[FD] CVE-2016-7981: SPIP 3.1.2 Reflected Cross-Site Scripting

## SPIP 3.1.2 Reflected Cross-Site Scripting (CVE-2016-7981) ### Product Description SPIP is a publishing system for the Internet, which put importance on collaborative working, multilingual environments and ease of use. It is free software, distributed under the GNU/GPL licence. ### Vulnerability Description The `var_url` parameter of the `valider_xml` file is not correctly sanitized and can be used to trigger a reflected XSS vulnerability. **Access Vector**: remote **Security Risk**: medium **Vulnerability**: CWE-79 **CVSS Base Score**: 6.8 (Medium) **CVE-ID**: CVE-2016-7981 ### Proof of Concept http://ift.tt/2dRnTrw ### Vulnerable code The `$url variable` is not properly sanitized in `valider_xml.php`, line 134 : $res = "

" . $err . "

" . "

" . $texte . '

'; $bandeau = "$url"; The Cross-Site Scripting vulnerability is triggered on line 146 : echo "

", $titre, '
', $bandeau, '

', ### Timeline (dd/mm/yyyy) * 15/09/2016 : Initial discovery * 26/09/2016 : Contact with SPIP Team * 27/09/2016 : Answer from SPIP Team, sent advisory details * 27/09/2016 : Incorrect fix from SPIP Team. * 27/09/2016 : New proof of concept for bypassing fixes for XSS sent. * 27/09/2016 : Fixes issued for XSS (23185). * 30/09/2016 : SPIP 3.1.3 Released ### Fixes * http://ift.tt/2dt1cMd * http://ift.tt/2d44Eun * http://ift.tt/2dt0zm9 ### Affected versions * Version <= 3.1.2 ### Credits * Nicolas CHATELAIN, Sysdream (n.chatelain -at- sysdream -dot- com)

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