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Vigil@nce - Ruby: Cross Site Scripting via WEBrick

May 2011 by Vigil@nce

This bulletin was written by Vigil@nce : http://vigilance.fr/

SYNTHESIS OF THE VULNERABILITY

An attacker can invite the victim to display a malicious web
document, in order to create a Cross Site Scripting in web sites
developed with Ruby WEBrick.

Severity: 2/4

Creation date: 23/05/2011

IMPACTED PRODUCTS

 Fedora
 Mandriva Corporate
 Mandriva Enterprise Server
 Mandriva Linux
 Microsoft Windows - plateform
 Unix - plateform

DESCRIPTION OF THE VULNERABILITY

The WEBrick module is used to develop a web site in Ruby language.

The WEBrick httpresponse.rb file generates HTTP replies. However,
this module does not force the character encoding (Content-type:
text/html; charset=ISO-8859-1) in generated pages. An attacker can
thus use the vulnerability VIGILANCE-VUL-7812
(https://vigilance.fr/tree/1/7812) to inject data which are
interpreted as UTF-7 by Internet Explorer.

An attacker can therefore invite the victim to display a malicious
web document, in order to create a Cross Site Scripting in web
sites developed with Ruby WEBrick.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN
http://vigilance.fr/vulnerability/Ruby-Cross-Site-Scripting-via-WEBrick-10677


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