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[SA12749] ASP.NET Canonicalization Vulnerability
From: Secunia Security Advisories (sec-adv
secunia.com)
Date: Fri Oct 08 2004 - 03:19:49 CDT
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TITLE:
ASP.NET Canonicalization Vulnerability
SECUNIA ADVISORY ID:
SA12749
VERIFY ADVISORY:
http://secunia.com/advisories/12749/
CRITICAL:
Moderately critical
IMPACT:
Security Bypass
WHERE:
From remote
SOFTWARE:
Microsoft .NET Framework 1.x
http://secunia.com/product/667/
ASP.NET 1.x
http://secunia.com/product/2173/
DESCRIPTION:
Toby Beaumont has reported a vulnerability in ASP.NET, which can be
exploited by malicious people to bypass certain security
restrictions.
The vulnerability is caused due to a canonicalization error within
the .NET authentication schema. This can be exploited to bypass forms
based authentication or Windows authorization configurations by using
a specially crafted URL.
Example:
http://[victim]/secure%5Cfile.apx
Successful exploitation can e.g. lead to exposure of sensitive
information.
The vulnerability reportedly affects all versions of ASP.NET for all
versions of IIS.
SOLUTION:
Apply ASP.NET ValidatePath module.
http://www.microsoft.com/downloads/details.aspx?FamilyId=DA77B852-DFA0-4631-AAF9-8BCC6C743026
PROVIDED AND/OR DISCOVERED BY:
Toby Beaumont
ORIGINAL ADVISORY:
Microsoft:
http://www.microsoft.com/security/incident/aspnet.mspx
http://support.microsoft.com/?kbid=887459
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