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Secunia Advisory SA12749

Microsoft .NET Framework URL Path Validation Canonicalization Vulnerability
Secunia Advisory SA12749
Secunia VIM 4.0 - Free Trial
Release Date 2004-10-08
Last Update 2005-11-21
   
Popularity 19,842 views
Comments 0 comments

Criticality level Moderately criticalModerately critical
Impact Security Bypass
Where From remote
Authentication level This information is available to Secunia VIM customers
   
Report reliability This information is available to Secunia VIM customers
Solution Status Vendor Patch
   
Systems affected This information is available to Secunia VIM customers
Approve distribution This information is available to Secunia VIM customers
   
Software:
ASP.NET 1.x
Microsoft .NET Framework 1.x

Secunia CVSS Score This information is available to Secunia VIM Customers
CVE Reference(s) CVE-2004-0847 CVSS score available to Secunia VIM customers
  

Description

Toby Beaumont has reported a vulnerability in Microsoft .NET Framework, which can be exploited by malicious people to bypass certain security restrictions.

The vulnerability is caused due to a canonicalization error in the ASP.NET component's authentication schema when validating URL paths. 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.


Solution
Apply patches.
Further details available to Secunia VIM customers

Provided and/or discovered by
Toby Beaumont

Changelog
Further details available to Secunia VIM customers

Original Advisory
MS05-004 (KB887219):
http://www.microsoft.com/technet/security/bulletin/ms05-004.mspx

Other references
Further details available to Secunia VIM customers

Deep Links
Links available to Secunia VIM customers


Do you have additional information related to this advisory?

Please provide information about patches, mitigating factors, new versions, exploits, faulty patches, links, and other relevant data by posting comments to this Advisory. You can also send this information to vuln@secunia.com

Subject: Microsoft .NET Framework URL Path Validation Canonicalization Vulnerability
 
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