WordPress - "year" Cross-Site Scripting Vulnerability

Saturday, 17 March 2007

ChX Security |
Advisory #1 |
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-> "WordPress XSS under function wp_title()" <-

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Data |
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Author: g30rg3_x <g30rg3x_at_gmail_dot_com>
Program: WordPress <http://wordpress.org/>
Severity: Less Critical.
Type of Advisory: Mid Disclosure.
Affected/Tested Versions:
-> Series 2.0.x: <= 2.0.10-alpha
-> Series 2.1.x: <= 2.1.3-alpha
-> Series SVN latest: <= 2.2-bleeding (Revision 5002)

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Program Description |
====================
WordPress is a state-of-the-art semantic personal publishing platform
with a focus on aesthetics, web standards, and usability.
What a mouthful. WordPress is both free and priceless at the same time.
More simply, WordPress is what you use when you want to work with your
blogging software, not fight it.

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Overview |
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The query variable "year" inside the function "wp_title", its not sanitized
so it allows a non persistent cross site scripting attack.

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WorkAround |
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$title takes the value in raw (without any type of filter) of $year which is an
a query variable, that can be filled with any web browser via a simply GET parameter.

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Proof Of Concept|
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ChX Security will not release any proof of concept.

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Solution/Fix|
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The lastest SVN Revision (greater than revision 5002) has alredy fixed this bug...
http://trac.wordpress.org/changeset/5003

For series 2.1.x and 2.0.x, the vendor will fix this in the next set of dot releases.

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Dates |
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Bug Found: 2/03/2007
Vendor Contact: 3/03/2007
Vendor Response: 7/03/2007
Public Disclosure: 9/03/2007
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Shouts |
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Paisterist, NitRic, HaCkZaTaN, PescaoDeth, alex_hk23 and all mexican white hats.
White Hat Powa.

ChX Security
http://chxsecurity.org/
(c) 2007

Original Advisory:
http://chxsecurity.org/advisories/adv-1-mid.txt