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Security in PHP 那些在滲透測試的小技巧

Orange
August 21, 2024
21

Security in PHP 那些在滲透測試的小技巧

PHPConf Taiwan 2012

Orange

August 21, 2024
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  1. • aka Orange • 2009 • 2011 • 2011 AVTOKYO

    • – – Web Security – Windows Vulnerability Exploitation
  2. • Low – Sensitive Information Leakage… • Middle – Insecure

    File Download/Access… • High – Local File Inclusion, Code Injection, SQL Inj…
  3. 1. – system exec shell_exec popen eval create_function call_user_func preg_replace…

    2. – _GET _POST _COOKIE _REQUEST _ENV _FILES _SERVER HTTP_RAW_POST_DATA php://input getenv …
  4. • grep -Re – (include|require).+\$ – (eval|create_function|call_user_func|…).+\$ – (system|exec|shell_exec|passthru|…).+\$ –

    (select|insert|update|where|…).+\$ – (file_get_contents|readfile|fopen|…).+\$ – (unserialize|parse_str|…).+\$ – \$\$, $a\(\) – ……
  5. try { …… $trans->commit(); } catch (xxx_adapter_exception $e) { $trans->rollback();

    require_once 'xxx_exceptio$n.class.php' throw new xxx_exception( …… ); }
  6. <?php $name = $_GET['name']; $name = basename( $name ); if

    ( eregi( "(.php|.conf)$", $name ) ) exit( "Not Allow PHP." ); else readfile( DOCUMENT_ROOT. $name ); ?>
  7. • down.php?name= – config.php – config"php – config.ph> – config.<

    – c>>>>>"< – c<"< Test on PHP 5.4.8 newest stable version (2012/10/17) Original Will be replaced by < * > ? " .
  8. • file_get_contents – > php_stream_open_wrapper_ex – > zend_resolve_path – >

    php_resolve_path_for_zend – > php_resolve_path – > tsrm_realpath – > virtual_file_ex – > tsrm_realpath_r
  9. • file_get_contents • file_put_contents • file • readfile • phar_file_get_contents

    • include • include_once • require • require_once • fopen • opendir • readdir • mkdir • ……
  10. • Web Browser PHP Output (HTML) – Cross-Site Scripting •

    DB Management PHP Output (SQL) – SQL Injection
  11. Σ( ° △ °|||)︴ Before After PHPCONF PHPCONF PHPCONF' PHPCONF\'

    PHPCONF%80' PHPCONF�\' PHPCONF%cc' PHPCONF岤' 0x81-0xFE 0x40-0x7E 0xA1-0xFE
  12. • $url = "http://phpconf.tw/2012/"; • $url = "http://phpconf.tw/$year/"; • $url

    = "http://phpconf.tw/{$year}/"; • $url = "http://phpconf.tw/{${phpinfo()}}/"; • $url = "http://phpconf.tw/${@phpinfo()}/";
  13. • PHP Security – http://blog.php-security.org/ • Oddities of PHP file

    access in Windows®. – http://onsec.ru/onsec.whitepaper-02.eng.pdf