Cpanel PHP – Restriction Bypass
''' __ __ ____ _ _ ____ | \/ |/ __ \ /\ | | | | _ \ | \ / | | | | / \ | | | | |_) | | |\/| | | | |/ /\ \| | | | _ < Day 1 (0day) | | | | |__| / ____ \ |__| | |_) | |_| |_|\____/_/ \_\____/|____/ ''' 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' ; } |