40BF-B0FA-F9049349C6F5


.NET Framework 1.1 for:

Windows 2000 Service Pack 3 or Service Pack 4
Windows XP Service Pack 1 or Windows XP Service Pack 2,
Windows XP Tablet PC Edition
Windows XP Media Center Edition

http://www.microsoft.com/downloads/details.aspx?FamilyId=C5E19719-000F-456A-BEAB-5BD7949F8AA2


.NET Framework 1.1 for:

Windows Server 2003

http://www.microsoft.com/downloads/details.aspx?FamilyId=E54BE8BE-22AF-4390-86E1-25D76794D5C7

A restart is required after applying this update.

Vendor URL:  www.microsoft.com/technet/security/bulletin/ms05-004.mspx (Links to External Site)
Cause:   Access control error, Input validation error
Underlying OS:  Windows (Any)

Message History:   This archive entry is a follow-up to the message listed below.
Oct 7 2004 Microsoft .NET Forms Authentication Can Be Bypassed By Remote Users



 Source Message Contents



[Original Message Not Available for Viewing]


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