TITLE:
Mono ASP.NET Unicode Conversion Cross-Site Scripting

SECUNIA ADVISORY ID:
SA14325

VERIFY ADVISORY:
http://secunia.com/advisories/14325/

CRITICAL:
Less critical

IMPACT:
Cross Site Scripting

WHERE:
>From remote

SOFTWARE:
Mono 1.x
http://secunia.com/product/4673/

DESCRIPTION:
Andrey Rusyaev has discovered a vulnerability in Mono, which
potentially can be exploited by malicious people to conduct
cross-site scripting and script insertion attacks.

The vulnerability is caused due to an input validation error in the
sanitation of special HTML characters supplied as unicode characters
in the "Request Validation" security mechanism. This can e.g. be
exploited to execute arbitrary HTML and script code in a user's
browser session in context of a vulnerable site via a script
returning user input without sanitation.

This is similar to:
SA14214

Successful exploitation requires that the response encoding has been
set to a national ASCII codepage (not default setting).

The vulnerability has been confirmed in version 1.0.6 and has also
been reported in version 1.0.5. Other versions may also be affected.

SOLUTION:
Set the response encoding to unicode (default setting).

PROVIDED AND/OR DISCOVERED BY:
Andrey Rusyaev

ORIGINAL ADVISORY:
http://it-project.ru/andir/docs/aspxvuln/aspxvuln.en.xml

OTHER REFERENCES:
SA14214:
http://secunia.com/advisories/14214/

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