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Microsoft ISA Server 2000 Error Page Cross Site Scripting
Secunia Advisory: SA8812
Release Date: 2003-05-20
Last Update: 2003-07-16
Popularity: 8,025 views

Critical:
Less critical
Impact: Cross Site Scripting
Where: From remote
Solution Status: Vendor Patch

Software:Microsoft ISA Server 2000

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CVE reference:CVE-2003-0526


Description:
A vulnerability has been identified in Microsoft ISA Server 2000 allowing malicious HTML documents to conduct Cross Site Scripting against arbitrary sites.

The problem is that the data supplied in the "VIA" header is returned in an error page without being sanitised, when ISA Server fails to connect to the remote host.

By creating a malicious document, which uses the ActiveX Object "Microsoft.XMLHTTP" to conduct a specially crafted request for any other website to a closed port, it is possible to read cookies and more. This is possible to do because JavaScript and other client side scripting injected in the "VIA" header will be executed in the client as if it originated from the requested site.

An exploit has been released.

Solution:
Apply patch.

English:
http://download.microsoft.com/downloa...69b25eaa7822/ISA2000-KB816456-x86.exe

French:
http://download.microsoft.com/downloa...321269f1afde/ISA2000-KB816456-x86.exe

German:
http://download.microsoft.com/downloa...70cc468139ae/ISA2000-KB816456-x86.exe

Spanish:
http://download.microsoft.com/downloa...64c47e42f078/ISA2000-KB816456-x86.exe

Japanese:
http://download.microsoft.com/downloa...caef3f190146/ISA2000-KB816456-x86.exe

Provided and/or discovered by:
Hugo Vazquez Carames & Toni Cortes Martinez

Changelog:
2003-07-16: Microsoft issues Security Bulletin MS03-028 and patches.

Original Advisory:
http://www.microsoft.com/technet/security/bulletin/MS03-028.asp

Other References:
http://www.infohacking.com/INFOHACKIN...r_Advisories/ISA_Server_XSS/index.htm


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