Month Of Abysssec Undisclosed Bugs - Cpanel PHP Restriction Bypass

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abysssec Inc Public Advisory  
  
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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