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TITLE:
HTML Purifier CSS Cross-Site Scripting and Script Insertion

SECUNIA ADVISORY ID:
SA30779

VERIFY ADVISORY:
http://secunia.com/advisories/30779/

CRITICAL:
Moderately critical

IMPACT:
Cross Site Scripting

WHERE:
>From remote

SOFTWARE:
HTML Purifier 2.x
http://secunia.com/product/19145/
HTML Purifier 3.x
http://secunia.com/product/19146/

DESCRIPTION:
Two vulnerabilities have been reported in HTML Purifier, which can be
exploited by malicious people to conduct cross-site scripting or
script insertion attacks.

Input passed to the library containing CSS data is not properly
sanitised before being used. This can be exploited to insert
arbitrary HTML and script code, which will be executed in a user's
browser session in context of an affected site when the malicious
data is viewed.

Successful exploitation of one of the vulnerabilities requires that
the output encoding is set to Shift_JIS.

The vulnerabilities are reported in all versions prior to 2.1.5 and
3.1.1.

SOLUTION:
Update to version 2.1.5 or 3.1.1.

PROVIDED AND/OR DISCOVERED BY:
Reported by the vendor.

ORIGINAL ADVISORY:
http://htmlpurifier.org/news.html

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About:
This Advisory was delivered by Secunia as a free service to help
everybody keeping their systems up to date against the latest
vulnerabilities.

Subscribe:
http://secunia.com/secunia_security_advisories/

Definitions: (Criticality, Where etc.)
http://secunia.com/about_secunia_advisories/


Please Note:
Secunia recommends that you verify all advisories you receive by
clicking the link.
Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.

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