SecurityReason - Bypassing ASP .NET "ValidateRequest" for Script Injection Attacks

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Details : SecurityAlert

Topic :

Bypassing ASP .NET "ValidateRequest" for Script Injection Attacks

SecurityAlert : 4193

CVE : CVE-2008-3842

CVE : CVE-2008-3843

CWE : CWE-79

SecurityRisk : Low alert

alert

(About)

Remote Exploit : Yes

Local Exploit : No

Victim interaction required : Yes

Exploit Given : No

Credit : ProCheckUp Research;

Published : 28.08.2008

Affected Software :

Microsoft, .net_framework, 1.0, Service Pack 3;
Microsoft, .net_framework, 1.1, Service Pack 1;
Microsoft, .net_framework, 2.0;

Advisory Text :

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

The Microsoft .NET framework comes with a request validation feature,
configurable by the ValidateRequest setting. ValidateRequest has been a
feature of ASP.NET since version 1.1. This feature consists of a series
of filters, designed to prevent classic web input validation attacks
such as HTML injection and XSS (Cross-site Scripting). This paper
introduces script injection payloads that bypass ASP .NET web validation
filters and also details the trial-and-error procedure that was followed
to reverse-engineer such filters by analyzing .NET debug errors.

The original version of this paper was released in January 2006 for
private CPNI distribution. This paper has now been updated in August
2008 to include additional materials such as input payloads that bypass
the latest anti-XSS .NET patches (MS07-40) released in July 2007.

Paper:

http://www.procheckup.com/PDFs/bypassing-dot-NET-ValidateRequest.pdf

Advisory:

http://www.procheckup.com/Vulnerability_PR08-20.php
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.6 (GNU/Linux)

iD8DBQFIrctJoR/Hvsj3i8sRAjEWAJ9DjcWdNiGcEykEphn71QJqzB05OgCeOznJ
NVERfW1rIgUZyMWaKcMiSn8=
=lTNm
-----END PGP SIGNATURE-----

References :

http://www.securityfocus.com/archive/1/archive/1/495667/100/0/threaded
http://www.procheckup.com/PDFs/bypassing-dot-NET-ValidateRequest.pdf

Feedback :

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