Description:
Claroline is a popular online Open Source e-Learning application used to allow
teachers or education organizations to create and administrate courses through
the web. Claroline is also used as the framework for other e-Learning applications
such as Dokeos. Unfortunately Claroline is vulnerable to a file inclusion issue
when register globals is on which may allow for an attacker to read or execute
arbitrary files. Some frameworks that use Claroline (such as Dokeos) are also
vulnerable to the issues mentioned here. An updated version of Claroline has been
released and users should upgrade immediately and disable register_globals if possible.
Arbitrary File Inclusion:
Claroline is vulnerable to an arbitray file inclusion issue that may allow for remote
code execution. The vulnerability is due to an uninitialized array being used to include
files. The vulnerable code in claro_init_local.inc.php can be seen below
if (isset($extAuthSource) && is_array($extAuthSource))
{
foreach($extAuthSource as $thisAuthSource)
{
$_uid = include_once($thisAuthSource['newUser']);
if ( $_uid > 0 )
{
$uidReset = true;
$claro_loginSucceeded = true;
break;
}
else
{
$_uid = null;
$claro_loginSucceeded = false;
}
}
} //end if is_array($extAuthSource)
Unfortunately there is no authentication needed to exploit this issue, thus allowing
an attacker to easily include files via the extAuthSource[newUser] variable.
Solution:
An updated version of Claroline has been released and users are encouraged to upgrade
as soon as possible.
Credits:
James Bercegay of the GulfTech Security Research Team
|
