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:
