Post Indexer 3.0.6.1 SQL Injection

2016.11.19
Credit: Glyn Wintle
Risk: Medium
Local: No
Remote: Yes
CVE: N/A
CWE: CWE-89

Details ================ Software: Post Indexer Version: 3.0.6.1 Homepage: http://premium.wpmudev.org/project/post-indexer/ Advisory report: https://security.dxw.com/advisories/sql-injection-in-post-indexer-allows-super-admins-to-read-the-contents-of-the-database/ CVE: Awaiting assignment CVSS: 4 (Medium; AV:N/AC:L/Au:S/C:P/I:N/A:N) Description ================ SQL Injection in Post Indexer allows super admins to read the contents of the database Vulnerability ================ Post Indexer does not use prepared queries in many cases and in some of its database calls it uses backticks (`). These are not automatically escaped by WordPress, thus leading to the possibility of SQLA injection. In other places in the code it simply takes user controlled values and adds them to SQLA queries. An example of this is remove_post_older_than: // classes/class.model.php line 589 function remove_posts_older_than( $unit, $period ) { // ... $sql = $this->db->prepare( \"SELECT BLOG_ID, ID FROM {$this->network_posts} WHERE DATE_ADD(post_date, INTERVAL %d \" . $period . \") < CURRENT_DATE() LIMIT %d\", $unit, PI_CRON_TIDY_DELETE_LIMIT ); $posts = $this->db->get_results( $sql ); // ... } The value of $period is user-controlled and could easily be replaced with SQL: // classes/cron.postindexerrebuild.php line 310 function process_tidy_agedposts($DEBUG = false) { // ... // The default is to remove posts from the index when they are over a year old $agedposts = get_site_option( \'postindexer_agedposts\', array( \'agedunit\' => 1, \'agedperiod\' => \'year\' ) ); // ... $this->model->remove_posts_older_than( $agedposts[\'agedunit\'], $agedposts[\'agedperiod\'] ); // ... } To exploit this vulnerability you need to be a super admin. Proof of concept ================ Mitigations ================ Upgrade to version 3.0.6.2 or later. Disclosure policy ================ dxw believes in responsible disclosure. Your attention is drawn to our disclosure policy: https://security.dxw.com/disclosure/ Please contact us on security@dxw.com to acknowledge this report if you received it via a third party (for example, plugins@wordpress.org) as they generally cannot communicate with us on your behalf. This vulnerability will be published if we do not receive a response to this report with 14 days. Timeline ================ 2016-11-01: Discovered 2016-11-14: Reported to plugin author viaA https://premium.wpmudev.org/contact/ 2016-11-14:A Plugin author responded 2016-11-17: Confirmed that version 3.0.6.2 fixes the issue 2016-11-17:A Requested CVE 2016-11-17:A Advisory published Discovered by dxw: ================ Glyn Wintle Please visit security.dxw.com for more information.


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