Chamilo 1.8.7 / Dokeos 1.8.6 – Remote File Disclosure - 体验盒子

作者： beford

日期： 2011-02-05

类别：

webapps

平台：

php

来源：https://www.exploit-db.com/exploits/16114/

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# Title: Chamilo 1.8.7 / Dokeos 1.8.6 Remote File Disclosure

# Date: 2011/01/31

# Author: beford

# Software Link: http://www.dokeos.com/download/dokeos-1.8.6.1.zip

# http://chamilo.googlecode.com/files/chamilo-1.8.7.1-stable.tar.gz

Affected products

=================

Dokeos 1.8.6.1 / 2.0

Chamilo 1.8.7.1

Resume

======

Two file disclosure flaws exists on these LMS platforms, which could

allow an attacker registered on the system to obtain files from the

server, i.e your database configuration file, or any other file

readeable by the webserver.

Details

=======

1) The user input to the $_GET['file'] variable was not been cleaned

at all, and used to open a file and send it to the browser of the

user, it only required to be registered and subscribed to a course:

POC:

http://lmscampus.tld/main/gradebook/open_document.php?file=../main/inc/conf/configuration.php

2) The user input on $_GET['doc_url'] was been checked for transversal

path injection attempts, however the filter is wrongly implemented,

and can be bypassed. Also other functions that should prevent this

behavior were not working properly.

When passing "..././" to the filter it replaces "../" first with "", that

leaves me with "../" which allows me to bypass it completly.

http://lmscampus.tld/main/document/download.php?doc_url=/..././..././..././main/inc/conf/configuration.php

Vendor notified: Jan 29/31, 2011

Vendor response Dokeos: none

Vendor response Chamilo: Patches developed and new version expected

around Feb 15