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Vigil@nce: Microsoft ASP.NET, Cross Site Scripting via ViewState

February 2010 by Vigil@nce

When ViewState are not signed by Microsoft ASP.NET, an attacker can generate a Cross Site Scripting.

- Severity: 2/4
- Consequences: client access/rights
- Provenance: document
- Means of attack: no proof of concept, no attack
- Ability of attacker: expert (4/4)
- Confidence: confirmed by the editor (5/5)
- Diffusion of the vulnerable configuration: high (3/3)
- Creation date: 10/02/2010

IMPACTED PRODUCTS

- Microsoft .NET Framework

DESCRIPTION OF THE VULNERABILITY

An ASP page can use a hidden variable named __VIEWSTATE, containing the state of a form, encoded in base64.

Some applications directly display data from the ViewState on the web page returned to the client, without filtering them to ensure they do not contain JavaScript code. In this case, and if the ViewState is not signed, an attacker can therefore encode a malicious script in base64, and then send it in the __VIEWSTATE variable.

When ViewState are not signed by Microsoft ASP.NET, an attacker can therefore generate a Cross Site Scripting.

CHARACTERISTICS

- Identifiers: TWSL2010-001, VIGILANCE-VUL-9439
- Url: http://vigilance.fr/vulnerability/M...




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