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Cpanel PHP Restriction Bypass Vulnerability 0day
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来源： http://www.abysssec.com 作者：shahin 发布时间：2010-09-02
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1) Advisory information
Title : Cpanel PHP Restriction Bypass Vulnerability
Version : <= 11.25
Discovery : http://www.abysssec.com
Vendor : http://www.cpanel.net
Impact : Ciritical
Contact : shahin [at] abysssec.com , info [at] abysssec.com
Twitter : @abysssec
2) Vulnerability Information
Class
1- Restriction Bypass Vulnerability
Impact
Attackers can use this issue to gain access to restricted files, potentially obtaining sensitive information that may aid in further attacks.It can help attacker to bypass restriction such as mod_security , Safemod and disable functions.
Remotely Exploitable
No
Locally Exploitable
Yes
3) Vulnerability details
1- Restriction Bypass Vulnerabilities:
Load All file with this structures :
[Domain | Filename ]
from :
/home/[user directory name/.fantasticodata/[Script name folder] and include all file.
Example [folder] :
/home/test/.fantasticodata/Joomla_1.5/
then include this file :
test.com|file1
After you created your malicious file in that style you can browse this page:
http://test.com:2082/frontend/x3/fantastico/autoinstallhome.php?app=Joomla_1.5
Now your PHP code will execute without /safe_mode/Disable_function/ Mod_security due to cpanel php.ini must be run with execute permission.
Vulnerable code located in in /usr/local/cpanel/3rdparty/fantastico/autoinstallhome.php :
Line 529 :
function Show_Notice ( $Script , $Version_Numbers )
{
$Home_Directory = $GLOBALS['enc_cpanel_homedir'] ;
if ( substr ( $Home_Directory , -1 ) != '/' )
{
$Home_Directory = $Home_Directory . '/' ;
}
$Files = Array ( ) ;
[This Place] ---> $Directory = $Home_Directory . '.fantasticodata/' . $Script . '/' ;
$Files = Get_Files ( $Directory ) ;
if ( !empty ( $Files ) AND is_array ( $Files ) )
{
$Temporary = natcasesort ( $Files ) ;
}
foreach ( $Files As $File )
{
$Name = '' ;
$Path = '' ;
if ( strstr ( $File , "|" ) )
{
$Name = explode ( "|" , $File ) ;
$Name = $Name[1] ;
}
else
{
$Name = $File ;
}
/* Debugging */ // echo $Directory . $File . '<br/>' ;
if ( is_file ( $Directory . $File ) )
{
include $Directory . $File ;
if ( !empty ( $thisscriptpath ) )
{
$Path = $thisscriptpath ;
}
else
{
$Path = $Home_Directory . 'public_html/' . $Name . '/' ;
}
if ( substr ( $Path , -1 ) != '/' )
{
$Path = $Path . '/' ;
}
/* Debugging */ // echo $Path . 'fantversion.php<br/><br/>' ;
if ( is_file ( $Path . 'fantversion.php' ) )
{
include $Path . 'fantversion.php' ;
if ( !empty ( $version ) )
{
if ( in_array ( $version , $Version_Numbers ) )
{
return 'Yes' ;
}
}
}
}
}
return 'No' ;
}
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