Vulnerability CVE-2008-3843
Published: 2008-08-27   Modified: 2012-02-12

Description:
Request Validation (aka the ValidateRequest filters) in ASP.NET in Microsoft .NET Framework with the MS07-040 update does not properly detect dangerous client input, which allows remote attackers to conduct cross-site scripting (XSS) attacks, as demonstrated by a query string containing a "<~/" (less-than tilde slash) sequence followed by a crafted STYLE element.

See advisories in our WLB2 database:
Topic
Author
Date
Low
Bypassing ASP .NET \"ValidateRequest\" for Script Injection Attacks
ProCheckUp Resea...
28.08.2008

Type:

CWE-79

 (Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting'))

CVSS2 => (AV:N/AC:M/Au:N/C:N/I:P/A:N)

CVSS Base Score
Impact Subscore
Exploitability Subscore
4.3/10
2.9/10
8.6/10
Exploit range
Attack complexity
Authentication
Remote
Medium
No required
Confidentiality impact
Integrity impact
Availability impact
None
Partial
None
Affected software
Microsoft -> .net framework 

 References:
http://securityreason.com/securityalert/4193
http://www.procheckup.com/PDFs/bypassing-dot-NET-ValidateRequest.pdf
http://www.procheckup.com/Vulnerability_PR08-20.php
http://www.securityfocus.com/archive/1/495667/100/0/threaded
http://www.securityfocus.com/archive/1/496071/100/0/threaded
https://exchange.xforce.ibmcloud.com/vulnerabilities/44743
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