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TITLE:
Ruby on Rails Unicode Input Cross-Site Scripting Vulnerability

SECUNIA ADVISORY ID:
SA36600

VERIFY ADVISORY:
http://secunia.com/advisories/36600/

DESCRIPTION:
A vulnerability has been reported in Ruby on Rails, which can be
exploited by malicious people to conduct cross-site scripting and
potentially script insertion attacks.

Certain specially crafted unicode input is not properly sanitised
before being used. This can be exploited to e.g. execute arbitrary
HTML and script code in a user's browser session in context of an
affected site.

The vulnerability is reported in all 2.x versions prior to 2.2.3 and
2.3.4.

Note: Additionally, a potential timing issue due to the use of a
non-constant time algorithm in the cookie store has been reported.

SOLUTION:
Update to version 2.2.3 or 2.3.4.

PROVIDED AND/OR DISCOVERED BY:
The vendor credits Brian Mastenbrook.

ORIGINAL ADVISORY:
http://weblog.rubyonrails.org/2009/9/4/xss-vulnerability-in-ruby-on-rails
http://weblog.rubyonrails.org/2009/9/4/timing-weakness-in-ruby-on-rails

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